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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 >Comparison of glass formation kinetics and segmental relaxation in polymers
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Comparison of glass formation kinetics and segmental relaxation in polymers

机译：聚合物中玻璃形成动力学和片段松弛的比较

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Comparisons were made of the fragility (T-g-normalized temperature dependence of segmental relaxation times) derived from mechanical and dielectric measurements to the same quantity determined from the activation energy for enthalpy relaxation as measured by differential scanning calorimetry (DSC). For linear polystyrenes of varying molecular weight, as well as for several other polymers, there was near quantitative agreement between the two measures of fragility. However, for poly(vinylethylene) (PVE) networks, whose normalized temperature dependence by either method increased with increasing crosslink density, the relationship was not quantitative. In contrast to the assessment of fragility, the shape (breadth) of the relaxation function cannot be reliably obtained from DSC measurements. The analysis yields results which depend on thermal history, contradicting the method's assumption of thermorheological simplicity. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 66]
机译：比较了由机械和介电测量得出的脆度（分段弛豫时间的T-g归一化温度依赖性）与差示扫描量热法（DSC）测得的焓弛豫活化能所确定的相同数量。对于不同分子量的线性聚苯乙烯以及其他几种聚合物，两种脆弱性度量之间几乎存在定量一致性。但是，对于聚（乙烯乙烯）（PVE）网络，无论哪种方法，其标准化温度依赖性都随着交联密度的增加而增加，但这种关系不是定量的。与脆弱性的评估相反，不能从DSC测量中可靠地获得松弛函数的形状（宽度）。分析得出的结果取决于热历史，这与该方法对热流变简单性的假设相矛盾。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：66]

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