Parallel superposition in entangled polydisperse polymer melts: Experiments and theory
Parallel superposition in entangled polydisperse polymer melts: Experiments and theory
复制标题
缠结多分散聚合物熔体中的平行叠加：实验与理论
DOI：
10.1122/1.2771175
复制
发表时间：
2007
影响因子：
3.3
通讯作者：
G. Ianniruberto
中科院分区：
文献类型：
--
作者：
E. Somma;O. Valentino;G. Titomanlio;G. Ianniruberto
这里使用平行叠加实验来对处于缠结状态的商用多分散聚合物熔体进行线性和非线性流变表征。在振荡小幅度的限制下，我们（据我们所知第一次）关注时间-温度叠加原理。随着振荡幅度的增加，存储模量和损耗模量变得与幅度相关，其幅度随背景流的强度而变化。将实验结果与最近基于分子的本构方程的预测进行比较，以验证方程本身并根据本构方程中解释的分子机制解释数据。
Parallel superposition experiments are used here for the linear and nonlinear rheological characterization of a commercial polydisperse polymer melt in the entangled state. In the limit of small amplitude of the oscillations, we focus (to our knowledge for the first time) on the time-temperature superposition principle. With increasing oscillation amplitudes, the storage and loss moduli become amplitude-dependent at amplitudes which vary with the strength of the background flow. Experimental results are compared with predictions of a recent molecularly-based constitutive equation in order to validate the equation itself as well as to interpret the data in terms of the molecular mechanisms accounted for in the constitutive equation.