PS/PLA共混物的相态结构及其发泡行为研究  

Morphology and Foaming Behavior of PS/PLA Blends

作　　者：刘本刚[1,2] 刘燕[1] 杜中杰[2] 

机构地区：[1]轻工业塑料加工应用研究所,北京100048 [2]北京化工大学碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《中国塑料》2015年第4期36-41,共6页China Plastics

摘　　要：采用密炼机制备了聚苯乙烯/聚乳酸(PS/PLA)共混物,以超临界二氧化碳(CO2)为物理发泡剂,采用釜压法制备了PS/PLA共混物泡沫。采用差示扫描量热仪、偏光显微镜和扫描电子显微镜研究了PLA等温结晶行为、PS/PLA共混物的相态结构和PS/PLA共混物泡沫的泡孔结构。结果表明,反应型增容剂使PLA的等温结晶速率提高,晶体尺寸降低;增容剂能够促进PLA在PS中的分散;PLA的加入在发泡过程中能够起到异相成核作用,PLA的结晶有利于气泡的增长和稳定。Polystyrene and poly(lactic acid)(PS/PLA)blends were prepared by an internal mixer.PS/PLA foams were made by the batch method with CO2 as foaming agent.The isothermal crystallization behavior of PLA,morphology of PS/PLA blends,and cellular morphology of PS/PLA blend foams were characterized by differential scanning calorimeter,polarizing microscope,and scanning electron microscope.The results showed that the isothermal crystallization rate of PLA increased,and the crystal size decreased with the increasing reactive compatibilizer dosage.The PS/PLA blends with the compatibilizer was better than those without compatibilizer.PLA can serve as the nucleation agent when being blended with PS.The crystal of PLA was in favour of cell growth and stabilization.

关 键 词：聚苯乙烯 聚乳酸 共混物 反应型增容剂 相态结构 发泡行为 

分 类 号：TQ328[化学工程—合成树脂塑料工业]