THE EFFECT OF CONFORMATIONAL RESTRICTIONS ON THE SEGMENTAL RELAXATION DYNAMICS OF SEMICRYSTALLINE POLYMERS

被引：0
|
作者：
Flores, Araceli [1 ]
Pieruccini, Marco [2 ]
机构：
[1] CSIC, Inst Estruct Mat, E-28006 Madrid, Spain
[2] CNR, Ist Proc Chim Fis, Sez Messina, I-98158 Messina, Italy
来源：
ATTI ACCADEMIA PELORITANA DEI PERICOLANTI-CLASSE DI SCIENZE FISICHE MATEMATICHE E NATURALI | 2010年 / 88卷 / 01期
关键词：
D O I：
10.1478/C1A1001001
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
A statistical mechanical model is used to describe the effect of restrictions, due to confinement by crystals, on the segmental relaxation dyamics of semicrystalline polymers. It is shown that the emergence of a rearrangement free energy barrier is intrinsically associated with the dynamic heterogeneity observable in relaxation experiments such as those from dielectric spectroscopy. The relaxation behaviour of a number of systems has been considered; the analysis shows that chain orientation has a significant effect on the degree of cooperativity. Moreover, the relaxation features appear to be influenced by the thermodynamic state of the embedding crystalline domains.
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页数：9
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