Fabrication of microporous membranes from melt extruded polypropylene precursor films via stretching: Effect of annealing |
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| Authors: | Shan Wang Amir Saffar Abdellah Ajji Hong Wu Shao-yun Guo |
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| Institution: | 1. The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University,Chengdu 610065, China;Research Center for High performance Polymer and Composite Systems(CREPEC), Chemical Engineering Department,Polytechnique Montreal, P.O.Box 6079, Montreal, Quebec H3C 3A7, Canada;2. Research Center for High performance Polymer and Composite Systems(CREPEC), Chemical Engineering Department,Polytechnique Montreal, P.O.Box 6079, Montreal, Quebec H3C 3A7, Canada;3. The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University,Chengdu 610065, China |
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| Abstract: | 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. |
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| Keywords: | Annealing Microporous membrane Polypropylene Crystalline orientation Deformation behavior |
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