Abstract
In this study, the copolyesters based on 4-hydroxybenzoic acid (HBA) and vanillic acid (VA), lactic acid (LA) and poly(butylene terephthalate) (PBT) were synthesized via melt polymerization and fully characterized by various measurements. The influences of content of HBA and VA units on thermal behavior, structure and degree of crystallinity of copolyesters were discussed in more detail. It was found that the copolymerization of aliphatic and aromatic units together could make the best use of advantages of the respective polyesters. Moreover, the copolyesters with more than 40 mol% of HBA and VA units could show liquid crystallinity in broad temperature range.
Notes
a Determined form second DSC heating curve (10°C/min).
b Determined form first DSC cooling curve (20°C/min).
c Determined form TG curve under N2 (20°C/min).
a w, weak; vw, very weak; s, strong; ms, medium strong; vs, very strong; vb, very broad; mb, medium broad.
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