Glassy dynamics of hydrogen-bonded heteroditopic molecules

Nan Lou; Yangyang Wang; Haixia Li; Alexei P. Sokolov; Huiming Xiong

doi:10.1016/j.polymer.2012.07.052

Glassy dynamics of hydrogen-bonded heteroditopic molecules

Nan Lou, Yangyang Wang, Haixia Li, Alexei P. Sokolov, Huiming Xiong

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

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 ¹³C 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.

Original language	English
Pages (from-to)	4455-4460
Number of pages	6
Journal	Polymer
Volume	53
Issue number	20
DOIs	https://doi.org/10.1016/j.polymer.2012.07.052
State	Published - Sep 12 2012

Funding

XHM thanks the support by the National Natural Science Foundation of China (No. 21074070 ), the National Basic Research Program ( 2011CB606005 ), Shanghai Pujiang Program ( 10PJ1405400 ) and Research Fund for the Doctoral Program of Higher Education ( 20100073110027 ). APS acknowledges support by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering . Dr. M. M. Guo's help with 13 C NMR experiment is appreciated.

Keywords

Dynamic decoupling
Glass
Supramolecules

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10.1016/j.polymer.2012.07.052

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title = "Glassy dynamics of hydrogen-bonded heteroditopic molecules",

abstract = "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 13C 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.",

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AU - Lou, Nan

AU - Wang, Yangyang

AU - Li, Haixia

AU - Sokolov, Alexei P.

AU - Xiong, Huiming

PY - 2012/9/12

Y1 - 2012/9/12

N2 - 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 13C 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.

AB - 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 13C 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.

KW - Dynamic decoupling

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Glassy dynamics of hydrogen-bonded heteroditopic molecules

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Keywords

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