Simulation study of the dynamics of entangled polymers under fast flow

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05619
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Polymer/Textile materials
• Research Institution: Yamagata University
• Principal Investigator: Takimoto Junichi 山形大学, 大学院有機材料システム研究科, 教授 (50261714)
• Co-Investigator(Kenkyū-buntansha): SUKUMARAN S.K. 山形大学, 大学院有機材料システム研究科, 准教授 (70598177)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 高分子ダイナミクス / 高速ずり流動 / 絡み合い / 回転運動 / 応力緩和 / 誘電緩和

Outline of Final Research Achievements

Entangled polymer chains relax by escaping from the entanglements by reptation motion under equilibrium. If flow faster than this relaxation is applied, it is believed that the chains are pulled out from the entanglements by flow and the relaxation is accelerated. This acceleration (known as CCR) is now considered as an essential ingredient of the polymer dynamics. In this study, we have shown by numerical simulation that stress and dielectric relaxations are indeed accelerated by flow. It is also found that polymer chains are rotating under shear flow, with the rotation frequency proportional to the square root of the shear rate.

Free Research Field

レオロジー、高分子物理学