Novel Semibiobased Copolyester Containing Poly(trimethylene-co-hexamethylene Terephthalate) and Poly(lactic Acid) Segments

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• 作者：Zhu Xiong ; Jian-Bing Zeng ; Xiu-Li Wang ; Yu-Rong Zhang ; Ling-Ling Li ; Yu-Zhong Wang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2010
• 出版时间：July 7, 2010
• 年：2010
• 卷：49
• 期：13
• 页码：5986-5992
• 全文大小：209K
• 年卷期：v.49,no.13(July 7, 2010)
• ISSN：1520-5045

文摘

Poly (l-lactic acid) (PLLA) is a biobased polymer, and poly(trimethylene terephthalate) (PTT) is a semibiobased polymer. However, PLLA is biodegradable, and PTT is not. In this paper, their copolymers (PTHT−PLLA) are synthesized via chain-extension reaction of hydroxyl terminated poly(trimethylene-co-hexamethylene terephthalate) (PTHT−OH) and hydroxyl terminated poly(l-lactic acid) (PLLA−OH) using toluene-2,4-diisocyanate (TDI) as a chain extender. The structures and molecular weights of PTHT−OH, PLLA−OH, and PTHT−PLLA were characterized by Fourier transform infrared (FTIR) spectroscopy, proton nuclear magnetic resonance (¹H NMR), and gel permeation chromatography (GPC). The thermal, crystalline, and mechanical properties of PTHT−PLLA were further studied by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and tensile testing. The resulting PTHT−PLLA copolyesters went through a two-stage thermal decomposition behavior and showed two glass transition temperatures. The tensile testing results showed that PTHT−PLLA copolyesters have excellent flexibility with a strain of more than 300%, which is much higher than that of PLLA. The copolyesters are expected to have a better biodegradability than PTT.