Fabrication of microporous membranes from melt extruded polypropylene precursor films via stretching: Effect of annealing
Fabrication of microporous membranes from melt extruded polypropylene precursor films via stretching: Effect of annealing
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DOI：
10.1007/s10118-015-1643-x
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发表时间：
2015-07-01
影响因子：
4.3
通讯作者：
Guo, Shao-yun
中科院分区：
文献类型：
--
作者：
Wang, Shan;Saffar, Amir;Guo, Shao-yun
在这项工作中，退火条件对聚丙烯（PP）前体膜的微观结构，并进一步对拉伸膜的多孔结构和渗透性的影响进行了研究。WAXD、FTIR、DSC和DMA的结合结果清楚地表明，随着退火温度的升高，前驱体膜的结晶取向和结晶度增加，而非晶相中的分子链缠结减少。变形行为的变化表明，在较高的温度下退火的薄膜发生更多的片层分离。通过SEM观察膜的表面形貌，发现随着退火温度的升高，膜的孔数增多，孔结构均匀。根据SEM结果，膜的渗透性随着退火温度的增加而增加。另一方面，发现10分钟几乎足以用于退火过程以获得具有最佳渗透性的微孔膜。
In this work, the effects of annealing conditions on the microstructure of polypropylene (PP) precursor films and further on the porous structure and permeability of stretched membranes were investigated. Combinations of WAXD, FTIR, DSC and DMA results clearly showed the crystalline orientation and crystallinity of the precursor film increased with annealing temperature, while the molecular chain entanglements in the amorphous phase decreased. Changes in the deformation behavior suggested more lamellar separation occurred for the films annealed at higher temperatures. Surface morphologies of the membranes examined by SEM revealed more pore number and uniform porous structure as the annealing temperature increased. In accordance with the SEM results, the permeability of the membranes increased with annealing temperature. On the other hand, it was found that 10 min was almost enough for the annealing process to obtain the microporous membranes with an optimal permeability.