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引用次数: 1
摘要
本文首先简要概述了前人在冷基板上气相沉积制备分子玻璃的研究,然后介绍了我们最近对这种分子玻璃和通过玻璃化转变从这些玻璃中获得的过冷液体(SCLs)的研究。在远低于玻璃化转变温度(T g)的沉积温度(T d s)下制备的一些烷基苯衍生物的玻璃表现出大量的过剩体积,当温度以恒定速率升高时,在低于T g的狭窄温度区域内发生松弛并伴随着体积收缩。这些样品也经历了从低密度不稳定SCL到另一个SCL的弛豫。另一方面,同样的烷基苯衍生物的玻璃,在接近T g的温度下沉积,其摩尔体积小于这些化合物的平衡s,并且在低于T g的狭窄温度区域内发生弛豫并伴随着体积膨胀。这些样品中的一些在SCL状态中经历松弛,显示体积逐渐膨胀。我们讨论了气相沉积分子玻璃和scl在非平衡态和局部分子构象方面的差异。
Behavior of Vapor-Deposited Molecular Glass and Supercooled Liquid Obtained through Glass Transition from the Glass
In this paper, we briefly overview first the preceding studies on molecular glasses prepared by vapor deposition on a cold substrate, and then explain our recent studies on such molecular glasses and the supercooled liquids (SCLs) obtained from these glasses through glass transition. Glasses of some of alkylbenzene derivatives prepared at the deposition temperatures ( T d s) much lower than the glass transition temperature ( T g ) show a large excess volume, and undergo a relaxation accompanied with a volume shrinkage in a narrow temperature region just below T g when the temperature was raised with a constant rate. These samples also undergo a relaxation in the SCL states from a low-density unstable SCL to another SCL. On the other hand, glasses of the same alkylbenzene derivatives prepared by the deposition at T d s close to T g show a molar volume smaller than that expected for the equilibrium SCLs of these compounds, and undergo a relaxation accompanied with a volume expansion in a narrow temperature region just below T g . Some of these samples undergo a relaxation in the SCL states showing a gradual expansion in the volume. We discuss such differences in the behavior of vapor-deposited molecular glasses and SCLs in relation to non-equilibrium and local molecular conformations in the samples.