PDMS在阶跃应变中松弛模量与动态剪切中广义弹性模量的比较  

Comparison of the Relaxation Moduli in Step Strain and the Generalized Elastic Moduli in Dynamic Shear of Polydimethylsiloxane

作　　者：廖华勇[1] 范毓润[2] 

机构地区：[1]江苏工业学院常州市高分子材料重点实验室,江苏常州213164 [2]浙江大学流体传动及控制国家重点实验室,浙江杭州310027

出　　处：《材料科学与工程学报》2009年第1期72-74,82,共4页Journal of Materials Science and Engineering

基　　金：江苏工业学院青年教师科研基金资助项目(ZMF07020038)

摘　　要：本文采用旋转流变仪对比研究了聚二甲基硅氧烷(PDMS)在两平行板间的动态剪切流动和阶跃应变的关系,应用Cho等人提出的应力分解方法考察了大振幅剪切流中的广义弹性模量,发现在线性区及非线性区的一部分,随着角频率ω的增加,在时间尺度为t=1/ω时,大振幅剪切流中的广义弹性模量逐渐接近阶跃应变中的松弛模量。The relationship between dynamic shear and step strain of the melt of polydimethylsiloxane （PDMS） was studied experimentally by using a rotational rheorneter with parallel plates fixtures. The generalized elastic modulus in large amplitude oscillatory shear was investigated by using the stress decomposition method proposed by Cho et al. It was found that in linear and the early part of nonlinear regime, as the angular frequency ω increases, at the time scale t = 1/ω the generalized elastic modulus in large amplitude oscillatory shear approaches to the shear relaxation modulus in step strain.

关 键 词：大振幅剪切流 阶跃应变 广义弹性模量 松弛模量 壁面滑移 

分 类 号：O373[理学—流体力学]