聚丙烯流延基膜的硬弹性结构及拉伸成孔性  

Structure of Hard Elastic Polypropylene Cast Films and Its Influence on the Microporous Membrane Formation

作　　者：谢洵[1] 杨兴成[1] 杨茜 邱园鑫 丁永红[1] 俞强[1] 

机构地区：[1]常州大学材料科学与工程学院江苏省太阳能电池材料与技术重点实验室,江苏常州213164 [2]江苏领航材料科技有限公司,江苏常州213164

出　　处：《高分子材料科学与工程》2013年第5期109-112,116,共5页Polymer Materials Science & Engineering

基　　金：江苏省太阳能电池材料与技术重点实验室资助项目

摘　　要：在不同流延条件下制备聚丙烯(PP)流延基膜,并对基膜施加拉伸使其形成微孔,通过差示扫描量热测试和傅立叶变换红外光谱表征基膜的结晶度、片晶厚度和晶区的取向程度等硬弹性结构参数,使用扫描电镜观察微孔膜的孔形态并测定了微孔膜的透气率,研究了流延工艺条件与基膜的硬弹性结构及拉伸成孔性之间的关系。结果表明,流延辊温度主要影响基膜结晶度和片晶厚度,牵伸比主要影响晶区取向程度。基膜硬弹性结构越完善,弹性回复率越大,拉伸后形成的微孔数量越多,孔形态和孔结构更加均匀,透气率增大。The hard elastic polypropylene （PP） cast films were prepared under different casting conditions and the relations between hard elastic structure and micropore formation were investigated. The crystallinity, lamellar thickness and lamellar crystalline orientation of PP cast films were characterized by DSC and FT-IR. Microporous structure was evaluated via SEM and Gurley value It is found that cast roll temperature mainly affects the crystallinity and lamellar thickness, while the draw ratio primarily influences the lamellar crystalline orientation. The PP films having more perfect crystallite structures have the higher elastic recovery（ER） value. And PP cast films with higher elastic recovery values show better micropore-forming performance after uniaxial stretching. The resulting PP microporous membranes have increased number of micropores, uniformly distributed microporous structure, and higher air permeability

关 键 词：聚丙烯流延膜 硬弹性结构 拉伸成孔性 微孔膜 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]