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Formation of banded spherulites and the temperature dependence of the band space in olefin block copolymer

机译：带状球菌的形成和烯烃嵌段共聚物中带空间的温度依赖性

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The formation of banded spherulites, which is a representative morphological feature for polymer crystalline aggregates, has attracted great interest during the past few decades. In this study, the crystalline morphologies of a type of olefin block copolymer (OBC) at different crystallization temperatures were observed systematically. It was found that banded spherulites formed at comparatively higher temperatures and the temperature dependence of the band space in OBC-banded spherulites could be divided into two regions: it firstly increased continuously with crystallization temperature between 115 and 119 degrees C; while beyond 120 degrees C, the changing tendency of the band space became unapparent and irregular. Scanning electron microscopy and atomic force microscopy confirmed that the alternative negative and positive bands could be attributed to the alternative flat-on and edge-on lamellae in the spherulites. Through analyzing the change of lamellar thickness and long period with temperatures, we speculated that the formation of the intriguing change of band space might be ascribed to the unbalanced surface stress, which was closely correlated to the amorphous layers of the OBC lamellae. We believe that this study contributes to understanding the relationship between the crystalline structure and banding phenomenon for semi-crystalline block copolymers.
机译：形成带状的球质的形成，即聚合物结晶聚集体的代表性形态特征，在过去几十年中引起了极大的兴趣。在该研究中，系统地观察到不同结晶温度下的烯烃嵌段共聚物（OBC）的晶体形态的结晶形态。结果发现，在相对较高的温度下形成的带状球晶和带状球杆的带空间的带空间的温度依赖性可以分为两个区域：首先在115和119摄氏度之间连续增加结晶温度;虽然超过120度C，但频带空间的变化趋势变得不公平和不规则。扫描电子显微镜和原子力显微镜证实，替代的负极和正带可以归因于球晶中的替代平板和边缘薄片。通过分析层状厚度和长期的温度的变化，我们推测了带空间的有趣变化的形成可能归因于不平衡的表面应力，这与OBC薄片的无定形层密切相关。我们认为，该研究有助于了解半结晶嵌段共聚物的结晶结构和带状现象之间的关系。

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  • 来源
    《RSC Advances》 |2015年第54期|共9页
  • 作者

    Zhang Qinglong; Fan Jiashu; Feng Jiachun;

  • 作者单位

    Fudan Univ Collaborat Innovat Ctr Polymers &

    Polymer Composi Dept Macromol Sci State Key Lab Mol Engn Polymers Shanghai 200433 Peoples R China;

    Fudan Univ Collaborat Innovat Ctr Polymers &

    Polymer Composi Dept Macromol Sci State Key Lab Mol Engn Polymers Shanghai 200433 Peoples R China;

    Fudan Univ Collaborat Innovat Ctr Polymers &

    Polymer Composi Dept Macromol Sci State Key Lab Mol Engn Polymers Shanghai 200433 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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