Tailoring porous structure of ferroelectric poly(vinylidene fluoride-trifluoroethylene) by controlling solvent/polymer ratio and solvent evaporation rate |
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| Authors: | António California Vanessa F. Cardoso Carlos M. Costa Vitor Sencadas Gabriela Botelho José L. Gómez-Ribelles Senentxu Lanceros-Mendez |
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| Affiliation: | 1. Centro/Departamento de Física, Universidade do Minho, Campus de Gualtar, 4710-058 Braga, Portugal;2. Department of Industrial Electronics, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal;3. Centro/Departamento de Química, Universidade do Minho, 4710-057 Braga, Portugal;4. Center for Biomaterials and Tissue Engineering, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain;5. Prince Felipe Research Center, Autopista del Saler 16, 46013 Valencia, Spain;6. Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Valencia, Spain |
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| Abstract: | Ferroelectric macroporous poly(vinylidene fluoride-trifluoroethylene) membranes have been produced by isothermal crystallization from the solution at different temperatures starting from different diluted solutions of the co-polymer in dimethylformamide. In this way pore architecture, consisting in interconnected spherical pores can be obtained. The mechanism and kinetics of solvent evaporation was investigated and related to the evolution of the polymer microstructure. The mechanism underlying the pattern formation has been discussed on the light of the Flory–Huggins (FH) lattice theory, grain boundary effects and the Cahn–Hilliard equation for mass conservation systems. It was also observed that the temperature or initial concentration of the crystallization process does not affect the phase, ferroelectric transition temperature or the melting temperature of the polymer. |
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