流延工艺条件对聚乙烯流延基膜取向片晶结构和拉伸成孔性的影响  

Effects of Casting Technique on Oriented Lamellar Structure of HDPE Casting Film and Its Micropore-Forming Performance by Uniaxial Stretching

作　　者：沈鹏[1] 杨兴成[1] 朱梦冰[1] 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

出　　处：《高分子材料科学与工程》2015年第5期129-134,共6页Polymer Materials Science & Engineering

摘　　要：在不同流延工艺条件下制备HDPE流延基膜,经过热处理后施加单向拉伸作用使流延基膜转变为微孔膜。通过差示扫描量热法、傅里叶变换红外光谱、原子力显微镜以及孔隙率和透气率表征流延基膜的取向片晶结构和微孔膜的孔结构,研究了流延工艺条件对基膜的取向片晶结构及拉伸成孔性的影响。研究表明,提高牵伸比可以明显增加片晶取向程度,使基膜获得更好的拉伸成孔性;提高流延辊温度能增加基膜结晶度和片晶厚度,取向片晶结构更加完善;施加风刀冷却可以通过形成稳定取向晶核来促进基膜形成取向片晶结构,提高其拉伸成孔性。High density polyethylene( HDPE) microporous membranes were prepared by stretching HDPE casting films uniaxially. The effect of casting conditions on the structure of lamellae and HDPE stretched microporous membranes was characterized by DSC,FT-IR,AFM and the measurements of porosity and permeability. The results show that the larger draw ratio could greatly promote the lamellar crystalline orientation which results in better performance of micropore formation for the precursor films. Raising temperature of cast roll increases the crystallinity and lamellar thickness of the cast films which results in the better oriented lamellar structure. Appropriate air cooling is favorable for the formation and growth of oriented crystal lamellae in the casting films,and gives a rise to better micropore-forming performance by uniaxial stretching.

关 键 词：聚乙烯微孔膜 流延基膜 流延工艺 取向片晶结构 拉伸成孔性 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]