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首页> 外文期刊>Science of advanced materials >In-Situ Synchrotron X-ray Scattering Studies of the Thermally-Induced Self-Assembly of High-Performance Aromatic Copolyesters
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In-Situ Synchrotron X-ray Scattering Studies of the Thermally-Induced Self-Assembly of High-Performance Aromatic Copolyesters

机译：高性能芳族共聚酯热诱导自组装的原位同步加速器X射线散射研究

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摘要

In-situ synchrotron small-angle X-ray scattering measurements and quantitative data analysis were used to investigate isothermal self-assembly in a series of high-performance poly(1,4-cyclohexyldimethylene-co-ethylene terephthalate)s (PCETs) enriched with 1,4-cyclohexanedimethanol (CHDM). Interestingly, the bulky CHDM units, which assumed a kinked chair conformation, formed lamellar crystals. The self-assembly process was governed by a nucleation and growth mechanism that depended on the degree of supercooling. Isothermal self-assembly occurred through a four-regime process. The structural evolution was driven mainly by a primary crystallization process, which contributed to crystal layer thickening, and in part by a secondary crystallization process during the later stages, which did not contribute to crystal layer thickness, to produce a lamellar structure. In addition to the primary crystals, highly imperfect small secondary crystals distinct from the lamellar crystals were observed to form. The secondary crystals formed only in the amorphous phases, including in the amorphous layer of the lamellar structure. Surprisingly, the minor ethylene glycol (EG) units tended to be excluded from the primary lamellar crystals.
机译：用原位同步加速器小角X射线散射测量和定量数据分析研究了一系列富含PFC的高性能聚（1,4-环己基二亚甲基-对苯二甲酸乙二醇酯）（PCET）的等温自组装。 1,4-环己烷二甲醇（CHDM）。有趣的是，笨重的CHDM装置（假定为扭结椅构型）形成了层状晶体。自组装过程受成核和生长机制的控制，而成核和生长机制取决于过冷的程度。等温自组装是通过四个过程进行的。结构的演化主要是由初级结晶过程驱动的，这有助于晶体层的增厚，而部分由后期阶段的次级结晶过程驱动，而这对晶体层的厚度没有贡献，从而产生了层状结构。除了初级晶体之外，还观察到形成了与片状晶体不同的高度不完美的小的次级晶体。次生晶体仅在非晶相中形成，包括在层状结构的非晶层中。出人意料的是，次要乙二醇（EG）单元往往被排除在主要层状晶体之外。

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  • 来源
    《Science of advanced materials》 |2014年第11期|2352-2357|共6页
  • 作者

    Young Yong Kim; Kyuyoung Heo; Kyeong Sik Jin; Jehan Kim; Jong Ryang Kim; In Sun Yoon; Moonhor Ree;

  • 作者单位

    Division of Advanced Materials Science, Department of Chemistry, Center for Electro-Photo Behaviors in Advanced Molecular Systems, Pohang Accelerator Laboratory, Polymer Research Institute, and BK School of Molecular Science, Pohang University of Science and Technology, Pohang, 790-784, Korea;

    Division of Advanced Materials Science, Department of Chemistry, Center for Electro-Photo Behaviors in Advanced Molecular Systems, Pohang Accelerator Laboratory, Polymer Research Institute, and BK School of Molecular Science, Pohang University of Science and Technology, Pohang, 790-784, Korea;

    Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, 790-784, Korea;

    Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, 790-784, Korea;

    SK Chemicals, Chemical Research Institute, Sampyung-dong, Bundang-gu, Seongnam, 440-300, Korea;

    SK Chemicals, Chemical Research Institute, Sampyung-dong, Bundang-gu, Seongnam, 440-300, Korea;

    Division of Advanced Materials Science, Department of Chemistry, Center for Electro-Photo Behaviors in Advanced Molecular Systems, Pohang Accelerator Laboratory, Polymer Research Institute, and BK School of Molecular Science, Pohang University of Science and Technology, Pohang, 790-784, Korea ,Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, 790-784, Korea;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Aromatic Copolysters; In-Situ X-ray Scattering; Calorimetry; Self-Assembly Behaviors; Comonomer Effect;

    机译：芳香共聚体;原位X射线散射量热法自组装行为;共聚单体效应;

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