项目名称: 线性纠缠高分子的弛豫过程的研究
项目编号: No.11304037
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 数理科学和化学
项目作者: 侯吉旋
作者单位: 东南大学
项目金额: 25万元
中文摘要: 从高分子熔体的微观或介观结构去理解和预言其宏观粘弹性是高分子物理中一个重要课题。本项目拟模拟处于平衡态的和经历了阶跃形变的珠子-弹簧高分子熔体,并给出一系列弛豫过程的模拟数据。这些数据可以让我们探究高分子链的动力学弛豫过程。利用已知的非纠缠链的Rouse动力学性质和通过原始路径分析法得到的纠缠高分子熔体的纠缠长度,使用我们的模拟数据可以对不同的管道模型进行无调节参数地比较。通过对Likhtman和McLeish的理论的修正,我们将对线性纠缠的高分子熔体建立自洽的定量的理论,并预期能在定性和定量上与模拟和实验数据符合得很好。
中文关键词: 高分子;管道理论;粘弹性;弛豫过程;爬行
英文摘要: An important issue of polymer physics is to understand and predict the macro viscoelastic properties of polymer melt from the micro- or mesoscopic information. This proposal is aimed to present an extensive set of simulation results for the stress relaxation in equilibrium and step-strained bead-spring polymer melts. The data will allow us to explore the chain relaxation dynamics. Using the known Rouse mobility of unentangled chains and the melt entanglement length determined via the primitive path analysis of the microscopic topological state of our systems, it is possible to performed parameter-free tests of several different tube models. By correcting Likhtman-McLeish theory, we will present a transparent quantitative theory for linear dynamics of linear entangled polymer melts which is supposed to fit the simulation and experimental data excellently well.
英文关键词: polymer;tube theory;viscoelasty;relaxation process;reptation