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DR. PAKORN OPAPRAKASIT (ASSOCIATE PROFESSOR)
Faculty
:
School of Bio-Chemical Engineering and Technology (BCET)
Name
:
Dr. Pakorn Opaprakasit (Associate Professor)
Position
:
Head, Department of Common and Graduate Studies
E - Mail
:
pakornsiit.tu.ac.th
Phone Rangsit
:
+66-2-986-9009, +66-2-986-9101, +66-2-564-3226
Phone Bangkadi
:
Phone Extension
:
1806
  Education
  • B.Sc. (1st Class Honors) in Chemistry, Chiang Mai University, Thailand
  • M.S. in Materials Science and Engineering (Polymer Option), The Pennsylvania State University,Pennsylvania, USA
  • Ph.D. in Materials Science and Engineering, the Pennsylvania State University, Pennsylvania, USA
  Academic Awards
  • Young Researcher Award, Thammasat University, 2008.
  • Gold Medal Prize, 1997, Chiang Mai University, Thailand.
  • Gold Medal Prize, 1997, The Thab Foundation, Chulalongkorn University, Thailand.
  • Development and Promotion of Science and Technology Talents Project (DPST) Scholarship, 1990-2003.
  Research Areas

Infrared spectroscopy, Electrospining, Lactide-based polyesters, Biocompatible/degradable polymers, Natural rubber, Biomedical materials, Biodiesel, Sensors

  Research Interests

Lactide-based (biocompatible/degradable) Polyesters

Polylactide (PLA) is an aliphatic polyester that is of interest in various applications, due to its biodegradability, biocompatibility, and renewable monomer resources. In addition, properties of this polymer can be modified for use in specific applications by copolymerization or blending with other polymers. In our lab, various lactide-based copolymers have been synthesized, e.g., poly(D-lactide), poly(L-lactide), poly(DL-lactide), poly(lactide-co-ethylene glycol), poly(lactide-co-glycidol), poly(lactide-co-ethylene terephthalate). The copolymers are then used in various applications, for example, as fertilizer controlled-release materials, packaging materials, and in biomedical, environmental and energy applications. Micro- and nanoencapsulation techniques and electrospinning methods are employed in the preparation of the materials.

Conventional and Two-Dimensional FTIR Spectroscopy

Infrared spectroscopy is a fundamental analytical technique that is widely used in material characterization. Recently, an advanced methodology, two-dimensional infrared spectroscopy (2D-FTIR) has been developed, which provides notable advantages over conventional FTIR. For example, an improvement in band resolution, simplicity in band assignment, and determination of relative order of responses of specific functional groups to external perturbation, have been achieved. The FTIR and 2D-FTIR techniques have been applied in characterizations of various materials, e.g., polymers, fuels, and minerals.

  Work Experiences
  • 2004-Present: SIIT
  • 2003-2004: Consultant in Coal Characterization
  • 2003-2004: Postdoctoral Fellow, Department of Materials Science and Engineering, The Pennsylvania State University, Pennsylvania, USA
  • 1998-2002: Research and Teaching Assistant, The Energy Institute, The Pennsylvania State University, Pennsylvania, USA
  List of Publications

International Journal Articles

  1. Le G. T. T., Manyam J., Opaprakasit P., Chanlek N., Grisdanurak N., and Sreearunothai P., Divergent mechanisms for thermal reduction of graphene oxide and their highly different ion affinities, 2018, 89, 246-256.
  2. Rahman M., and Opaprakasit P., Effects of UV/photo-initiator treatments on enhancement of crystallinity of polylactide films and their physicochemical properties, Journal of Polymers and the Environment, 2018, 26: (7), 2793-2802.
  3. Torpanyacharn O., Sukpuang P., Petchsuk A., Opaprakasit P., and Opaprakasit M., Curable precursors derived from chemical recycling of poly(ethylene terephthalate) and polylactic acid and physical properties of their thermosetting (co)polyesters, Polymer Bulletin, 2018, 75: (1), 395-414.
  4. Thitisomboon W., Opaprakasit P., Jaikaew N., and Boonyarattanakalin S., Characterizations of modified cassava starch with long chain fatty acid chlorides obtained from esterification under low reaction temperature and its PLA blending, Journal of Macromolecular Science, Part A: Pure and Applied Chemistry,  2018, 55: (3), 253–259.
  5. Nim B., Sreearunothai P., Petchsuk A., and Opaprakasit P. Preparation of TiO2-loaded electrospun fibers of polylactide/poly(vinylpyrrolidone) blends for use as catalysts in epoxidation of unsaturated oils, Journal of Nanoparticle Research, 2018, 20: (4), 15 p.
  6. Rahman M., and Opaprakasit P., Quantitative analysis of polyacrylamide grafted on polylactide film surfaces employing spectroscopic techniques, Applied Spectroscopy, 2017, 71: (11), 2457-2468.
  7. Rahman, M., Sreearunothai P., and Opaprakasit P., Development and characterization of photoinduced acrylamide-grafted polylactide films for biomedical applications, International Journal of Polymer Science, 2017, 2017, 11 p.
  8. Kaewmee P., Manyam J., Opaprakasit P., Thi Truc Le G., Chanlekc N., and Sreearunothai P., Effective removal of cesium by pristine graphene oxide: performance, characterizations and mechanisms, RSC Advances, 2017, 7: (61), 38747-38756.
  9. Sukpuang P., Opaprakasit M., Petchsuk A., Tangboriboonrat P., Sojikul P., and Opaprakasit P., Polylactic acid glycolysate as a cross-linker for epoxidized natural rubber: effect of cross-linker molecular weight, Journal of Elastomers and Plastics, 2016, 48: (2), 105-121.
  10. Chantarodsakun T., Vongsetskul T., Jangpatarapongsa K., Tuchinda P., Uamsiri S., Bamrungcharoen C., Kumkate S.,Opaprakasit P., and Tangboriboonrat P., [6]-Gingerol-loaded cellulose acetate electrospun fibers as a topical carrier for controlled release, Polymer Bulletin, 2014, 71: (12), 3163-3176.
  11. Thammawong C., Buchatip S., Petchsuk A., Tangboribbonrat P., Chanunpanich N., Opaprakasit M., Sreearunothai P., and Opaprakasit P., Electrospinning of Poly(L-lactide-co-DL-lactide) copolymers: effect of chemical structures and spinning conditions, Polymer Engineering and Science, 2014, 54: (2), 472-480.
  12. Sriromreun P., Petchsuk A., Opaprakasit M., and Opaprakasit P., Miscibility and hydrolytic degradability of polylactic acid/poly (ethylene terephthalate-co-lactic acid) blends, Chiang Mai Journal of Science, 2014, 41: (3), 691-703.
  13. Petchsuk A., Buchatip S., Supmak W., Opaprakasit M., and Opaprakasit P., Preparation and properties of multi-branched poly(D-lactide) derived from polyglycidol and its stereocomplex blends, Express Polymer Letters, 2014, 8: (10), 779-789.
  14. Nuasaen S., Opaprakasit P., and Tangboriboonrat P., Hollow latex particles functionalized with chitosan for the removal of formaldehyde from indoor air, Carbohydrate Polymers, 2014, 101, 179-187.
  15. Petchsuk A., Submark W., and Opaprakasit P., Development of crosslinkable poly(lactic acid-co-glycidyl methacrylate) copolymers and their curing behaviors, Polymer Journal, 2013, 45: (4), 406-412.
  16. Tounthai J., Petchsuk A., Opaprakasit P., and Opaprakasit M., Curable polyester precursors form polylactic acid glycolyzed products, Polymer Bulletin, 2013, 70: (8), 2223-2238.
  17. Thammawong C., Opaprakasit P., Tangboriboonrat P., and Sreearunothai P., Prussian blue-coated magnetic nanoparticles for removal of cesium from contaminated environment, Journal of Nanoparticle Research, 2013, 15: ( 6), Article No. 1691, 10 p.
  18. Sriromreun P., Petchsuk A., Opaprakasit M., and Opaprakasit P., Standard methods for characterizations of structure and hydrolytic degradation of aliphatic/aromatic copolyesters, Polymer Degradation and Stability, 2013, 98: (1) 169-176.
  19. Thammawong C., Sriarunothai P., Petchsuk A., Tangboriboonrat P., Pimpha N., and Opaprakasit P., Preparation and characterizations of naproxen-loaded magnetic nanoparticles coated with PLA-g-chitosan, Journal of Nanoparticle Research, 2012, 14: (8) Article No. 1046, 12 p.
  20. Kaewsaneha C., Opaprakasit P., Polpanich D., Smanmoo S., and Tangboriboonrat P., Immobilization of fluorescein isothiocyanate on magnetic polymeric nanoparticle using chitosan as spacer, Journal of Colloid and Interface Science,2012, 377: (1) 145-152.
  21. T.-H. Nguyen; P. Tangboriboonrat; N. Rattanasom; A. Petchsuk; M. Opaprakasit; C. Thammawong and P. Opaprakasit, Polylactic acid/ethylene glycol triblock copolymer as novel crosslinker for epoxidized natural rubber,Journal of Applied Polymer Science, 2012, 124: (1), 164-174.
  22. Tanpantree, S., Opaprakasit, P., Polpanich, D., Smanmoo, S., and Tangboriboonrat, P., Polymeric Disinfectant Nanocapsules: Effect of Molecular Weight of Poly(methyl acrylate), Journal of Biomedical Nanotechnology, 2010, 6: (4) 1-6.
  23. Kaewsaneha C., Opaprakasit P., Polpanich D., Smanmoo S., and Tangboriboonrat P., Composite Particles of Disinfectant Nanocapsules-skim Rubber Latex, International Journal of Polymer Analysis and Characterization, 2010, 15: (8) 524-535.
  24. Namkajorn M., Petchsuk A., Opaprakasit M., and Opaprakasit P., Synthesis and Characterizations of Degradable Aliphatic-aromatic Copolyesters from Lactic Acid, Dimethyl Terephthalate and Diol: Effects of Diol Type and Monomer Feed Ratio, eXPRESS Polymer Letters, 2010, 4: (7) 415-422.
  25. Nguyen T.H., Petchsuk A., Tangboriboonrat P., Opaprakasit M., Sharp A., and Opaprakasit P., Synthesis and Characterizations of PLLA/PEG Block Copolymers, Advanced Materials Research, 2010, 93-94: 198-201.
  26. Tanpantree S., Opaprakasit P., Loykulnant S., Kangwansupamonkon W., Tangboriboonrat P., Nanocapsules Embedded in Natural Rubber Latex Gloves, Journal of Applied Polymer Science, 2010, 117: (3) 1798-1803.
  27. Opaprakasit M., Petchsuk A., Opaprakasit P., Chongprakobkit, S., Effects of Synthesis Conditions on Chemical Structures and Physical Properties of Copolyesters from Lactic Acid, Ethylene Glycol and Dimethyl Terephthalate,Express Polymer Letters, 2009, 3: (7) 458-468.
  28. Namkajorn M., Petchsuk A., Opaprakasit M., and Opaprakasit P., Synthesis and Characterization of PLA-Based Aliphatic-Aromatic Copolyesters: Effect of Diols, Advanced Materials Research, 2008, 55-57: 785-788.
  29. Sriromreun P., Opaprakasit M., Petchsuk A., and Opaprakasit P., Synthesis and Characterization Degradable Poly(Ethylene Terephthalate-Co-Lactic Acid) and Its Blends, Advanced Materials Research, 2008, 55-57: 789-792.
  30. Thammawong C., Thongkhong K., Iamtassana K., Sharp A., and Opaprakasit P., Production and Characterization of Polyhydroxyalkanoates (PHAs) from Inexpensive Substrates by Alcaligenes latus, Advanced Materials Research, 2008, 55-57: 893-896.
  31. Papangkorn J., Isaraphan C., Phinhongthong S., Opaprakasit M., and Opaprakasit P., Controlled- Release Material for Urea Fertilizer from Polylactic Acid, Advanced Materials Research, 2008, 55-57: 897-900.
  32. Jintakanon N., Opaprakasit P., Petchsuk A., and Opaprakasit M., Controlled-Release Materials for Fertilizer Based on Lactic Acid Polymers, Advanced Materials Research, 2008, 55-57: 905-908.
  33. Opaprakasit P. and Opaprakasit M., Thermal Properties and Crystallization Behaviors of Polylactide and Its Enantiomeric Blends, Macromolecular Symposia  (Special Issue: Advances in Petrochemicals and Polymers), 2008, 264: (1) 113-120.
  34. Opaprakasit P., Opaprakasit M., and Tangboriboonrat P., Crystallization of Polylactide and Its Stereocomplex Investigated by Two-Dimensional Fourier Transform Infrared Correlation Spectroscopy Employing Carbonyl Overtones, Applied Spectroscopy, 2007, 61: (12) 1352-1358.
  35. Larsen J.W., Islas-Flores C., Aida M.T., Opaprakasit P., Painter P.C., Low Temperature Anhydride Formation in Kerogens, Energy & Fuels, 2005, 19: 145-151.
  36. Opaprakasit P., Painter, P.C., Swelling of Clays in N-Methyl-2-Pyrrolidinone/Carbon Disulfide Mixed Solvents, Energy & Fuels, 2004, 18: 1704-1708.
  37. Opaprakasit P., Painter, P.C., Determination of the Glass Transition Temperature of a Coal Extract, Using a Polymer Blend Methodology,  Energy & Fuels, 2004, 18, 1648-1655.
  38. Opaprakasit, P.; and Painter, P.C., Concerning the Glass Transition Temperature of Coal, Energy & Fuels, 2003, 17, 354-358.
  39. Opaprakasit, P.; Scaroni, A.W.; and Painter, P.C., Ionomer-Like Structures and π-Cation Interactions in Argonne Premium Coals, Energy & Fuels, 2002, 16, 543-551.
  40. Opaprakasit, P.; Scaroni, A.W.; and Painter, P.C., Intramolecular Hydrogen Bonding and Calixarene-Like Structures in p-Cresol/ Formaldehyde Resins, J. Mol. Structure,  2001, 570, 25-35.
  41. Painter, P.C.; Opaprakasit, P.; and Scaroni, A.W., Ionomers and the Structure of Coal, Energy & Fuels, 2000, 14, 1115- 118.

National Journal Article

  1. Tippo N., Manyam J., Yoosuk B., Opaprakasit P., and Sreearunothai P., Slow release of menthol using sorbents developed from microwave graphene oxide, King Mongkuts University of Technology North Bangkok International Journal of Applied Science and Technology, 2017, 10: (1), 71–76.
  2. Opaprakasit P., Petchsuk A., Painter P.C., Malkov S., Dynamic 2D-FTIR Spectroscopic Studies of Poly(Vinylidine Fluoride/Trifluoroethylene/Chloro trifluoroethylene), P (VDF/TrFE/CTFE) Terpolymer, Journal of the Science Faculty of Chiang Mai University,  2005, 32, 515-519.


International Conference Proceedings

  1. Naksin N., Sombatmankhong K., Opaprakasit P., Chooaksom W., Pathumrangsan N., and Sreearunothai P., Development of low-cost hydrophobic sachet for storage of ethylene scavenger for use in extending fruit shelf life, Proceedings of the 8th International Polymer Conference of Thailand 2018 (PCT-8), Bangkok, Thailand, 14-15 June 2018.
  2. Lam K., Manyam J., Tansarawiput C., Opaprakasit P., and Sreearunothai P., Development of infrared-reducing coating from poly(3 *4-ethylenedioxythiophene) polystyrene sulfonate, Proceedings of the 8th International Polymer Conference of Thailand 2018 (PCT-8), Bangkok, Thailand, 14-15 June 2018.
  3. Chuensukum V., Boondamnoen O., Opaprakasit P., Petchsuk A., and Opaprakasit M., Styrene/stearyl methacrylate foams as oil absorbent, Proceedings of the Pure and Applied Chemistry International Conference 2018 (PACCON2018), Songkhla, Thailand, 7-9 February 2018.
  4. Chupong S., Opaprakasit P., and Kaseamwong K., Optimization of extraction condition of microcrystalline cellulose from rice bran residue, Proceedings of the Pure and Applied Chemistry International Conference 2018 (PACCON2018), Songkhla, Thailand, 7-9 February 2018.
  5. Tubthong T., Wisitsoraat A., Tansarawiput C., Opaprakasit P., and Sreearunothai P., Development of ammonia gas sensor based on Ni-doped reduce graphene oxide, Proceedings of the 4th International Conference on Engineering, Applied Sciences and Technology (ICEAST 2018), Phuket, Thailand, 4-7 July 2018.
  6. Suwanphithak B., Kasemwong K., Opaprakasit P., and Sreearunothai P., Synthesis and characterization of magnetic nanoparticlegraphene oxide composites using coprecipitation and solvothermal processes for cation removal, Proceedings of the 13th Asian Congress on Biotechnology 2017 (ACB 2017), Khon Kaen, Thailand, 23-27 July 2017.
  7. Bunthoeun N., Sreearunothai P., Onjun T., and Opaprakasit P., Property modifications of polylactide/polyvinylpyrrolidone blends loaded with TiO2 by dielectric barrier discharge (DBD) plasma treatment, Proceedings of the Pure and Applied Chemistry International Conference 2017 (PACCON2017), Bangkok, Thailand, 2-3 February 2017.
  8. Sriwongsa S., Manyam J., Opaprakasit P., and Sreearunothai P., Electrospun nanofiber of poly-L-lactic acid (PLLA)/graphene oxide (GO) blends, Proceedings of the 7th International Polymer Conference of Thailand 2017 (PCT-7), Bangkok Thailand, 1-2 June 2017.
  9. Koonawat S., Opaprakasit M., Petchsuk A., and Opaprakasit P., Chemical recycling of degradable poly(lactic acid) employing alcoholysis reaction of glycerol, Proceedings of the Pure and Applied Chemistry International Conference 2017 (PACCON2017), Bangkok, Thailand, 2-3 February 2017.
  10. Mongkhonnithet K., Opaprakasit P., Petchsuk A., and Chaysuwan D., Development of poly(lactic acid - glycidyl methacrylate - glycidyltrimethyl ammonium chloride) terpolymer for biomedical applications, Proceedings of the Pure and Applied Chemistry International Conference 2017 (PACCON2017), Bangkok, Thailand, 2-3 February 2017.
  11. Sriprasert N., Chaiyasat P., Chaiyasat A., Opaprakasit M., Petchsuk A., and Opaprakasit P., Development of poly(methyl methacrylate) products with superhydrophobic surfaces, Proceedings of the 7th International Polymer Conference of Thailand 2017 (PCT-7), Bangkok Thailand, 1-2 June 2017.
  12. Anilabol P., Wichitamornloe A., Opaprakasit P., and Opaprakasit M., Effects of polyethylene types on properties of polypropylene/polyethylene blends, Proceedings of the Pure and Applied Chemistry International Conference 2017 (PACCON2017), Bangkok, Thailand, 2-3 February 2017.
  13. Sdok S., Petchsuk A., and Opaprakasit P., Electrospun nanofibers of polylactide (PLA)/ polyglutamic acid (γ-PGA) blends and their use as ammonia detecting kits in intelligent meat packaging, Proceedings of the Pure and Applied Chemistry International Conference 2017 (PACCON2017), Bangkok, Thailand, 2-3 February 2017.
  14. Supmak W., Petchsuk A., and Opaprakasit P., Kinetics and mechanisms of thermo curing reaction of poly(lactic acid-co-glycidyl methacrylate): DSC and FTIR analyses, Proceedings of the Pure and Applied Chemistry International Conference 2017 (PACCON2017), Bangkok, Thailand, 2-3 February 2017.
  15. Jongmanwattana N., Kasemwong K., Chanunpanich N., and Opaprakasit P., Preparation of electrospun polylactide/quaternized cellulose composite nanofibers for biomedical applications, Proceedings of the 6th International Polymer Conference of Thailand 2016 (PCT-6), Bangkok, Thailand, 30 June - 1 July 2016.
  16. Rahman M., Petchsuk A., and Opaprakasit P., UV-assisted synthesis of poly(L-lactide-I-glycidyl methacrylate-graft-acrylamide) for use in biomedical and environmental applications, Proceedings of the 6th International Polymer Conference of Thailand 2016 (PCT-6), Bangkok, Thailand, 30 June - 1 July 2016.
  17. Kaewmee P., Manyam J., Munasinghe H.A.H.M., Opaprakasit P., and Sreearunothai P. Synthesis of graphene oxides and its cesium sorption performance, Proceedings of the 2nd International Conference on Engineering Science and Innovative Technology (ESIT2016), Phuket, Thailand, April 21-23, 2016.
  18. Jaikaew A., Petchsuk A., Opaprakasit M., and Opaprakasit P. Development of glycolysis process for chemical recycling of polylactic acid employing Fe3O4 nanoparticle catalyst and microwave irradiation, Proceedings of the Pure and Applied Chemistry International Conference 2016 (PACCON 2016), Bangkok, Thailand, February 9-11, 2016.
  19. Sriromreun P., Petchsuk A., Opaprakasit M., and Opaprakasit P. Synthesis and characterization of poly (butanediol terephthalate-co-lactic acid) (PBDT-co-PLA) copolymer, Proceedings of the 4th Annual Conference on Engineering and Information Technology (ACEAIT 2016), Kyoto, Japan, March 29-31, 2016.
  20. Deesaen P., Opaprakasit P., Manyam J., Egashira R., and Sreearunothai P. Effect of synthesis time and crystallinity on the Ni(II) sorption performance of zeolite-like titanosilicate compounds, Proceedings of the IRES 7th International Conference, 2015, 7-11: The 4th International Academic Conference on Engineering, Technology and Innovations (IACETI-2015), Kuala Lumpur, Malaysia, 2015, August 16, 2015.
  21. Moonkambil W., Opaprakasit P., Sumranjit J.; and Sreearunothai P. Synthesis and characterization of titanosilicate compounds for Pb (II) removal, Proceedings of the IRES 7th International Conference, 2015, 1-6: The 4th International Academic Conference on Engineering, Technology and Innovations (IACETI-2015), Kuala Lumpur, Malaysia, 2015, August 16, 2015.
  22. Boonsod T., Sreearunothai P., and Opaprakasit P. Analysis of free fatty acids contents in palm oil samples employing 1,1-carbonyldiimidazole reagent and a portable infrared spectrometer, Proceedings of Burapha University International Conference 2015 (BUU 2015), Chon Buri, Thailand, July 10-12, 2015.
  23. Opaprakasit P., Boonpa S., Jaikaew N., Petchsuk, A., and Tangboriboonrat P. Preparation of surface-modified silica particles from rice husk ash and its composites with degradable polylactic acid, Macromolecular Symposia, 354 (1), 48-54: Proceedings of World Polymer Congress - MACRO 2014, Chiang Mai, Thailand, July 6-11, 2014.
  24. Masae R., Opaprakasit P., Petchsuk A., Polpanich D., Sreearunothai P., Removal of free-fatty acid from waste cooking oils using iron oxide magnetic nanoparticles for use in biodiesel production, Proceedings of the Pure and Applied Chemistry International Conference 2014 (PACCON2014), Khon Kaen, Thailand, January 8-10, 2014.
  25. Nalakarn P., Masae R., Opaprakasit P., Sreearunothai P., Synthesis and characterization of sodium-titanosilicate coated magnetic particles for removal of cesium from contaminated water. Proceedings of the Pure and Applied Chemistry International Conference 2014 (PACCON2014), Khon Kaen, Thailand, January 8-10, 2014.
  26. Sukpuang P., Opaprakasit M., Petchsuk A., Opaprakasit P., Toughness enhancement of polylactic acid by employing glycolyzed polylactic acid-cured epoxidized natural rubber, Advanced Materials Research, 1025-1026, 580-584: The 2014 International Conference on Advanced Materials, Structures and Mechanical Engineering (ICAMSME 2014), Incheon, South Korea, May 3-4, 2014.
  27. Somboonchai S., Opaprakasit P., Pattamaprom C., Value adding of skim natural rubber by grafting with maleic anhydride, Advanced Materials Research, 844, 41-44: the 1st Asia Pacific Rubber Conference 2013 (APRC-2013), Surat Thani, Thailand, September 5-6, 2013.
  28. Pranee S., Petchsuk A., Opaprakasit P., Opaprakasit M., Synthesis of lactic acid-based block copolymer via atom transfer radical polymerization (ATRP), Proceedings of Pure and Applied Chemistry International Conference 2013(PACCON2013), Chon Buri, Thailand, January 23-25, 2013.
  29. Chuenta T., Petchsuk A., Opaprakasit P., Opaprakasit M., Toughening of poly(lactic acid) by reactive blending with hyper-branched poly(lactic acid-co-caprolactone), Proceedings of Pure and Applied Chemistry International Conference 2013 (PACCON2013), Chon Buri, Thailand, January 23-25, 2013.
  30. Sriromreun P., Petchsuk A., Opaprakasit M., and Opaprakasit P., Properties and degradability of poly(propylene terephthalate-co-lactic acid) blends, Proceedings of the 2nd International Conference on Engineering and Applied Science (2013 ICEAS) [CD-ROM], Tokyo, Japan, March 15-17, 2013.
  31. Sriromreun P., Petchsuk A., Opaprakasit M., and Opaprakasit P., Synthesis and characterizations of poly(propylene terephthalate-co-lactic acid) copolymer, Proceedings of the 6th Pure and Applied Chemistry International Conference 2012 (PACCON 2012) [CD-ROM], Chiang Mai, Thailand, January 11-13, 2012.
  32. W. Supmak; A. Petchsuk; P. Opaprakasit; and W. Siriwatwechakul, Synthesis and characterizations of functionalized polylactic acid copolymers, World Academy of Science, Engineering and Technology, 2012, 65: 1380-1383. (Originally presented in the XXXII International Conference on Finance and Business Economics (ICFBE 2012), 29-30 May 2012, Tokyo, Japan.)
  33. Nakruangsri N., Sukpuang P., Petchsuk A., Opaprakasit P. and Opaprakasit M. Glycolysis Reaction as a Chemical Recycling Process for Poly(lactic acid), Proceedings of the 2nd International Conference on Green and Sustainable Innovation (ICGSI 2009) [CD-ROM], Chiang Rai, Thailand, December 2-4, 2009.
  34. Sriromreun P., Petchsuk A., Opaprakasit M. and Opaprakasit P. Miscibility and Hydrolytic Degradability of Poly(Ethylene Terephthalate-co-Lactic Acid) (PET-co-PLA)/Poly(butylene succinate) (PBS) Blends, Proceedings of the 2nd International Conference on Green and Sustainable Innovation (ICGSI 2009) [CD-ROM], Chiang Rai, Thailand, December 2-4, 2009.
  35. Sukpuang P., Petchsuk A., Opaprakasit P. and Opaprakasit M. Lactic Acid-Ethylene Terephthalate Copolymers from Glycolyzed Products: Synthesis and Characterizations, Proceedings of the 2nd International Conference on Green and Sustainable Innovation (ICGSI 2009) [CD-ROM], Chiang Rai, Thailand, December 2-4, 2009.
  36. Supmak W., Petchsuk A., Opaprakasit P., Sharp A. and Siriwatwechakul W. Synthesis and Characterizations of Copolymers of Lactide and Glycidyl Methacrylate: Effects of Synthesis Conditions, Proceedings of the 2nd International Conference on Green and Sustainable Innovation (ICGSI 2009) [CD-ROM], Chiang Rai, Thailand, December 2-4,2009.
  37. Kitsatienkun S., Laoratanakul P. and Opaprakasit P. Removal of Heavy Metals from Wastewater by Chitosan Composite Biosorbent: Adsorption Mechanisms, Proceedings of the World Renewable Energy Congress 2009 – Asia: The 3rd International Conference on Sustainable Energy and Environment (SEE 2009) [CD-ROM], Bangkok, Thailand, May 19-22, 2009, 1275-1280.
  38. Kordach A., Petchsuk A., Opaprakasit M. and Opaprakasit P. Preparation and Characterization of Controlled-Release Materials for Urea Fertilizer from Poly(Lactic Acid). Proceedings of the World Renewable Energy Congress 2009 – Asia: The 3rd International Conference on Sustainable Energy and Environment (SEE 2009) [CD-ROM], Bangkok, Thailand, May 19-22, 2009, 1281-1286.
  39. Kitsatienkun S., Laoratanakul P. and Opaprakasit P. Chitosan-coated Alumina as Cr(VI) Removal Materials.Proceedings of the Pure and Applied Chemistry International Conference (PACCON 2009), Phitsanulok, Thailand, January 14-16, 2009, 156-159.
  40. Kordach A., Petchsuk A., Opaprakasit M. and Opaprakasit P. Preparation and Properties of Controlled-release Materials for Urea Fertilizer from Copolyester and Its Blends. Proceedings of the Pure and Applied Chemistry International Conference (PACCON 2009), Phitsanulok, Thailand, January 14-16, 2009, 178-181.
  41. Sriromreun P., Petchsuk A., Opaprakasit M., Tangboriboonrat P. and Opaprakasit P. Properties and Degradability of Poly(Ethylene Terephthalate-co-Lactic Acid) Copolymer and Its Blends. Proceedings of the Pure and Applied Chemistry International Conference (PACCON 2009), Phitsanulok, Thailand, January 14-16, 2009, 570-573.
  42. Sukpuang P., Petchsuk A., Opaprakasit P. and Opaprakasit M. Synthesis and Characterizations of Poly(Lactic Acid-co-Ethylene Terephthalate) from Glycolysed Products. Proceedings of the Pure and Applied Chemistry International Conference (PACCON 2009), Phitsanulok, Thailand, January 14-16, 2009, 582-585.
  43. Opaprakasit P. andLawtrakul L. Intra-molecular Hydrogen Bonding in Calixarene-like Structures of Phenolic Resins: Phenolic Analogue Models, Proceedings of Pure and Applied Chemistry International Conference 2008 (PACCON 2008) [CD-ROM], Bangkok, Thailand, January 30 – February 1, 2008, 675-680.
  44. Phattanaphibul T., Opaprakasit P., Koomsap P., and Tangwarodomnukun V., Preparing Biodegradable PLA for Powder-Based Rapid Prototyping, Proceedings of the 8th Asia Pacific Industrial Engineering & Management System and 2007 Chinese Institute of Industrial Engineers Conference (APIEMS & CIIE2007) [CD-ROM}, Kaohsiung, Taiwan, December 9- 12, 2007.
  45. Tangwarodomnukun V., Koomsap P., Opaprakasit P., and Phattanaphibul T., Coloring Polylactide Powder for Multicolor Rapid Prototyping, Proceedings of the 8th Asia Pacific Industrial Engineering & Management System and 2007 Chinese Institute of Industrial Engineers Conference (APIEMS & CIIE2007) [CD-ROM}, Kaohsiung, Taiwan, December 9-12, 2007.
  46. Opaprakasit P., Opaprakasit M., Tangboriboonrat P., Crystallization Behaviors of Polylactide and Its Enantiomeric Blends, Proceeding of the 2nd International Conference on Advances in Petrochemicals and Polymers (ICAPP2007),Bangkok, Thailand, June 25 -28, 2007.
  47. Opiso, E.M., Babel, S., Opaprakasit, P., Removal of Cr (VI) from Synthetic Wastewater by Volcanic Ash Soil,Proceedings of the International Conference on Green and Sustainable Innovation (ICGSI2006), 2006, Chiang Mai, Thailand, 338-344.
  48. Risdiyono, Opaprakasit, P., Koomsap, P. (2006). Modifying Rapid Prototyping Technique for Natural Rubber Parts,The 7th Asia Pacific Industrial Engineering and Management Systems Conference (APIEMS 2006), Bangkok, Thailand, December 17 – 20, 2006, 2155- 2158.
  49. Risdiyono, Opaprakasit, P., Koomsap, P. (2006). Enhancing Natural Rubber’s Property For Rapid Prototyping,Proceedings of the 8th International Conference on Industrial Management – ICIM2006 (Qingdao, China), 2006, 1178-1183
  50. Opaprakasit P., Petchsuk A., Painter P.C., Malkov S., Dynamic 2D-FTIR Spectroscopic Studies of Poly(Vinylidine Fluoride/Trifluoroethylene/Chloro trifluoroethylene), P (VDF/TrFE/CTFE) Terpolymer, Proceedings of the International Conference on Smart Materials. Chiangmai, Thailand, December, 2004.
  51. Opaprakasit P., Kanchanasopa M., Malkov S., Runt J.P., Painter P.C., Study of Crystallization of Poly(lactide)s and Their Racemic Crystal Structure (Stereocomplex), Employing Two-Dimensional FTIR Correlation Spectroscopy,Proceedings of the Third Thailand Materials Science and Technology Conference. Bangkok, Thailand, August, 2004.
  52. Opaprakasit, P.; Painter, P.C.; and Coleman, M.M., Dissolution, Swelling Properties, and Complex Formation of Clays in NMP/CS2 Mixed Solvents, Papers Am. Chem. Soc., Div. Fuel. Chem. 2004.
  53. Opaprakasit, P.; Painter, P.C.; Coleman, M.M.; and Scaroni, A.W., Ionomer-Like Structures and Their Role in the Pyridine-Extractability of Argonne Premium Coals, Papers Am. Chem. Soc., Div. Fuel. Chem. 2001, 331-333.
  54. Painter, P.C.; Opaprakasit, P.; Sobkowiak, M.; and Scaroni, A, Phenolic Resins as Model for the Structure of Coals, Papers Am. Chem. Soc. Div., Fuel. Chem. 1999, 596- 600.
  55. Opaprakasit, P.; and Chan, H.S.O., Conducting Polyaniline Coated Inorganic Materials, Science Research Congress, National University of Singapore, Singapore, 1992.