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The effect of hard block content on the orientation and mechanical properties of olefin block copolymer films as obtained via melt stretching

机译：硬嵌段含量对通过熔体拉伸获得的烯烃嵌段共聚物膜的取向和力学性能的影响

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摘要

In this study, the orientation, structure and mechanical performance of a series of uniaxially oriented films based on olefin block copolymers (OBC) have been investigated in terms of the differences in hard block content and draw ratio (DR). Three OBCs with different hard block contents of 35 wt%, 25 wt% and 12 wt% were used. For un-stretched films, a change from close-packed spherulites into tiny crystallites is observed with decreasing hard block content, accompanied by an almost linear decrease in crystallinity. However, the change in mechanical properties does not follow the same path, with obviously higher tensile strength and modulus for OBC-35, but a lower and almost the same tensile strength and modulus for OBC-25 and OBC-12, in spite of the big difference in hard block content and crystallinity between them. For melt-stretched films, the degree of orientation of the amorphous phase is almost the same and slightly increases with the increase in the draw ratio for the three OBCs, disregarding their hard block contents. Crystalline orientation and shish content are much higher for OBC-35, and an obvious increase is seen as the draw ratio increases from 4.95 to 8, corresponding to the sharp increase in Young's modulus and stress. For OBC-25 and OBC-12, similar crystalline orientation and shish content are seen, which increase linearly with draw ratio and are consistent with the linear increase in modulus and stress as the draw ratio increases. Our study demonstrates the importance of the hard block content of OBC to determine the mechanical properties and the response to external stretching. A critical hard block content exists (in this case 35 wt%), above which a strong network is constructed by the hard block crystalline phase, resulting in a higher tensile strength and modulus. This strong network is destroyed as the draw ratio reaches a certain value (herein, 4.95 to 8), leading to an obvious increase in crystalline orientation, as well as a sharp increase in tensile strength and modulus. When the hard block is below the critical content (herein, 25 wt% and 12 wt%), the network constructed by the hard block is weak and less dependent on its content.
机译：在该研究中，基于烯烃嵌段共聚物（OBC）的一系列单轴取向薄膜的取向，结构和机械性能已经在硬嵌段含量和拉伸比（DR）的差异方面研究。使用具有35wt％，25wt％25wt％的不同硬阻滞含量的三个OBC。对于未拉伸的薄膜，通过降低硬嵌段含量，观察到从近填充的球晶素变为微晶的变化，伴随着结晶度的几乎线性降低。然而，在机械性能的变化不遵循相同的路径，与明显更高的拉伸强度和模量为OBC-35，但较低的和几乎相同的抗拉强度和弹性模量为OBC-25和OBC-12，尽管该它们之间的硬块内容和结晶度大的差异。对于熔化的薄膜，无定形相的取向程度几乎相同并且随着三个OBC的拉伸比率的增加几乎相同并且略微增加，忽略了它们的硬嵌段含量。 OBC-35的结晶取向和膜含量要高得多，并且视表现为下降比率从4.95增加到8，对应于杨氏模量和应力的急剧增加。对于OBC-25和OBC-12，可以看到类似的结晶取向和膜含量，其用拉伸比线性增加，并且随着拉伸比增加而与模量和应力的线性增加一致。我们的研究表明，OBC硬块含量的重要性确定机械性能和对外部拉伸的响应。存在临界硬块内容（在这种情况下，在这种情况下，在35wt％）中，上述强型网络由硬块结晶相构造，导致较高的拉伸强度和模量。这种强大的网络被破坏，因为拉伸比率达到一定的值（本文，4.95至8），导致结晶取向的明显增加，以及抗拉强度和模量的急剧增加。当硬块低于关键内容（这里，25wt％和12wt％）时，由硬块构建的网络弱并且较少依赖于其内容。

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  • 来源
    《RSC Advances》 |2015年第100期|共9页
  • 作者

    Zhao Yongsheng; Zhu Yanling; Sui Guopeng; Chen Feng; Zhang Qin; Fu Qiang;

  • 作者单位

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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