Journal
MATERIALS & DESIGN
Volume 88, Issue -, Pages 390-397Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.09.018
Keywords
Poly(vinylidene fluoride-chlorotrifluoroethylene) - P(VDF-CITE); Nonsolvent induced phase separation - NIPS; Tailored microstructure; Crystalline phases; Mechanical properties
Categories
Funding
- FEDER through the COMPETE Program
- Portuguese Foundation for Science and Technology (FCT) [PEST-C/FIS/UI607/2013, PEST-C/QUI/UIO686/2013, NORTE-07-0124-FEDER-000037]
- Programa Operacional Regional do Norte (ON.2 - O Novo Norte), under the Quadro de Referencia Estrategico Nacional (QREN), through the Fundo Europeu de Desenvolvimento Regional (FEDER)
- FCT [SFRH/BPD/98109/2013]
- Fundação para a Ciência e a Tecnologia [PEst-C/FIS/UI0607/2013, PEst-C/QUI/UI0686/2013] Funding Source: FCT
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Poly(vinylidene fluoride-co-chlorotrifluoroethylene) - P(VDF-CTFE) membranes are increasingly interesting for a wide range of applications, including battery separators, filtration membranes and biomedical applications. This work reports on the morphology, hydrophobicity, thermal and mechanical properties variation of P(VDF-CTFE) membranes processed by nonsolvent induced phase separation (NIPS) technique as a function of the main processing parameters. All membranes show a porous structure composed of large spherulites, (interconnected) micropores and/or microvoids depending on the processing conditions used that in turn affect their hydrophobicity and mechanical properties. The degree of crystallinity of the membranes remains approximately constant with a value of about 15%, except for the membranes immediately immersed in ethanol, which is of about 23%. In turn, the crystalline phases present in the copolymer is mainly affected by the temperature and nonsolvent characteristics of the coagulation bath, the beta-phase content ranging from 33 to 100%, depending on those processing parameters. It was show that the temperature of water-based coagulation bath plays an important role in order to produce structurally uniform and homogeneous porous membranes, which is particularly important from the point of view of technological applications. (C) 2015 Elsevier Ltd. All rights reserved.
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