Synthesize and Crystallization Kinetics of Biodegradable Aliphatic Poly(Butylene Succinate-Co-Diethylene Glycol)

Biodegradable aliphatic poly(butylene succinate-co-diethylene succinate) (PBDEGS) were synthesized from succinic acid and diethylene glycol through a two step polycondensation with titanium tetraisoproxide (TTP) as catalyzer and polyphosphate (PPA) as the stablilizer at high temperature. The differential scanning calorimeter (DSC) was used to investigate the melting behavior, crystallization behavior and non-isothermal crystallization kinetics of this copolyester. The melting behavior showed that the melting temperature of the copolyester decreased gradually with increaseing of diethylene glycol in the copolyester. The crystallization mechanism of PBDEGSs were analyzed with the Avrami equation. The result showed that the DEG chains affected the crystallization mechanism of PBS and decreased overall crystallization rate in some extent. The contrastive method of Mo analysis showed similar rasult. At the same time, because of the flexible ether bond existed in the DEG molecules, the crystallization activation energy of PBDEGSs is obviously lower than that of PBS.