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The Influence of DMDBS on Crystallization Behavior and Crystalline Morphology of Weakly-Phase-Separated Olefin Block Copolymer

Polymers, 2019-03, Vol.11 (3), p.552 [Peer Reviewed Journal]

2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;2019 by the authors. 2019 ;ISSN: 2073-4360 ;EISSN: 2073-4360 ;DOI: 10.3390/polym11030552 ;PMID: 30960535

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  • Title:
    The Influence of DMDBS on Crystallization Behavior and Crystalline Morphology of Weakly-Phase-Separated Olefin Block Copolymer
  • Author: Zhao, Yongsheng ; Yao, Cheng ; Chang, Tao ; Zhu, Yanling
  • Subjects: Behavior ; Block copolymers ; Crystal structure ; Crystallinity ; Crystallization ; DMDBS ; Graphene ; Mechanical properties ; Miscibility ; Molecular weight ; Morphology ; nucleating agent ; olefin block copolymer (OBC) ; Physical properties ; Polyethylene ; polymer crystallization ; Shear tests ; Sorbitol ; Spectrum analysis ; Spherulites ; Temperature ; Viscoelasticity
  • Is Part Of: Polymers, 2019-03, Vol.11 (3), p.552
  • Description: Olefin block copolymer (OBC), with its low hard segments, can form unique space-filling spherulites other than confined-crystallization morphologies, mainly due to its weak phase-separation. In this work, 1,3;2,4-Bis(3,4-dimethylbenzylidene) sorbitol (DMDBS), a well-known nucleating agent, was used to tailor the crystallization behavior and crystalline morphology of OBC. It was found that DMDBS can precipitate within an OBC matrix and self-assemble into crystalline fibrils when cooling from the melt. A non-isothermal crystallization process exhibited an increased crystallization rate and strong composition dependence. During the isothermal crystallization process, DMDBS showed a more obvious nucleating efficiency at a higher crystallization temperature. OBC showed typical spherulites when DMDBS was added. Moreover, a low addition of DMDBS significantly decreased the crystal size, while a large addition of DMDBS induced aggregates, due to the limited miscibility of DMDBS with OBC. The efficient nucleating effect of DMDBS on OBC led to an increased optical transparency for OBC/DMDBS composites.
  • Publisher: Switzerland: MDPI AG
  • Language: English
  • Identifier: ISSN: 2073-4360
    EISSN: 2073-4360
    DOI: 10.3390/polym11030552
    PMID: 30960535
  • Source: Freely Accessible Journals
    PubMed Central (Open access)
    DOAJ Directory of Open Access Journals
    AUTh Library subscriptions: ProQuest Central
    ROAD: Directory of Open Access Scholarly Resources
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