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首页> 外文期刊>ACS Macro Letters >Rheological Link Between Polymer Melts with a High Molecular Weight Tail and Enhanced Formation of Shish-Kebabs
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Rheological Link Between Polymer Melts with a High Molecular Weight Tail and Enhanced Formation of Shish-Kebabs

机译：聚合物熔化与高分子量尾部的流变链接，增强乳样kebabs的形成

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摘要

src="http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/amlccd/2017/amlccd.2017.6.issue-11/acsmacrolett.7b00718/20171115/images/medium/mz-2017-007183_0006.gif">Presence of an ultra high molecular weight (UHMw) fraction in flowing polymer melts is known to facilitate formation of oriented crystalline structures significantly. The UHMw fraction manifests itself as a minor tail in the molar mass distribution and is hardly detectable in the canonical characterization methods. In this study, alternatively, we demonstrate how the nonlinear extensional rheology reveals to be a very sensitive characterization tool for investigating the effect of the UHMw-tail on the structural ordering mechanism. Samples containing a UHMw-tail relative to samples without, exhibit a clear increase in extensional stress that is directly correlated with the crystalline orientation of the quenched samples. Extensional rheology, particularly, in combination with linear creep measurements, thus, enables the conformational evolution of the UHMw-tail to be studied and linked to the enhanced formation of oriented structures.
机译：src =“http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/amlccd/2017/amlccd.2017.6.issue-11/acsmacrolett.7b00718/20171115/images/medium/mz已知已知流动聚合物熔体中的超高分子量（UHMW）级分的颗粒显着形成取向的晶体结构的超高分子量（UHMW）级分。 UHMW馏分在摩尔质量分布中表现为少量尾部，并且在规范表征方法中几乎无法检测到。或者，在这项研究中，我们证明了非线性延伸流变学揭示的是一种非常敏感的表征工具，用于研究UHMW尾对结构排序机构的影响。含有UhmW-尾部相对于样品的样品，不具有猝灭应力的透明增加，其与淬火样品的晶体取向直接相关。延伸流变学，特别是与线性蠕变测量结合，因此，能够研究UHMW尾的构象演化和连接到增强的面向结构的形成。

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  • 来源
    《ACS Macro Letters》 |2017年第11期|共6页
  • 作者

    Sara L. Wingstrand; Bo Shen; Julie A. Kornfield; Kell Mortensen; Daniele Parisi; Dimitris Vlassopoulos; Ole Hassager;

  • 作者单位

    Technical University of Denmark Department of Chemical and Biochemcial Engineering Danish Polymer Center DK-2800 Kgs. Lyngby Denmark;

    California Institute of Technology Division of Chemistry and Chemical Engineering Pasadena California 91125 United States;

    California Institute of Technology Division of Chemistry and Chemical Engineering Pasadena California 91125 United States;

    University of Copenhagen Niels Bohr Institute X-ray and Neutron Science DK-2100 K?benhavn ? Denmark;

    Institute of Electronic Structure and Laser FORTH Heraklion 71110 Crete Greece;

    Institute of Electronic Structure and Laser FORTH Heraklion 71110 Crete Greece;

    Technical University of Denmark Department of Chemical and Biochemcial Engineering Danish Polymer Center DK-2800 Kgs. Lyngby Denmark;

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  • 正文语种 eng
  • 中图分类 有机化学;
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