Hydrolytic and thermal oxidative degradation behavior of thermotropic aromatic-aliphatic copolyesters

作者：Wei, Peng^*; Wang, Yanping; Xia, Yumin; He, Yong; Wang, Yimin

来源：Journal of Thermal Analysis and Calorimetry, 2017, 128(2): 1067-1076.

DOI：10.1007/s10973-016-5975-8

• Thermotropic
• Aromatic aliphatic copolyester
• Lactic acid
• Hydrolytic degradation
• Thermal oxidative degradation

In this study, the hydrolytic and thermal oxidative degradation behavior of thermotropic aromatic-aliphatic copolyesters based on 4-hydroxybenzoic acid (HBA), 4-hydroxy-3-methoxybenzoic acid (VA), poly(butylene terephthalate) (PBT) and lactic acid (LA) have been investigated. The hydrophilicity and alkaline hydrolytic degradation rate of copolyesters increased with increasing LA contents. FTIR, DSC and TG results suggested that breakage of molecular chain mainly took place on aliphatic segments and also amorphous part. SEM analysis indicated the hydrolytic degradation followed surface corrosion mechanism. The dynamic TG results showed that all copolyesters exhibit total mass loss and two degradation stages under air atmosphere. The thermal oxidative degradation kinetics were evaluated by Kissinger and KAS method. The dependence of E values on conversion alpha has been observed in selected conversion range for all copolyesters, indicating complex degradation reaction existed.

• 出版日期2017-5
• 单位中原工学院; 东华大学