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首页> 外文期刊>Journal of Physics. Condensed Matter >Evaluation of viscoelastic master curves of filled elastomers and applications to fracture mechanics
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Evaluation of viscoelastic master curves of filled elastomers and applications to fracture mechanics

机译：填充弹性体的粘弹性主曲线评估及其在断裂力学中的应用

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摘要

The viscoelastic response of filler-reinforced elastomers has been investigated by dielectric-and dynamic-mechanical spectroscopy. Horizontal and vertical shifting factors are evaluated, which are used for the construction of viscoelastic master curves. They are discussed in the framework of filler network effects and the slowed-down dynamics of a polymer layer close to the filler surface. The observed shifting behaviour is shown to be related to the superposition of two relaxation processes, i.e. that of the polymer matrix and the filler network, leading to a failure of the time-temperature superposition principle. While the matrix transforms according to the Vogel-Fulcher equation, the filler network exhibits an Arrhenius dependence, which results from the thermal activation of filler-filler bonds, i.e. glassy-like polymer bridges between adjacent filler particles. Based on the viscoelastic master curves relaxation time spectra are evaluated. By referring to a recently developed theory of crack propagation in viscoelastic solids it is demonstrated that the behaviour of the scaling exponent of the relaxation time spectra correlates fairly well with that of the crack propagation rates measured under moderate severity conditions.
机译：填料增强的弹性体的粘弹性响应已通过介电和动态机械光谱学进行了研究。评估水平和垂直移动因子，将其用于构建粘弹性主曲线。在填料网络效应和靠近填料表面的聚合物层减慢动力学的框架中讨论了它们。观察到的位移行为与两个松弛过程的叠加有关，即聚合物基体和填料网络的叠加，导致时间-温度叠加原理的失败。当基体根据Vogel-Fulcher方程变换时，填料网络表现出Arrhenius依赖性，这是由于填料-填料键的热活化（即相邻填料颗粒之间的玻璃状聚合物桥）引起的。基于粘弹性主曲线，评估了弛豫时间谱。通过参考最近发展的粘弹性固体中裂纹扩展理论，可以证明松弛时间谱的标度指数行为与在中等强度条件下测得的裂纹扩展速率具有很好的相关性。

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