Abstract The influence of molar mass and temperature on the rheological properties of polymethylmethacrylate (PMMA) melts was investigated by dynamical mechanical and creep-recovery experiments. The results shown that the steady state viscosities obtained from both experimental modes were in good agreement, and a well linear relationship between the activation energy and molar mass was obtained. The creep compliance of PMMA increased with the molar mass increased or temperature decreased, while the linear steady state recoverable compliance was found to be independent of the molar mass and temperature. Moreover, it was found that the master curves followed the time-temperature superposition principle well in the whole frequency range or time scale.

中文翻译：

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聚甲基丙烯酸甲酯熔体流变特性的摩尔质量和温度依赖性

摘要 通过动态力学和蠕变恢复实验研究了摩尔质量和温度对聚甲基丙烯酸甲酯（PMMA）熔体流变性能的影响。结果表明，两种实验模式得到的稳态粘度符合良好，活化能与摩尔质量之间具有良好的线性关系。PMMA 的蠕变柔量随着摩尔质量的增加或温度的降低而增加，而线性稳态可恢复柔量被发现与摩尔质量和温度无关。此外，发现主曲线在整个频率范围或时间尺度上都很好地遵循了时间-温度叠加原理。