Home The effect of casting solution composition on surface structure and performance of poly(vinylidene fluoride)/multi-walled carbon nanotubes (PVDF/MWCNTs) hybrid membranes prepared via vapor induced phase separation
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The effect of casting solution composition on surface structure and performance of poly(vinylidene fluoride)/multi-walled carbon nanotubes (PVDF/MWCNTs) hybrid membranes prepared via vapor induced phase separation

  • Nana Li EMAIL logo , Zhe Chang , Xiuzhen Zhao and Changfa Xiao
Published/Copyright: August 6, 2016
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Abstract

In this work, the poly(vinylidene fluoride)/multi-walled carbon nanotubes (PVDF/MWCNTs) hybrid membranes were obtained through vapor induced phase separation (VIPS). In addition, the effects of solution composition on crystal behavior, elemental composite, morphology and hydrophilicity of membranes surface and the viscosity of casting solution were analyzed. The results of field emission scanning electron microscopy and X-ray photoelectron spectroscopy showed that the rough porous surface could be built in all hybrid membranes due to the slower double diffusion mechanism of the VIPS process, which also provided enough time for MWCNTs to move to the surface and be enriched there, to ensure the lowest surface free energy. Furthermore, other analysis displayed that both adding tiny amounts of MWCNTs and a low concentration of PVDF were favorable to the growth and aggregation of PVDF, which were put down to the adverse effect of hydrophobic MWCNTs on the thermodynamic compatibility of polar casting solution, the less nucleation points and the good fluidity with lower concentration of polymer. Then, the diameter of PVDF spherical particles and the membrane surface roughness increased, whereas the hydrophilicity of membrane surface declined effectively.

Award Identifier / Grant number: 51503144

Funding statement: The authors thank the National Natural Science Foundation of China (51503144), the Specialized Research Fund for the Doctoral Program of Higher Education (20131201120003), the Science and Technology Plans of Tianjin (15PTSYJC00230) and the Program Scholars and Chang-jiang Innovative Research Team in the University of Ministry of Education of China (IRT13084) for the financial support

Acknowledgments

The authors thank the National Natural Science Foundation of China (51503144), the Specialized Research Fund for the Doctoral Program of Higher Education (20131201120003), the Science and Technology Plans of Tianjin (15PTSYJC00230) and the Program Scholars and Chang-jiang Innovative Research Team in the University of Ministry of Education of China (IRT13084) for the financial support.

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Received: 2016-4-15
Accepted: 2016-6-20
Published Online: 2016-8-6
Published in Print: 2017-5-1

©2017 Walter de Gruyter GmbH, Berlin/Boston

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