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Received June 16, 2006
Accepted March 16, 2007
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Synthesis and applications of unsaturated polyester resins based on PET waste
Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea 1R&D Center, Aekyung Chemical, 305-805, Korea 2R&D Center, Samsung Cheil Industries, 437-711, Korea
Korean Journal of Chemical Engineering, November 2007, 24(6), 1076-1083(8), 10.1007/s11814-007-0124-5
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Abstract
Three types of unsaturated polyester resins were synthesized from the glycolysis of polyethylene terephthalate (PET) plastic waste, considering environment, cost and properties for their applications. These synthesized unsaturated polyester resins could be used for various construction processes and materials such as no dig pipelining (NDR-1), pultrusion (PLR-1) and polymer concrete (PCR-1). PET was taken from common soft-drink bottles, and ethylene glycol (EG), diethylene glycol (DEG) and MPdiol glycol mixtures were used for the depolymerization at molar ratios. The glycolyzed PET 1st products (oligomers) were reacted with maleic anhydride, phthalic anhydride and dicyclopentadiene (DCPD) (especially for polymer concrete) to form unsaturated polyester resins with mixed styrene. The lab scale (1-5 kg) and pilot plant scale-up tests (200 kg) were experimented to evaluate the processing characteristics, viscosity, acid number and curing behaviors. The main properties such as hardness, flexural strength, tensile strength, heat distortion temperature, elongation, and chemical resistance were determined based on the various uses of the three resins. Furthermore, the applicability and the properties of these developed resins were verified through many real application tests.
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Marathe MN, Dabholkar DA, Jain MK, Process for the recovery of dimethyl terephthalate from polyethylene terephthalate, GB Patent 2 041 916 (1980)
Michel RE, Recovery of methyl esters of aromatic acid and glycols from thermoplastic polyesters scrap using methanol vapor, European Patent 484 963 (1992)
Socrate C, Vosa R, Continuous process for the recovery of terephthalic acid from waste or used polyalkylene terephthalate polymers, European Patent 662 466 (1995)
Viksne A, Kalnins M, Rence L, Berzina R, The Arabian Journal for Science and Engineering, 27, 33 (2002)
Mansour SH, Ikladious NE, Polym. Test, 21, 497 (2002)
Blackmon KP, Fox DW, Shafer J, Process for converting PET scrap to diamide monomers, European Patent 365 842 (1988)
Karayannidis GP, Achilias DS, Sideridou ID, Bikiaris DN, Eur. Polym. J., 41, 201 (2005)
Baudry A, Dufay J, Regnier N, Mortaigne B, Polym. Degrad. Stabil., 61, 441 (1998)
Partton TC, Alkyd resin technology, Interscience Publishers (1962)
Rebeiz KS, Cem. Concr. Compos., 17, 119 (1995)
Rebeiz KS, Constr. Build. Mater., 10, 215 (1996)
Moschiar SM, Reboredo MM, Kenny JM, VazQuez A, Polym. Compos., 17, 478 (1996)
Lee DG, Chin WS, Kwon JW, Yoo AK, Compos. Struct., 57, 67 (2002)
Kamile E, Gamze G, Polymer-Plastics Technology and Engineering, 44, 783 (2005)
