摘要
通过溶液共混的方法制备了左旋聚乳酸(PLLA)/环氧化天然橡胶(EN R-50)共混物,研究了EN R-50对PLLA的热稳定性、结晶性、力学性能和降解性能的影响。结果表明,EN R-50因环氧基团的存在,其引入可以显著提高PLLA的热稳定性。同时,分子运动性较高的弹性体虽不利于PLLA的成核,但可以提高其晶体生长速率。脆断面扫描电镜(SEM)结果表明,EN R-50呈椭球状均匀分散于PLLA中,作为应力集中物,经退火处理一定时间后EN R-50可以显著提高PLLA的韧性。此外,10%(质量分数)以内EN R-50的引入并不影响PLLA的酶降解速率。
Poly(L-lactic acid)(PLLA)/epoxidized natural rubber(EN R-50)blends were prepared by solution casting,and the effects of EN R-50 on the thermal stability,crystallinity,mechanical properties and degradation properties of PLLA were studied.The results indicated that the introduction of EN R-50 significantly improved the thermal stability of PLLA due to the presence of its epoxy groups.In addition,although elastomers with higher molecular mobility are not conducive to the nucleation of PLLA,addition of EN R-50 did increase its crystal growth rate.Scanning electron microscope(SEM)micrographs of the fracture surface showed that EN R-50 was uniformly dispersed in PLLA with an ellipsoidal shape.As a stress concentrator,EN R-50 can significantly improve the toughness of PLLA after annealing for a certain time.In addition,the introduction of EN R-50 up to a mass fraction of 10%does not affect the enzymatic degradation rate of PLLA.
作者
蒋妮
宁振勃
甘志华
JIANG Ni;NING ZhenBo;GAN ZhiHua(College of Life Science and Technology,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第6期55-61,共7页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
国家自然科学基金(51973010)
北京市自然科学基金(2182052)。
关键词
聚乳酸
环氧化天然橡胶
退火
降解性
poly(lactic acid)
epoxidized natural rubber
annealing
degradability
