SIZE-DEPENDENT DEPRESSION OF THE GLASS-TRANSITION TEMPERATURE IN POLYMER-FILMS
SIZE-DEPENDENT DEPRESSION OF THE GLASS-TRANSITION TEMPERATURE IN POLYMER-FILMS
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DOI：
10.1209/0295-5075/27/1/011
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发表时间：
1994-07-01
期刊：
影响因子：
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通讯作者：
CORY, RA
中科院分区：
文献类型：
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作者：
KEDDIE, JL;JONES, RAL;CORY, RA
测定了聚苯乙烯薄膜的玻璃化转变温度随薄膜厚度的变化规律。结果表明，随着薄膜厚度的减小，玻璃化转变温度降低。该效应不具有强烈的分子量依赖性，排除了链约束作为主要原因的可能性；相反，我们认为在玻璃膜的表面存在一个液体状层，其大小随着玻璃化转变温度从下面接近而分散。
The glass transition temperature of thin polystyrene films has been measured as a function of film thickness. It is found that the glass transition decreases in temperature as the thickness of the film is reduced. The effect is not strongly molecular-weight dependent, ruling out chain confinement as the major cause; instead we suggest that at the surface of the glassy film a liquidlike layer exists whose size diverges as the glass transition temperature is approached from below.