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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Viscosity measurement of organic glasses below and above glass transition temperature
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Viscosity measurement of organic glasses below and above glass transition temperature

机译：低于和高于玻璃化转变温度的有机玻璃的粘度测量

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The viscosity of organic glasses, polystyrene (PS), poly (methylmethacrylate) (PMMA), and polycarbonate (PC) was measured, and the results were compared with those of inorganic glasses previously studied. The measurement was carried out in the pure shear deformation mode using a sandwich method from room temperature (RT) to the glass transition temperature T-g. Two relaxations of thermal activation type appeared in the lower and higher temperature regions (double relaxation). The temperature dependence of the viscosity was found to be sensitive to the mechanical and thermal treatments the specimen received. The compensation effect, a linear relation between the logarithm of the preexponential factor and the activation energy, was observed for the two viscosity relaxations. The shear viscosity measurement was also carried out above T-g using a rotation disk viscometer. The viscosity was in the hydrodynamic regime above T-g and was in the hopping regime below Ted; a crossover occurred near Ted. The overall characteristics of the viscosity of the organic glasses were quite similar to those of inorganic glasses such as metaphosphate glass. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 19]
机译：测量有机玻璃，聚苯乙烯（PS），聚（甲基丙烯酸甲酯）（PMMA）和聚碳酸酯（PC）的粘度，并将结果与​​先前研究的无机玻璃进行比较。使用从室温（RT）到玻璃化转变温度T-g的夹心法以纯剪切变形模式进行测量。在较低和较高温度区域出现两次热活化类型的弛豫（两次弛豫）。发现粘度的温度依赖性对样品接受的机械和热处理敏感。对于两种粘度松弛，观察到补偿效果，即指数前因数对数与活化能之间的线性关系。还使用转盘粘度计在T-g以上进行剪切粘度测量。粘度处于高于T-g的流体力学状态，而处于低于Ted的跳跃状态。特德附近发生了交叉。有机玻璃粘度的总体特征与无机玻璃如偏磷酸盐玻璃的粘度非常相似。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：19]

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