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Molecular Mobility and Phase Composition in Polyolefins: From Fundamental to Applied Research

机译:聚烯烃的分子迁移率和相组成:从基础到应用研究

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Molecular mobility, phase composition and morphology of polyethylenes (PE), polypropylenes (PP) and random poly(ethylene-co-propylene) (PPR) were studied by solid-state low-field ~1H NMR, X-ray, DSC and microscopy methods. Influence of the following factors on the phase composition and molecular mobility is discussed: (1) the effect of the amount and the type of comonomers in PE and PP chains, (2) thermal aging, and (3) deformation. Small changes in the chemical composition, thermal history and mechanical load can significantly influence molecular mobility in the amorphous phase. A series of studies by the author shows that solid-state NMR provides a unique and complementary tool to traditional methods in obtaining information about physical structures and local dynamics in polyolefins. This information is useful to achieve a better understanding of deformation behavior of this class of polymers.
机译:通过固态低场〜1H NMR,X射线,DSC和显微镜研究了聚乙烯(PE),聚丙烯(PP)和无规聚(乙烯-共-丙烯)(PPR)的分子迁移率,相组成和形貌方法。讨论了以下因素对相组成和分子迁移率的影响:(1)PE和PP链中共聚单体的数量和类型的影响,(2)热老化,和(3)变形。化学成分,热历史和机械负荷的细微变化会显着影响非晶相中的分子迁移率。作者进行的一系列研究表明,固态NMR为获取有关聚烯烃的物理结构和局部动力学信息的传统方法提供了独特而互补的工具。此信息有助于更好地了解此类聚合物的变形行为。

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