摘要
将聚己内酯(PCL)与聚乳酸(PLA)按照不同比例熔融共混制备PCL/PLA薄膜,并采用角质酶对其进行降解。研究了共混物薄膜在降解过程中各种性能的变化。实验结果表明,纯PCL经角质酶降解72 h后,其降解率可达80%以上。随着PLA含量的增加,降解率逐渐降低。但是,当PCL含量大于50%时,降解率均大于50%。观察降解后薄膜的微观形态发现,当PCL与PLA以80/20、60/40和50/50的比例共混时,两者相容性较差且呈现出典型的球形液滴分散相。共混体系中PLA的比例能够影响共混物的形态变化,当PLA含量大于60%时,最终形成微小空洞,且降解率较低。差示扫描量热和X射线衍射分析表明,随着PLA含量的增加,材料薄膜的熔融温度呈降低的趋势,PCL组分晶体化程度降低。但是,当PLA含量小于50%时,晶体化差异较小。因此,当PLA掺杂量小于50%时,各比例.PCL/PLA共混薄膜的材料性能差异较小。
Poly( ε-caprolactone)( PCL) and polylactic acid( PLA) were blended with different ratios to prepare PCL/PLA films. The films were degraded by cutinase and the changes in performance were analysized. The results showed that the weight loss rate of neat PCL reached more than 80% after degradation for 72 h by cutinase. The weight loss rates gradually decreased with the increase of PLA content. It was greater than 50% when the PCL content was more than 50%. From the microscopic morphology of the degraded film,the compatibility was poor and a typical spherical droplet dispersion phase presented when PCL and PLA were mixed in a ratios of 80/20,60/40 and 50/50. The morphology of the blends changed with the different ratio of PLA. Small holes were formed eventually and the degradation rate was low when the PLA content was greater than 60%. Scanning electron microscopy and X-Ray diffraction analysis showed that the melting temperatures and crystallization of PCL component decreased with the increase of PLA content. However,the effect was not significant when the PLA content was less than 50%. Therefore,the properties of PCL/PLA films had less difference when the PLA doping was less than 50%.
作者
于冶杭
赵子玉
苏婷婷
王战勇
YU Yehang;ZHAO Ziyu;SU Tingting;WANG Zhanyong(College of Chemistry,Chemical Engineering and Environmental Engineering,Liaoning Shihua University,Fushun,Liaoning 113001,China)
出处
《塑料》
CAS
CSCD
北大核心
2020年第5期112-115,共4页
Plastics
基金
辽宁省自然科学基金(20180550589)。
关键词
聚己内酯
聚乳酸
熔融共混
生物降解
角质酶
poly(ε-caprolactone)
polylactic acid
melt blending
biodegradation
cutinase
