摘要
采用双螺杆挤出机,对聚(对苯二甲酸丁二醇酯-己二酸丁二醇酯)(PBAT)和热塑性淀粉(TPS)进行熔融共混,制备了可完全生物降解的PBAT/TPS共混物。采用扫描电子显微镜研究了共混物的微观结构与形态,测试了共混物的性能和应力-应变行为。结果表明,通过注射成型能够得到TPS原位微纤;PBAT/TPS共混物中存在PBAT相、甘油富集相和TPS富集相,TPS在PBAT中以微纤和颗粒状存在,在剪切较强的区域,TPS以微纤为主,伴有少量的TPS颗粒,在剪切较弱的芯层,TPS主要以颗粒为主;TPS同PBAT间具有较好的相容性,在拉伸过程中,通过原位微纤增强和TPS颗粒变形成纤两种增强模式提高了共混物的拉伸强度,使得共混物在高TPS含量下仍具有较好的力学性能。
A series of fully biodegradable blends was prepared by melt blending thermoplastic starch （TPS） and poly（butylene adipate-co-terephthalate） （PBAT） using a twin screw extruder. The microstructure and fracture behavior of the blends were studied with scanning electron microscopy （SEM） before and after being drawn, the properties of the blends with different compositions were tested. The results indicated that the TPS microfiber structure formed after injection, TPS fiber was inclined to disperse in shear zone and then distributed from core to skin with increasing content of TPS. It was obviously that the continuous fiber morphology from core to skin could improve the mechanical properties of blends.
出处
《中国塑料》
CAS
CSCD
北大核心
2014年第2期25-30,共6页
China Plastics
