Citation: Bing-tao Wang a, b, Yan Zhang b, Ping-an Song a, b, Zheng-hong Guo b, Jie Cheng b, Zheng-ping Fang a, b. BIODEGRADABLE ALIPHATIC/AROMATIC COPOLYESTERS BASED ON TEREPHTHALIC ACID AND POLY(L-LACTIC ACID): SYNTHESIS, CHARACTERIZATION AND HYDROLYTIC DEGRADATION[J]. Chinese Journal of Polymer Science, ;2010, 28(3): 405-415. doi: 10.1007/s10118-010-9032-y shu

BIODEGRADABLE ALIPHATIC/AROMATIC COPOLYESTERS BASED ON TEREPHTHALIC ACID AND POLY(L-LACTIC ACID): SYNTHESIS, CHARACTERIZATION AND HYDROLYTIC DEGRADATION

Received Date: 10 March 2009
Revised Date: 22 April 2009

Biodegradable aliphatic/aromatic copolyesters, poly(butylene terephthalate-co-lactate) (PBTL) were prepared via direct melt polycondensation of terephthalic acid (TPA), 1,4-butanediol (BDO) and poly(L-lactic acid) oligomer (OLLA). The effects of polymerization time and temperature, as well as aliphatic/aromatic moiety ratio on the physical and thermal properties were investigated. The largest molecular weight of the copolyesters was up to 64100 with molecular weight distribution index of 2.09 when the polycondensation was carried out at 230C for 6 h. DSC, XRD, DMA and TGA analysis clearly indicated that the degree of crystallinity, glass-transition temperature, melting point, decomposition temperature, tensile strength, elongation and Youngs modulus were influenced by the ratio between TPA and OLLA in the final copolyesters. Hydrolytic degradation results demonstrated that the incorporation of biodegradable lactate moieties into the aromatic polyester could efficiently improve hydrolytic degradability of the copolymer even though it still had many aromatic units in the main chains.
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