Polymer Chain Dynamics: Evidence of Nonexponential Mode Relaxation Using Thermally Stimulated Depolarization Current Techniques

被引：23

作者：

Arrese-Igor, S. ^{[1
]}

Alegria, A. ^{[1
,2
]}

Colmenero, J. ^{[1
,2
,3
]}

机构：

[1] CSIC UPV EHU, Ctr Mixto, Ctr Fis Mat MPC, San Sebastian 20018, Spain

[2] Univ Basque Country, Dept Fis Mat, San Sebastian 20080, Spain

[3] Donostia Int Phys Ctr, San Sebastian 20018, Spain

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 07期

关键词：

DIELECTRIC-RELAXATION; MOLECULAR-DYNAMICS; POLYISOPRENE; POLARIZATION;

D O I：

10.1103/PhysRevLett.113.078302

中图分类号：

O4 [物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

The slowest (p = 1) mode relaxation of several polyisoprenes has been experimentally isolated by thermally stimulated depolarization current techniques. Close to the glass transition the p = 1 mode deviates from the exponential behavior assumed by Rouse and tube-reptation theories. This effect is found to be a consequence of the closeness of tau(p-1) and alpha-relaxation time scales. The scenario resembles that of broadened fast component dynamics in polymer blends with high dynamic asymmetry and suggests a possible general interpretation in terms of the effect of local density fluctuations (alpha relaxation) on chain dynamics.

引用

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