Preparation of Microporous Polypropylene/Titanium Dioxide Composite Membranes with Enhanced Electrolyte Uptake Capability via Melt Extruding and Stretching
Preparation of Microporous Polypropylene/Titanium Dioxide Composite Membranes with Enhanced Electrolyte Uptake Capability via Melt Extruding and Stretching
复制标题
通过熔融挤出和拉伸制备具有增强电解质吸收能力的微孔聚丙烯/二氧化钛复合膜
DOI：
10.3390/polym9030110
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发表时间：
2017-03-01
期刊：
影响因子：
5
通讯作者：
Xiong, Chuanxi
中科院分区：
文献类型：
--
作者：
Wang, Shan;Ajji, Abdellah;Xiong, Chuanxi
在这项工作中，共混策略的基础上复合的亲水性二氧化钛（TiO 2）粒子与主体聚丙烯（PP）粒料，然后由熔融挤出/退火/拉伸的常见膜制造工艺，用于改善极性，从而电解质吸收能力的PP基微孔膜。采用差示扫描量热法（DSC）、X射线衍射法（XRD）和红外二向色性法研究了TiO2粒子对PP基体结晶度和结晶取向的影响。结果表明，TiO2的加入对PP基复合膜的取向片层结构影响不大。研究表明，PP/TiO2复合薄膜在单向拉伸应力作用下，发生了片层分离和界面脱粘。扫描电子显微镜（SEM）观察证实了拉伸PP/TiO2复合膜中产生了两种形式的微孔。与原始PP膜相比，PP/TiO 2复合膜特别是在高TiO 2负载下在水蒸气渗透性、极性和电解质吸收能力方面显示出显著的改善。含40wt%TiO2的PP/TiO2复合膜的电解质吸收率为104%，与原始PP膜相比几乎增加了一倍。
In this work, a blending strategy based on compounding the hydrophilic titanium dioxide (TiO2) particles with the host polypropylene (PP) pellets, followed by the common membrane manufacture process of melt extruding/annealing/stretching, was used to improve the polarity and thus electrolyte uptake capability of the PP-based microporous membranes. The influence of the TiO2 particles on the crystallinity and crystalline orientation of the PP matrix was studied using differential scanning calorimetry (DSC), X-ray diffraction (XRD), and infrared dichroic methods. The results showed that the TiO2 incorporation has little influence on the oriented lamellar structure of the PP-based composite films. Investigations of the deformation behavior indicated that both the lamellar separation and interfacial debonding occurred when the PP/TiO2 composite films were subjected to uniaxial tensile stress. The scanning electron microscopy (SEM) observations verified that two forms of micropores were generated in the stretched PP/TiO2 composite membranes. Compared to the virgin PP membrane, the PP/TiO2 composite membranes especially at high TiO2 loadings showed significant improvements in terms of water vapor permeability, polarity, and electrolyte uptake capability. The electrolyte uptake of the PP/TiO2 composite membrane with 40 wt % TiO2 was 104%, which had almost doubled compared with that of the virgin PP membrane.