含PCL和PBST链段聚酯聚氨酯的合成与表征

为提高PBS基脂肪族聚酯的综合性能,通过ε-己内酯的开环聚合制备了端羟基的聚己内酯(PCL-OH),再通过熔融缩聚法制备了端羟基的聚(丁二酸丁二醇酯对苯二甲酸丁二醇酯)无规共聚物(PBST-OH),用氢化MDI(H12MDI)作为扩链剂,制得了可生物降解的聚酯聚氧酯(PPCLBST).采用核磁共振谱和红外光谱确定了PP...

Synthesis and characterization of poly (ester urethane) via chain extension of PCL and PBST prepolymers

To enhance the property of PBS-based aliphatic polyester,biodegradable poly(ester urethane) s(PPCLBSTs) were obtained through chain-extension reaction of prepolymers,poly(ε-caprolactone)(PCL-OH) and poly(butylenes succinate-co-butylenes terephthalate)(PBST-OH) with H12MDI as chain extender.PCL-OH was synthesized by ring-opening polymerization while PBST-OH was synthesized by melting polycondensation reaction.The structure and composition of PPCLBSTs was characterized by 1H-NMR and FT-IR,the thermal and crystallization properties of PPCLBSTs were investigated by DSC and TGA,and the hydrophilic ability of PPCLBSTs was characterized by water absorption test.The results showed that the crystallization of PPCLBSTs was mainly caused by PBST-OH segments,and it was difficult for PCL-OH segments to crystallize.The glass-transition temperature decreased and was trend to be amorphous for PPCLBSTs as the content of PCL-OH segments increased.The thermal decomposition of PPCLBSTs under went a two-stage process: PCL-OH segments degraded in the first and the PBST-OH segments degraded in the second.PPCLBSTs had good thermal stability and better hydrophilic ability than that of PBS because of hard-segment and soft-segment in one polymer chain.