电场通过微观结构中的取向极化增强聚合物熔体的抗剪切性。

Electric Field Enhances Shear Resistance of Polymer Melts via Orientational Polarization in Microstructures.

作者信息

Huo Miao, Guo Yunlong

机构信息

University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China.

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

出版信息

Polymers (Basel). 2020 Feb 5;12(2):335. doi: 10.3390/polym12020335.

DOI:10.3390/polym12020335

PMID:32033328

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7077492/

Abstract

In this paper, we studied the alteration of viscoelastic properties of a neat poly(methyl methacrylate) (PMMA), induced by an applied external electric field. The rheological properties of PMMA are measured using a rotational rheometer at elevated temperatures. The electric field effect on the shear resistance of the polymer was studied by examining rheological responses under difference experimental scenarios. We find that the external electric field can remarkably enhance shear resistance and prevent flow of PMMA melt, enabling it to behave more predictably at high temperatures. Dynamic rheological analysis illustrates that the external electric field speeds up the recovery of mechanical properties of the PMMA melt after large deformations, whereas the PMMA melt exhibits thixotropic behaviors. The recovery velocity is influenced by the strength of the electric field, specifically, and is found to be proportional to the electric field strength. Our experimental characterization may provide new evidence on the tuning mechanical properties of polymer melts via controlling segmental polarization.

摘要

在本文中，我们研究了外加电场引起的纯聚甲基丙烯酸甲酯（PMMA）粘弹性性能的变化。在高温下使用旋转流变仪测量PMMA的流变性能。通过考察不同实验场景下的流变响应，研究了电场对聚合物剪切阻力的影响。我们发现，外加电场可以显著提高PMMA熔体的剪切阻力并阻止其流动，使其在高温下表现得更具可预测性。动态流变分析表明，外加电场加速了大变形后PMMA熔体力学性能的恢复，而PMMA熔体表现出触变行为。恢复速度具体受电场强度影响，并且发现与电场强度成正比。我们的实验表征可能为通过控制链段极化来调节聚合物熔体的力学性能提供新的证据。