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FLUORORUBBER AGED UNDER CONTINUOUS COMPRESSION SET AT ELEVATED TEMPERATURES

机译:高温下连续压缩老化的橡胶

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Fluororubbers are cured copolymers based on fluorolefins. Their high thermal and chemical stability added to their mechanical strength lead them to be used in aggressive environments as hoses, seal elements and pipelines for transport of fluids. Studies are needed to evaluate the material behavior under an operating environment due to degradation susceptibility of general elastomers. But the most of these studies are of long duration making them unworkable. So, short term tests under operating simulated environment are required, and some models can be applied to estimate the material behavior under the work conditions at long term. In this work, specimens of a fluororubber were aged under compression in different temperatures. Arrhenius model was used to study their behavior. An increase of stress relaxation was observed by increasing temperature. Weight change and infrared spectroscopy were also employed to evaluate chemical ageing. It was verified that the association of different ageing agents such as chemical, mechanical and thermal is crucial for correct understanding of the material global behavior. Meanwhile, the complex phenomena in a material under multiple agents make it very difficult to reliably predict lifetime.
机译:氟橡胶是基于氟烯烃的固化共聚物。它们的高热稳定性和化学稳定性以及机械强度使其可以在腐蚀性环境中用作软管,密封元件和用于输送流体的管道。由于一般弹性体的降解敏感性,需要进行研究以评估在操作环境下的材料性能。但是,这些研究大多数都是长期的,使它们行不通。因此,需要在运行模拟环境下进行短期测试,并且可以应用某些模型来长期评估工作条件下的材料性能。在这项工作中,氟橡胶的标本在不同温度下在压缩条件下老化。使用Arrhenius模型研究其行为。通过增加温度观察到应力松弛的增加。体重变化和红外光谱也被用来评估化学老化。事实证明,不同的老化剂(例如化学,机械和热)的结合对于正确理解材料的整体行为至关重要。同时,在多种试剂作用下材料中的复杂现象使得很难可靠地预测寿命。

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