Cooperativity of the β-relaxations in aromatic polymers -: art. no. 021502

被引：0
作者：
Sanz, A
Nogales, A
Ezquerra, TA
Lotti, N
Finelli, L
机构：
[1] CSIC, Inst Estructura Mat, E-28006 Madrid, Spain
[2] Univ Bologna, Dipartimento Chim Applicata & Sci Mat, I-40136 Bologna, Italy
来源：
PHYSICAL REVIEW E | 2004年 / 70卷 / 02期
关键词：
D O I：
暂无
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
The dielectric loss spectra of a series of copolyesters of poly(ethylene terephthalate) and poly(ethylene isophthalate) have been measured as a function of temperature in a broad frequency range (10(-1)-10(9) Hz). By these measurements, the merging of the two relevant relaxations alpha and beta has been studied. The beta processes exhibit a complex temperature dependence, showing a clear Arrhenius dependence at temperatures well below the glass transition temperature, a transition zone where the characteristic relaxation time of this process nearly does not change with temperature, and an Arrhenius behavior with a higher activation energy for temperatures above the glass transition. The analysis of these results indicates that the beta relaxation in these systems presents typical characteristics of a genuine Johari-Goldstein process. This finding has been interpreted as due to the full monomer extension of the molecular motions involved in the beta relaxation in agreement with recent proposals.
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页数：6
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