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Issue 44, 2018
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Controlling crystal polymorphism of isotactic poly(1-butene) by incorporating long chain branches

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Abstract

Isotactic poly(1-butene) (iPB-1) is a high performance plastic with outstanding properties, such as flexibility, superior creep, environmental stress cracking and abrasive resistance. However, it exhibits a complex crystal polymorphism and polymorphic transformation behavior, which has limited its commercial development. In this paper, the incorporation of long chain branches (LCBs) causes coil contraction in the melt, which favors the direct melt-crystallization of form III that was generally crystallized from solutions and made of unconventional highly twined lamellae. Consequently, low-to-moderately branched iPB-1 samples as-crystallize from the melt into mixtures of form II and form III by compression-molding and fast cooling of the melt to room temperature, and the fraction of crystals of form III (fIII) increases with increasing concentration of LCBs, whereas highly branched samples can as-crystallize into pure form III with uniform crystal size distribution. The corresponding thermomechanical properties can be modified by controlling fIII.

Graphical abstract: Controlling crystal polymorphism of isotactic poly(1-butene) by incorporating long chain branches

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Publication details

The article was received on 01 Sep 2018, accepted on 25 Oct 2018 and first published on 26 Oct 2018


Article type: Communication
DOI: 10.1039/C8SM01793J
Citation: Soft Matter, 2018,14, 8872-8878
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    Controlling crystal polymorphism of isotactic poly(1-butene) by incorporating long chain branches

    A. Maimaitiming, M. Zhang, J. Hu and G. Wu, Soft Matter, 2018, 14, 8872
    DOI: 10.1039/C8SM01793J

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