Viscoelasticity and birefringence of bisphenol A polycarbonate
Viscoelasticity and birefringence of bisphenol A polycarbonate
复制标题
双酚A聚碳酸酯的粘弹性和双折射率
DOI：
10.1016/0032-3861(93)90325-5
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
K. Osaki
中科院分区：
文献类型：
--
作者：
E. Hwang;Tadashi Inoue;K. Osaki
测量了双酚A聚碳酸酯在玻璃-橡胶高原区域的动态杨氏模数、E*和双折射。测量的频率范围为1~130赫兹，温度范围为148~170℃。改进的应力-光学规则用于玻璃化和玻璃化过渡区的特性分析。E*可分解为两个分量函数E*RANDE*R。与各分量相关的应力-光学系数Cr和Cg分别为5.0×10−9和3.5×10−11Pa−1。用约化变量法建立E*RANDE*G的主曲线时，发现了不同的温度依赖关系。这一结果可以解释几位研究人员所报道的时间-温度叠加原理的崩溃。
The dynamic Young's modulus,E*, and birefringence of bisphenol A polycarbonate were measured over the glassy to rubbery plateau zone. Measurements were performed over the frequency range of 1 to 130 Hz at various temperatures between 148 and 170°C. A modified stress-optical rule was applied in characteristic analysis of the glassy and glass transition regions. It was earlier proposed to replace the stress-optical rule which, generally, was valid only at relatively low frequencies corresponding to rubbery plateau and rubbery flow regions.E*could be separated into two component functions,E*RandE*R. The stress-optical coefficients,CRandCG, associated with the respective components were 5.0 × 10−9and 3.5 × 10−11Pa−1. In constructing master curves ofE*RandE*Gwith the method of reduced variables, an unlike temperature dependence was found. This result could account for the breakdown of the time-temperature superposition principle forE*reported by several investigators.