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Effect of polymer dissolution temperature and conditioning time on the morphological and physicochemical characteristics of poly(Vinylidene fluoride) membranes prepared by non-solvent induced phase separation

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Resumo:This work reports on the production of poly(vinylidene fluoride) (PVDF) membranes by non-solvent induced phase separation (NIPS) using N,N-dimethylformamide (DMF) as solvent and water as non-solvent. The influence of the processing conditions in the morphology, surface characteristics, structure, thermal and mechanical properties were evaluated for polymer dissolution temperatures between 25 and 150 °C and conditioning time between 0 and 10 min. Finger-like pore morphology was obtained for all membranes and increasing the polymer dissolution temperature led to an increase in the average pore size (≈0.9 and 2.1 µm), porosity (≈50 to 90%) and water contact angle (up to 80°), in turn decreasing the β PVDF content (≈67 to 20%) with the degree of crystallinity remaining approximately constant (≈56%). The conditioning time did not significantly affect the polymer properties studied. Thus, the control of NIPS parameters proved to be suitable for tailoring PVDF membrane properties
Autores principais:Teixeira, João Luís Rodrigues
Outros Autores:Cardoso, Vanessa Fernandes; Botelho, Gabriela; Morão, António Miguel; Nunes-Pereira, J.; Lanceros-Méndez, S.
Assunto:poly(vinylidene fluoride) Membranes Non-solvent induced phase separation Dissolution temperature Conditioning time Engenharia e Tecnologia::Biotecnologia Industrial
Ano:2021
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso restrito
Instituição associada:Universidade do Minho
Idioma:inglês
Origem:RepositóriUM - Universidade do Minho

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