玻璃形成聚合物和非聚合物中的协同松弛过程

Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP '93) Pub Date : 1993-10-17 DOI:10.1109/CEIDP.1993.378964

S. Matsuoka, G. Johnson, X. Quan

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引用次数: 2

摘要

玻璃化转变附近的构象弛豫是一种局部分子间的协同现象。随着温度的降低，协同作用域的大小向无限大的方向增长，但永远不会达到无限大。根据均分原理，由域大小的分布推导出松弛函数。它比KWW方程更适合数据，特别是在高频时。这种分布表明，即使在玻璃化转变温度附近，大量的构象也会继续经历类似液体的(皮秒)弛豫

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Cooperative relaxation processes in glass forming polymers and non-polymers

The conformational relaxation near the glass transition is a local intermolecular cooperativity phenomenon. As the temperature is lowered, the domains of cooperativity grow in size toward the infinite size but never reach it. The relaxation function is derived from the distribution of domain size according to the equipartition principle. It fits data better than the KWW equation, particularly at high frequencies. This distribution implies that a significant number of conformers continue to undergo liquid-like (picosecond) relaxation even near the glass transition temperature.<>

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Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP '93)

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