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Polarity-induced ferroelectric crystalline phase in electrospun fibers of poly(vinylidene fluoride)/polyacrylonitrile blends

Published online by Cambridge University Press:  21 March 2012

Run Su
Affiliation:
College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, People’s Republic of China; and Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202
Ganji Zhong
Affiliation:
College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, People’s Republic of China; and Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202
Qiang Fu
Affiliation:
College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
Lifeng Zhang
Affiliation:
Department of Chemistry, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701-3995
Hao Fong*
Affiliation:
Department of Chemistry, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701-3995
Lei Zhu*
Affiliation:
Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202
*
a)Address all correspondence to these authors. e-mail: Hao.Fong@sdsmt.edu
b)e-mail: lxz121@case.edu
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Abstract

In this study, crystal orientation and polymorphism formation in electrospun poly(vinylidene fluoride) (PVDF)/polyacrylonitrile (PAN) blend fibers after melt-recrystallization were studied. To achieve uniform alignment of electrospun fibers, mechanical stretching was applied to the as-spun nonwoven fibers at 110 °C. Pure ferroelectric β-PVDF crystals in the PAN matrix were achieved, and both polar β-PVDF and polar PAN crystals oriented with their chain axes parallel to the fiber axes. After melt-recrystallization of PVDF, a significant amount of ferroelectric β crystals was retained in addition to the formation of nonpolar α crystals. A polarized Fourier transform infrared study showed that the degree of orientation of ferroelectric β-PVDF crystals was higher than that of nonpolar α crystals, suggesting that the β-PVDF crystals should form at the PVDF/PAN interfaces because of strong dipolar and hydrogen bonding interactions between vinylidene fluoride and acrylonitrile units. The nonpolar α-PVDF crystals should form in the center of PVDF domains.

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Articles
Copyright
Copyright © Materials Research Society 2012

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