ポリエチレンにおける時間–温度換算則の現象の解明

抄録

Polymer materials have a viscoelastic property that is time- and temperature-dependent. The time-temperature superposition principle (TTSP) is usually applied to estimate viscoelasticity. In this study, creep analyses were performed using molecular dynamics (MD) simulations to understand the phenomenon of TTSP. For MD, an amorphous polyethylene model was assumed and generated, and creep analyses were performed at four different temperatures. Arrhenius-type TTSP was then applied to the creep simulation results. To gain insight into the phenomenon of TTSP, the potential energies of the models were analyzed. All potential energy curves at the different elevated temperatures were superimposed, and the shift factors and activation energies of each potential energy were obtained. The bond angle and torsion potential energy were found to have a significant effect on TTSP compared with other factors.