摘要
通过双螺杆挤出机制备了不同热塑性聚氨酯(TPU)含量的热塑性聚氨酯/聚乳酸(TPU/PLA)共混物,采用万能试验机、差示扫描量热仪(DSC)、扫描电子显微镜(SEM)、旋转流变仪对共混物的力学性能、热性能、聚集态结构和流变特性进行了研究。结果表明:当TPU质量分数为15%~20%时,TPU可以在PLA中形成纤维状聚集态,使共混物达到"韧而强"的特性,同时可以提高PLA的玻璃化转变温度,降低PLA的冷结晶温度;随着TPU含量的增加,PLA的熔体黏度、储能模量和损耗模量都增大。
Thermoplastic polyurethane/polylactic acid(TPU/PLA) blends with different content of TPU were prepared by twin screw extruder, and their tensile properties, thermal properties, aggregation structure, and rheological properties were studied by universal testing machine, differential scanning calorimeter(DSC), scanning electron microscope(SEM), and rotary rheometer. The results show that when the mass fraction of TPU is 15% ~20%, it can form fibrous aggregation state in PLA, which make the blends tough and strong, meanwhile, it can increase the glass transition temperature and decrease the cold crystallization temperature of PLA. With the increase of TPU content, the melt viscosity, storage modulus, and loss modulus of PLA increases.
作者
陈志平
冯羽风
陆春立
黄静
廖文靖
CHEN Zhiping;FENG Yufeng;LU Chunli;HUANG Jing;LIAO Wenjing(Guilin Electrical Equipment Scientific Research Institute Co.,Ltd.,Guilin 541004,China)
出处
《绝缘材料》
CAS
北大核心
2020年第5期13-17,共5页
Insulating Materials
基金
桂林电器科学研究院有限公司创新基金项目(18673)。
关键词
热塑性聚氨酯
聚乳酸
共混
增韧改性
thermoplastic polyurethane
polylactic acid
blends
toughening modification
