Fabrication of poly(vinylidene fluoride) membrane via thermally induced phase separation using ionic liquid as green diluent

doi:10.1016/j.cjche.2020.01.011

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (5): 1415-1423.DOI: 10.1016/j.cjche.2020.01.011

• Materials and Product Engineering • Previous Articles Next Articles

Fabrication of poly(vinylidene fluoride) membrane via thermally induced phase separation using ionic liquid as green diluent

Xiaozu Wang¹, Xiaogang Li¹, Juan Yue¹, Yangming Cheng¹, Ke Xu¹, Qian Wang¹, Fan Fan¹, Zhaohui Wang^1,2, Zhaoliang Cui^1,2,3

1 State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
2 Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM), Nanjing Tech University, Nanjing 210009, China;
3 National Engineering Research Center for Special Separation Membrane, Nanjing Tech University, Nanjing 210009, China

Received:2019-06-06 Revised:2019-11-21 Online:2020-07-29 Published:2020-05-28
Contact: Zhaoliang Cui
Supported by:
The authors acknowledge the financial support of the National Natural Science Foundation of China (Grant No. 21606125), the Natural Science Foundation of Jiangsu Province (Grant No. BK20160984), the National Key R&D Program of China (Grant No. 2017YFC0403702), the Materials-Oriented Chemical Engineering State Key Laboratory Program (KL16-09), the open project program of Jiangsu Key Lab for Chemistry of Low-Dimensional Materials (JSKC17005), and the Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD).

Fabrication of poly(vinylidene fluoride) membrane via thermally induced phase separation using ionic liquid as green diluent

Xiaozu Wang¹, Xiaogang Li¹, Juan Yue¹, Yangming Cheng¹, Ke Xu¹, Qian Wang¹, Fan Fan¹, Zhaohui Wang^1,2, Zhaoliang Cui^1,2,3

1 State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
2 Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM), Nanjing Tech University, Nanjing 210009, China;
3 National Engineering Research Center for Special Separation Membrane, Nanjing Tech University, Nanjing 210009, China

通讯作者: Zhaoliang Cui
基金资助:
The authors acknowledge the financial support of the National Natural Science Foundation of China (Grant No. 21606125), the Natural Science Foundation of Jiangsu Province (Grant No. BK20160984), the National Key R&D Program of China (Grant No. 2017YFC0403702), the Materials-Oriented Chemical Engineering State Key Laboratory Program (KL16-09), the open project program of Jiangsu Key Lab for Chemistry of Low-Dimensional Materials (JSKC17005), and the Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD).

Abstract

Abstract: Ionic liquid (IL), 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6) as a new and environmentally friendly diluent was introduced to prepare poly(vinylidene fluoride) (PVDF) membranes via thermally induced phase separation (TIPS). Phase diagram of PVDF/[BMIM]PF6 was measured. The effects of polymer concentration and quenching temperature on the morphologies, properties, and performances of the PVDF membranes were investigated. When the polymer concentration was 15 wt%, the pure water flux of the fabricated membrane was up to nearly 2000 L·m^-2·h^-1, along with adequate mechanical strength. With the increasing of PVDF concentration and quenching temperature, mean pore size and water permeability of the membrane decreased. SEM results showed that PVDF membranes manufactured by ionic liquid (BMImPF6) presented spherulite structure. And the PVDF membranes were represented as β phase by XRD and FTIR characterization. It provides a new way to prepare PVDF membranes with piezoelectric properties.

Key words: Ionic liquid, Poly(vinylidene fluoride) membrane, Thermally induced phase separation

摘要： Ionic liquid (IL), 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6) as a new and environmentally friendly diluent was introduced to prepare poly(vinylidene fluoride) (PVDF) membranes via thermally induced phase separation (TIPS). Phase diagram of PVDF/[BMIM]PF6 was measured. The effects of polymer concentration and quenching temperature on the morphologies, properties, and performances of the PVDF membranes were investigated. When the polymer concentration was 15 wt%, the pure water flux of the fabricated membrane was up to nearly 2000 L·m^-2·h^-1, along with adequate mechanical strength. With the increasing of PVDF concentration and quenching temperature, mean pore size and water permeability of the membrane decreased. SEM results showed that PVDF membranes manufactured by ionic liquid (BMImPF6) presented spherulite structure. And the PVDF membranes were represented as β phase by XRD and FTIR characterization. It provides a new way to prepare PVDF membranes with piezoelectric properties.

关键词: Ionic liquid, Poly(vinylidene fluoride) membrane, Thermally induced phase separation

Xiaozu Wang, Xiaogang Li, Juan Yue, Yangming Cheng, Ke Xu, Qian Wang, Fan Fan, Zhaohui Wang, Zhaoliang Cui. Fabrication of poly(vinylidene fluoride) membrane via thermally induced phase separation using ionic liquid as green diluent[J]. Chinese Journal of Chemical Engineering, 2020, 28(5): 1415-1423.

References

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Fabrication of poly(vinylidene fluoride) membrane via thermally induced phase separation using ionic liquid as green diluent

Fabrication of poly(vinylidene fluoride) membrane via thermally induced phase separation using ionic liquid as green diluent

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