摘要
采用熔融共混法在同向旋转双螺杆挤出机上制备了不同配比的聚乳酸/己二酸-对苯二甲酸-丁二酯共聚物(PLA/PBAT)共混物、PLA/PBAT/扩链剂(ADR)共混物和不同工艺条件时(不同螺杆转速、不同温度)的PLA/PBAT共混物;通过扫描电子显微镜考察了共混物的形态结构,并对其冲击性能进行了测试。结果表明,在PLA/PBAT配比为85/15时共混物呈现出韧性断面,同时冲击强度也明显增加,说明PBAT的加入大大改善了PLA的脆性;扩链剂ADR的加入,进一步改善了共混物的韧性,在ADR用量为0.6%时,冲击强度提高了320%;随着螺杆转速的增加,PLA/PBAT(85/15)共混物的韧性提高,在螺杆转速为80r/min时冲击强度达到最大值11.25kJ/m2。
PLA/PBAT blends with various loadings of PBAT and chain extender ADR were prepared by a twin-screw extruder at different processing conditions, including twin-screw speeds and die temperature. Phase morphology of the resultant blends were observed by SEM. And their impact properties were tested also. It is shown that the toughness of PLA was improved a lot with the addition of PBAT, and the fractured surfaces of PLA/PBAT with ratio of 85/15 exhibited roughened feature. The impact strength of PLA/PBAT （85/15） increased by 320 % while the loadings of chain extender ADR is 0. 6 %. With the increase of twin-screw speed, the impact strength of the blend increased, and reached its best value 0.45 kJ/m2 at the speed of 80 r/min.
出处
《中国塑料》
CAS
CSCD
北大核心
2013年第7期57-61,共5页
China Plastics
基金
北京工商大学教育教学改革研究项目
