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Home  >  Journal list  >  Polymer Journal  >  Vol.45  No.9 (2013)  >  pp.921-928

Polymer Journal
<<Previous article Vol.45  No.9 (2013)   pp.921 - 928 Next article>>

Crystallization behavior and higher-order structure in miscible crystalline/crystalline polymer blends

Fuminori Arai1, Kazuya Shinohara1, Noriaki Nagasawa1, Hiroki Takeshita1, Katsuhiko Takenaka1, Masamitsu Miya1 and Tomoo Shiomi1
1Department of Materials Science and Technology, Nagaoka University of Technology, Nagaoka, Niigata, Japan

The crystallization behavior and higher-order structures of crystalline/crystalline miscible polymer blends composed of poly(vinylidene fluoride) (PVDF) and isotactic-poly(methyl methacrylate) (i-PMMA) were investigated using small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction techniques, as well as differential scanning calorimetry. When only the PVDF component was crystallized, the overall crystallization rate decreased with increasing i-PMMA composition and exhibited a bell-shaped temperature dependence. The long period increased with increasing i-PMMA content up to 0.5 wt. fr. and then decreased at 0.4 wt. fr. In the subsequent crystallization of i-PMMA, the overall crystallization rate was enhanced compared with that of the neat i-PMMA; this enhancement was attributed to the role of PVDF as a nucleating agent because the nucleation induction period was shortened. From the SAXS profiles, it was concluded that i-PMMA crystallized between the PVDF crystalline lamellae and that the long period between the PVDF crystalline lamellae was consequently expanded. For the crystallization of i-PMMA in the blend that contained 0.7 wt. fr. of PVDF, both the Avrami index and crystallinity were depressed, which suggested that the crystallization of i-PMMA was confined by the PVDF crystalline lamellae.


Keyword:
crystallization; crystallization rate; lamellar structure; polymer blend; SAXS

Received: October 02, 2012 , Revised: December 04, 2012
Accepted: December 06, 2012 , Published online: February 13, 2013
© 2013 The Society of Polymer Science, Japan

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