Multiple melting behavior of biodegradable poly(butylene succinate-co-terephthalate) (PBST) copolyester

摘要

The multiple melting behavior of biodegradable poly(butylene succinate-co-terephthalate) (PBST) copolyester with 70 mol% aromatic units isothermally crystallized at various temperatures was investigated by wide angle X-ray diffraction, differential scanning calorimetry (DSC) and modulated DSC (MDSC). PBST copolyester exhibited at most three melting peaks in the DSC heating traces and the dual lamellar population model was utilized for interpreting the origin of the multiple melting behavior. Multiple melting peaks were observed even at high heating rates and the co-existence of the melting-recrystallization-remelting model was suggested. The MDSC results gave the direct evidences to the conclusion that the combination of the two models mentioned above was able to explain the multiple melting behavior of PBST copolyester properly.