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Nonsolvent induced phase separation preparation of poly(vinylidene fluoride-co-chlorotrifluoroethylene) membranes with tailored morphology, piezoelectric phase content and mechanical properties

Cardoso, V.F. ; Botelho, G. ; Lanceros-Méndez, S.

Materials & design, 2015-12, Vol.88, p.390-397 [Periódico revisado por pares]

Elsevier Ltd

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  • Título:
    Nonsolvent induced phase separation preparation of poly(vinylidene fluoride-co-chlorotrifluoroethylene) membranes with tailored morphology, piezoelectric phase content and mechanical properties
  • Autor: Cardoso, V.F. ; Botelho, G. ; Lanceros-Méndez, S.
  • Assuntos: Battery ; Coagulation ; Crystalline phases ; Hydrophobicity ; Mechanical properties ; Membranes ; Morphology ; Nonsolvent induced phase separation – NIPS ; Phase separation ; Poly(vinylidene fluoride-chlorotrifluoroethylene) – P(VDF-CTFE) ; Process parameters ; Tailored microstructure
  • É parte de: Materials & design, 2015-12, Vol.88, p.390-397
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: 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 β-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. [Display omitted] •P(VDF-CTFE) membranes have been processed by non-solvent induced phase separation.•Morphology, wettability and mechanical properties depend on the processing conditions.•Morphologies including large spherulites, micropores and/or microvoids were obtained.•P(VDF-CTFE) membranes can be tailored by this technique for specific applications.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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