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聚合物分子具有内部各向异性的物理特性,从而导致聚合物整体在大分子取向时呈现各向异性.为克服形态学超分子结构在评价这一特性时带来的误差,作者通过胶凝/结晶作用,制取超拉伸聚乙烯和聚丙烯薄膜,使之具有近乎完美的分子取向度及结晶度的形态,可以使得测量结果更为精确。利用广角X射线衍射(WAXD),直接测定了高取向聚乙烯和聚丙烯的结晶格子模量。在此基础上,测量并讨论了高取向聚合物结晶格子模量与杨氏模量、取向度、结晶度、温度之间的相互关系,以及在晶体色散研究中的一些现象与机理,从而澄清了聚乙烯与聚烯内部各向异性的几个特征。同时还研究了超拉伸聚乙烯的动态弹性模量、动态损耗模量和凝胶薄膜的力学性能。
Polymer molecules with internal anisotropic physical properties, resulting in the polymer in the overall orientation of the polymer anisotropy To overcome the morphological supramolecular structure in the evaluation of this characteristic error, the author through the gel / Crystallization, the preparation of super-stretch polyethylene and polypropylene film, so that it has almost perfect molecular orientation and crystallinity of the form, can make the measurement more accurate. The crystal lattice modulus of high orientated polyethylene and polypropylene was directly determined by wide angle X-ray diffraction (WAXD). On this basis, the relationship between the lattice modulus and the Young’s modulus, orientation degree, crystallinity and temperature of high-orientation polymer and the phenomena and mechanism in the study of crystal dispersion were measured and discussed. Several characteristics of the internal anisotropy of polyethylene and polyene. The dynamic elastic modulus, dynamic loss modulus and the mechanical properties of the gel films were also studied.