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Indexed by:期刊论文

Date of Publication:2016-07-10

Journal:JOURNAL OF APPLIED POLYMER SCIENCE

Included Journals:SCIE、EI

Volume:133

Issue:26

ISSN No.:0021-8995

Key Words:composites; crystallization; fibers; morphology; surfaces and interfaces

Abstract:The crystallization behavior of poly(vinylidene fluoride) (PVDF) and transcrystallization in carbon fiber (CF)/PVDF composite were investigated under a temperature gradient. The crystallization temperature (T-c) was controlled in the range of 110-180 degrees C. For neat PVDF, the results showed that exclusive phase formed at T-c above 164 degrees C, but coexisted with phase at T-c ranging from 137 to 160 degrees C. The promotion of phase to nucleation of phase at low T-c was observed for the first time. For CF/PVDF composite, a cylindrical transcrystalline (TC) layer formed on the surface of CF when T-c was between 137 and 172 degrees C. The TC layer was exclusively composed of phase at T-c above 164 degrees C. The hybrid nucleation was dominated by phase though some phase nuclei emerged on the surface of CF when T-c was in the range of 144-160 degrees C. As T-c decreased, competition between the hybrid nucleation of and phase became more intense. The phase nuclei was soon circumscribed by the rapidly developed phase when T-c was below 144 degrees C. Furthermore, some phase nuclei were induced at the surface of the phase TC layer, and developed into phase TC layer when T-c was in the range of 146-156 degrees C, which resulted in a doubled TC layer of and phase at the interface of the composite. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43605.