Modelling of Deformation Behavior of Micro-Mezo-Macroscopic Scale of Glassy Polymers

玻璃态聚合物微观-介观-宏观尺度变形行为的建模

基本信息

批准号：
07555032
负责人：
TOMITA Yoshihiro
金额：
$ 5.7万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

In the development of a constitutive model of deformation behavior for a glassy polymer, molecular chain network theories have been developed to take account of the strain-induced anisotropy due to the alignment of the molecular chains and the changes in the number of entangled points. However, the suitable constitutive equation which can duplicate the general deformation behavior of polymeric materials and relationship betweenn the micro-and macroscopic behaviors of polymeric materials, that have hierarchical structures at successive molecular to macrolevels, have not been clarified vet.In this work, a new molecular chain network model, nonaffine model, which allows the change in the number of entangled points due to the thermal activation caused by the temperature change and the pullout of the molecular chain from the entangled points by local deformation. An identification method employing both experiments and computational simulation has been developed and thus established constitu … More tive equation has been approved through the computational prediction of experimental results. Furthermore, the peculiar instability propagation behavior observed in the tensile deformation as well as in the shear deformation under different deformation conditions.Next, in order to estabish the hierarchical constitutive model covering the response of molecular structure of mononer leading to deformation on a mezzo-and macroscopic deformation behavior, we applied AFM and clarified the relationship between the micro-and macroscopic behaviors. For highly oriented ultrahigh molecular weight polyethylene, (UHMW-PE), hierarchical structures with scales from microns to angstroms were observed such as microfibril structure aligned along the drawing direction, and nanofibril structure with dozens of nanometers. On the molecular level, regular chain pattern is formed on the surface of the nanofibril structure. The observation of microscopic surface profiles of PC,a glassy polymer, under uniaxial tension with neck propagation has clarified that the formation of microfibril structures aligned along the tensile direction on the surface and the clear delay in the rotation of aligned microfibril structures with rsepect to that of principal direction of plastic stretch due to shear strain, which suggests the necessity of the establishment of the nonassociative frame work for the constitutive equation. Less

在开发玻璃聚合物变形行为的组成型模型时，由于分子链的比对以及纠缠点的数量变化，已经开发了分子链网络理论来考虑应变诱导的各向异性。 However, the suitable constitutive equation which can duplicate the general deformation behavior of polymeric materials and relationship between the micro-and macroscopic behaviors of polymeric materials, that have hierarchical structures at successful molecular to macrolevels, have not been clarified vet.In this work, a new molecular chain network model, nonaffine model, which allows the change in the number of entangled points due to the thermal activation caused by the temperature change and the通过局部变形从纠缠点上拉出分子链。已经开发了一种采用实验和计算模拟的识别方法，因此建立了构造……通过实验结果的计算预测，已经批准了更具影响的方程式。 Furthermore, the peculiar instability propagation behavior observed in the tensile deformation as well as in the shear deformation under different deformation conditions.Next, in order to estabish the hierarchical constructive model covering the response of molecular structure of mononer leading to deformation on a mezzo-and macroscopic deformation behavior, we applied AFM and clarified the relationship between the micro-and macroscopic behaviors.对于高度定向的超高分子量聚乙烯（UHMW-PE），观察到具有从微米到埃斯特罗姆斯的尺度的分层结构，例如沿着图方向排列的微纤维结构，以及数十个纳米计的纳米纤维结构。在分子水平上，纳米纤维结构的表面形成了常规链图。在单轴张力和颈部传播的单轴张力下，PC的显微镜表面曲线的观察已经澄清了，沿表面上的张力方向对齐的微纤维结构的形成，以及对塑料的主要方向旋转的塑料方向，这是对塑料的主要方向的旋转，并暗示了对塑料的范围，这是造成的，这暗示了这种范围的范围，这是造成的。构成方程。较少的