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
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
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
关键词
聚丙烯流延膜
硬弹性结构
拉伸成孔性
微孔膜
polypropylene cast films
hard elastic
micropore-formation by stretching
microporous membranes
