期刊
POLYMER INTERNATIONAL
卷 68, 期 3, 页码 418-427出版社
WILEY
DOI: 10.1002/pi.5725
关键词
block copolymer; blends; morphology; self-assembly; crystallization
A polydimethylsiloxane-block-poly(methyl methacrylate) (PDMS-b-PMMA) diblock copolymer was synthesized by the atom transfer radical polymerization method and blended with a high-molecular-weight poly(vinylidene fluoride) (PVDF). In this A-b-B/C type of diblock copolymer/homopolymer system, semi-crystallizable PVDF (C) and PMMA (B) block are miscible due to favorable intermolecular interactions. However, the A block (PDMS) is immiscible with PVDF and therefore generates nanostructured morphology via self-assembly. Crystallization study reveals that both alpha and gamma crystalline phases of PVDF are present in the blends with up to 30 wt% of PDMS-b-PMMA block copolymer. Adding 10 wt% of PVDF to PDMS-b-PMMA diblock copolymer leads to worm-like micelle morphology of PDMS of 10 nm in diameter and tens of nanometers in length. Moreover, morphological results show that PDMS nanostructures are localized in the inter-fibrillar region of PVDF with the addition of up to 20 wt% of the block copolymer. Increase of PVDF long period by 45% and decrease of degree of crystallization by 34% confirm the localization of PDMS in the PVDF inter-fibrillar region. (c) 2018 Society of Chemical Industry
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