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Preparation of microporous polypropylene/titanium dioxide composite membranes with enhanced electrolyte uptake capability via melt extruding and stretching

Shan Wang, Abdellah Ajji, Shaoyun Guo and Chuanxi Xiong

Article (2017)

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Cite this document: Wang, S., Ajji, A., Guo, S. & Xiong, C. (2017). Preparation of microporous polypropylene/titanium dioxide composite membranes with enhanced electrolyte uptake capability via melt extruding and stretching. Polymers, 9(3). doi:10.3390/polym9030110
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Abstract

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.

Uncontrolled Keywords

electrolyte uptake; lamellar orientation; microporous membrane; polypropylene; stretching; titanium dioxide

Open Access document in PolyPublie
Department: Département de génie chimique
Research Center: CREPEC - Centre de recherche sur les systèmes polymères et composites à haute performance
Funders: National Science Foundation of China, Chinese Scholarship Council (CSC).
Grant number: 1673154
Date Deposited: 16 May 2022 16:34
Last Modified: 17 May 2022 01:20
PolyPublie URL: https://publications.polymtl.ca/5164/
Document issued by the official publisher
Journal Title: Polymers (vol. 9, no. 3)
Publisher: MDPI
Official URL: https://doi.org/10.3390/polym9030110

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