Preparation of Biodegradable Polybutanediol Adipate and Modifications of Polyglycolic Acid
Polyglycolic acid(PGA),as a coal-based biodegradable polymer material,has excellent mechanical properties and barrier properties,but its poor toughness makes it difficult to be applied in a large scale.In this work,a biodegradable polyester poly(butanediol adipate)(PBA)was designed and used to toughen PGA significantly.PBA was prepared by melting polycondensation of 1,6-adipic acid(AA)and 1,4-butanediol(BDO)under high vacuum conditions.The successful preparation of PBA was confirmed by NMR,Fourier transform infrared spectroscopy and gel permeation chromatography.The results show that the weight-average molecular weight of PBA is 62 506 and the polydispersity index is 2.1.PBA,PGA and epoxy chain extender were blended by melt blending to toughen PGA.The results of scanning electron microscopy(SEM)show that the compatibility of PGA and PBA is significantly improved by the epoxy chain extender,and the particle sizes of PBA dispersed phases are significantly reduced after the addition of epoxy chain extender.The results of the mechanical properties show that when the epoxy chain extender and PBA with a mass content of 50 parts are added,the PGA shows a tensile strength of(48.6±2.5)MPa,an elongation at break of 458.3%±23.9%,and a notch impact strength of(126.3±7.7)kJ/m2.Compared with the pure PGA sample,the elongation at break and notch impact strength are respectively increased by 43 and 46 times.
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