Glassy dynamics of hydrogen-bonded heteroditopic molecules

被引：9

作者：

Lou, Nan ^{[1
]}

Wang, YangYang ^{[2
]}

Li, Haixia ^{[1
]}

Sokolov, Alexei P. ^{[2
]}

Xiong, Huiming ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Dept Polymer Sci, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China

[2] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37830 USA

来源：

POLYMER | 2012年 / 53卷 / 20期

基金：

中国国家自然科学基金;

关键词：

Supramolecules; Glass; Dynamic decoupling; RELAXATION; POLYMERS;

D O I：

10.1016/j.polymer.2012.07.052

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A self-complementary heteroditopic molecule composed of thymine and diamidopyridine end groups and a flexible aliphatic interconnecting chain has been synthesized. The glassy dynamics of this hydrogen-bonded supramolecule have been investigated by using dielectric and rheological measurements, in combination with infra-red spectroscopy and solid-state C-13 NMR experiments. Decoupling of main dielectric relaxation from viscosity has been found in the vicinity of the glass transition and the temperature dependence of viscosity appears to be stronger than that of dielectric relaxation. The unusual dynamic decoupling phenomenon is ascribed to the chemical/dynamic heterogeneity and formation of hydrogen bonds in the supramolecules. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：4455 / 4460

页数：6

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