Abstract
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 α has been observed in selected conversion range for all copolyesters, indicating complex degradation reaction existed.
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