Crystallization behavior and hydrophilicity of poly (vinylidene fluoride) (PVDF)/poly (styrene-<Emphasis Type="Italic">co</Emphasis>-acrylonitrile) (SAN) blends |
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Authors: | Wenzhong Ma Jun Zhang Shuangjun Chen Xiaolin Wang |
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Institution: | (1) College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, 210009, China;(2) Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China |
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Abstract: | Poly (styrene-co-acrylonitrile) (SAN) is a hydrophilic non-crystalline copolymer, which is initially used in this paper to improve the hydrophilicity
of poly (vinylidene fluoride) (PVDF). Investigation of the crystallization behavior of PVDF/SAN blends showed that the samples
presented only α phase regardless of SAN content as cooling from the melt. A double-melting phenomenon was related to the
perfection or crystal size of PVDF crystals. As the SAN content is increasing, crystallization of PVDF was limited, leading
to a decreased crystallinity and lamellar growth. Besides, the hydrophilicity of PVDF was improved by blending with SAN. The
sample containing 70 wt.% SAN performed a similar surface property of the neat SAN owing to the besieging of the PVDF phase
by SAN. Observed from the cross section of the blends, PVDF/SAN blends were partially miscible with less than 50 wt.% SAN
addition. As the SAN content was more than 50 wt.%, the crystalline PVDF particles clearly dispersed in the amorphous matrix. |
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Keywords: | Crystallization Blends Hydrophilicity Poly (vinylidene) fluoride (PVDF) |
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