Q-DEPENDENCE OF THE RELAXATION-TIMES OF THE ALPHA-RELAXATION AS OBSERVED BY QUASI-ELASTIC NEUTRON-SCATTERING

被引：34

作者：

COLMENERO, J ^{[1
]}

ARBE, A ^{[1
]}

ALEGRIA, A ^{[1
]}

NGAI, KL ^{[1
]}

机构：

[1] USN, RES LAB, WASHINGTON, DC 20375 USA

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1994年 / 172卷

关键词：

D O I：

10.1016/0022-3093(94)90440-5

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In a quasielastic neutron scattering investigation of three polymers, poly(vinyl methyl ether), poly(vinyl chloride) and poly(bisphenol A, 2-hydroxypropylether), it was found that the incoherent quasielastic broadening corresponding to the alpha-relaxation can be well described assuming a Kohlrausch-Williams-Watts intermediate scattering function I(Q,t) proportional to exp[ - (t/tau(WW))(beta)]. The relaxation time, tau(WW)(Q,T), varies with Q (momentum transfer) as Q(-kappa)(kappa > 2; kappa being dependent on the system) in the Q-range investigated. It was also found that this Q-behaviour and the non-Debye behaviour, defined by the beta parameter, are directly correlated. In this paper, it is shown that these features are also found in different glass-forming systems (PIB, PDMS, PPO, OTP,...) when the available quasielastic neutron scattering and relaxation data of the literature are reinterpreted. Finally, a very simple scenario based on the coupling model of Ngai, which accounts for the experimental behaviour found, is described.

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页码：229 / 233

页数：5

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