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Erschienen in: Journal of Polymer Research 12/2013

01.12.2013 | Original Paper

Effect of preparation conditions on the morphology, polymorphism and mechanical properties of polyvinylidene fluoride membranes formed via thermally induced phase separation

verfasst von: Jie Liu, Xiaolong Lu, Chunrui Wu, Chen Zhao

Erschienen in: Journal of Polymer Research | Ausgabe 12/2013

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Abstract

Polyvinylidene fluoride (PVDF) membranes were prepared from PVDF/sulfolane (SFL) solutions using the thermally induced phase separation (TIPS) method. The effects of PVDF concentration and dissolving temperature on the morphology, polymorphism and mechanical properties of such prepared membranes were investigated. Field emission scanning electron microscopy (FESEM) was performed to observe the membrane morphology, and X-ray diffraction (XRD) along with differential scanning calorimetry (DSC) was used to analyze the crystalline structure and thermal behaviors of membranes, respectively. Based on the experimental results, PVDF mainly crystallized into α phase in the overall membranes for all the investigated cases. As the PVDF concentration in the casting solution was raised, the total crystallinity and tensile strength of the membranes increased, while the porosity decreased. With the increase in dissolving temperature, the total crystallinity and porosity of the membranes increased slightly; however, the tensile strength decreased. The FESEM photomicrographs of cross-sections of membranes indicated that an interconnected bi-continuous structure was obtained in the PVDF/SFL (30 wt.% PVDF) system with a dissolving temperature of 120 °C, while the rest of the investigated membranes showed spherical or irregular particle structure, consequently, the tensile strength was improved from 3.5 to 7.5 MPa, and the energy consumption of membrane preparation was reduced.

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Metadaten
Titel
Effect of preparation conditions on the morphology, polymorphism and mechanical properties of polyvinylidene fluoride membranes formed via thermally induced phase separation
verfasst von
Jie Liu
Xiaolong Lu
Chunrui Wu
Chen Zhao
Publikationsdatum
01.12.2013
Verlag
Springer Netherlands
Erschienen in
Journal of Polymer Research / Ausgabe 12/2013
Print ISSN: 1022-9760
Elektronische ISSN: 1572-8935
DOI
https://doi.org/10.1007/s10965-013-0321-3

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