中国塑料2018，Vol.32Issue(6)：28-34,7.DOI:10.19491/j.issn.1001-9278.2018.06.004
低温冷拉对具有排核片晶结构的PVDF微孔膜成孔的影响
Effect of Low-temperature Cold Draw on Porosity of PVDF Microporous Membrane with Lamellar Crystalline Structure
任州之 1赵梦 1杨鸣波 1冯建明1
作者信息
- 1. 四川大学高分子科学与工程学院,高分子材料国家重点实验室,成都610065
- 折叠
摘要
Abstract
As a polymer with excellent mechanical strength,heat resistance ability and chemical stability,poly (vinylidene fluoride)(PVDF)was used to prepare microporous membrane for lithium battery through melt extrusion and post draw.A row-nucleated lamellar crystalline structure was achieved by adjusting the draw ratio during the process.The investigation results indicated that the casting film was highly orientated along the flowing direction.It is hard for cast film to gain a proper porous structure at room temperature stretching due to short relaxation time of PVDF,even if the cast film achieved the row-nucleated lamellar structure.Based on the time-temperature equivalence principle,the reduction of cold-drawing temperature can lead to the same effect by increasing relaxation time.More plastic deformation was generated in the amorphous region when the cast film was drawn at a low temperature below room temperature.By comparing the SEM images of the film drawn at different temperature,it was observed that the film cold-drawn at low temperatures exhibited much better porous structure and pore-size distribution.The formation mechanisms of microporous structure at low-temperature cold draw were also discussed.关键词
聚偏氟乙烯/微孔膜/低温拉伸/排核片晶/松弛Key words
poly(vinylidene fluoride)/microporous membrane/low-temperature cold draw/row-nucleated lamellar structure/relaxation分类
化学化工引用本文复制引用
任州之,赵梦,杨鸣波,冯建明..低温冷拉对具有排核片晶结构的PVDF微孔膜成孔的影响[J].中国塑料,2018,32(6):28-34,7.
