Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
Review
Glass Transition and Glassy Dynamics of Polymers
Yasuo Saruyama Koji Fukao
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2008 Volume 35 Issue 1 Pages 26-35

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Abstract
Glass transitions are commonly observed in many systems including polymers. The glassy states, which could be obtained by cooling liquid states of polymers at high temperature down to lower temperature, show characteristic common properties such as memory and rejuvenation effects. In this paper, we show our recent experimental results including glass transition dynamics of thin polymer films and aging phenomena in polymer glasses after giving an overview of glass transition and glassy dynamics. For thin films of polystyrene, dielectric measurements revealed that the glass transition temperature decreases with decreasing film thickness and the α-relaxation process becomes faster with decreasing film thickness. For poly(methyl methacrylate), aging phenomena have been investigated using dielectric measurements. The memory and rejuvenation effects could be observed for ac-dielectric susceptibility in the temperature cycling mode and are found to be almost the same to those observed in ac-magnetic susceptibility of spin glasses.
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© 2008 The Japan Society of Calorimetry and Thermal Analysis
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