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首页> 外文学位 >Effects of chain architecture on the mechanical response of glassy/semicrystalline block copolymers: CEC versus CECEC lamellae.
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Effects of chain architecture on the mechanical response of glassy/semicrystalline block copolymers: CEC versus CECEC lamellae.

机译：链结构对玻璃态/半晶态嵌段共聚物的机械响应的影响：CEC与CECEC薄片。

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摘要

In this work, we investigated the effects of molecular architecture on the mechanical response of glassy/semicrystalline block copolymers. Poly(cyclohexylethylene) (C) comprises the glassy blocks while the semicrystalline blocks are poly(ethylene) (E). This research specifically compared the mechanical response of lamellar structured triblock CEC and pentablock CECEC copolymers. General material response was measured and a detailed analysis of the microstructure was performed. The triblock and pentablock copolymers were investigated in the multi-grained and single-grained state; the single-grained samples were created by the application of an oscillatory shear field that induced long-range lamellar orientation. Mechanical testing of the single-grained specimens enabled us to isolate the effects of the morphological structure on the physical properties of these materials. Additionally, this work helps us to understand the effects of processing induced orientation of the lamellae on the final mechanical properties of block copolymers.; Basic tensile tests were carried out to determine the yield stress, elastic modulus and strain-to-failure. Small angle x-ray scattering (SAXS) and transmission electron microscopy (TEM) were utilized to image the changes in the lamellar structure resulting from the various processing conditions and mechanical tests the samples underwent. In addition, specimens were subjected to SAXS at select stages of the deformation process. This enabled us to monitor changes in alignment and/or breakup of the lamellae as a function of strain-induced plastic deformation.
机译：在这项工作中，我们调查了分子结构对玻璃状/半结晶嵌段共聚物的机械响应的影响。聚（环己基乙烯）（C）包含玻璃状嵌段，而半结晶嵌段为聚（乙烯）（E）。这项研究专门比较了层状结构的三嵌段CEC和五嵌段CECEC共聚物的机械响应。测量了一般材料的响应并进行了微观结构的详细分析。在多颗粒和单颗粒状态下研究了三嵌段和五嵌段共聚物。单粒样品是通过施加振荡剪切场产生的，该振荡剪切场引起长距离层状取向。对单粒样品的机械测试使我们能够分离出形态结构对这些材料的物理性能的影响。另外，这项工作有助于我们理解加工引起的片晶取向对嵌段共聚物最终机械性能的影响。进行了基本的拉伸试验，以确定屈服应力，弹性模量和破坏应变。利用小角度X射线散射（SAXS）和透射电子显微镜（TEM）来成像由各种加工条件引起的层状结构的变化，并对样品进行机械测试。此外，在变形过程的选定阶段对样本进行SAXS处理。这使我们能够根据应变引起的塑性变形来监测薄片排列和/或破裂的变化。

著录项

  • 作者

    Hermel, Theresa Jane.;

  • 作者单位

    University of Minnesota.;

  • 授予单位 University of Minnesota.;
  • 学科 Engineering Materials Science.; Chemistry Polymer.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 197 p.
  • 总页数 197
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;高分子化学（高聚物）;
  • 关键词

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