微型注塑条件下剪切力和β成核剂对PP/PS共混物结晶行为影响的研究  

Effect of Shear Rate and β-Nucleating Agent on Crystallization of Polypropylene/Polystyrene Blends under Micro-Injection Molding Condition

作　　者：武家男 苏巨桥[1] 王爱国[2] 王龙 张通英 杨丽岩 赵中国[1] 杨其[1] 

机构地区：[1]四川大学高分子科学与工程学院高分子材料工程国家重点实验室,四川成都610065 [2]青岛国恩科技股份有限公司,山东青岛266109 [3]四川大学吴玉章学院,四川成都610065

出　　处：《塑料科技》2016年第6期84-88,共5页Plastics Science and Technology

基　　金：高分子材料工程国家重点实验室自主课题经费资助(sklpme2014-2-08)

摘　　要：主要对聚苯乙烯(PS)和β成核剂在微型注塑中对等规聚丙烯(i PP)形态结构和结晶行为的影响进行了研究。通过扫面电镜(SEM)观察发现,在较高的剪切力作用下,PS的相形态发生变化,逐渐变为椭圆形和纤维状形态。偏光显微镜(PLM)结果表明,微型制品中存在明显的"皮-芯"结构,并且PS的加入使取向层厚度增加,成核剂的加入会使晶体更加细化,成核强度增加。DSC和WAXD结果也同时表明了微型注塑中的剪切力和温度场能够促进β晶的生成,并且成核剂的加入能够明显提高结晶温度,增加β晶的含量。2D-WAXD测试结果表明,成核剂和PS的相互作用会使分子链取向更加明显。The effects of polystyrene （PS） and β nucleating（β-NA） agents on the morphology and crystallization behavior of isotactic polypropylene （iPP） in micro injection molding were studied. The SEM results show that, the phase state of PS changes gradually into oval and fibrous morphology under the high shear stress. PLM observation shows that there is a clear ＂skin-core＂ structure in the micro products, and the addition of PS makes the thickness of the alignment layer increase, the nucleation agent will make the crystal more refined, and the nucleation intensity increases. Furthermore, addingβ-NA refined the crystals. The results of DSC and WAXD both show that the shearing force and temperature field can promote the formation ofβ crystal, and the addition of nucleating agent can obviously increase the crystallization temperature and increase the content ofβ crystal. The results of 2D-WAXD indicate that the interaction of nucleating agent and PS can make the orientation of molecular chain more obvious.

关 键 词：微型注塑 聚丙烯 聚苯乙烯 结晶行为 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]