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Craze Initiation and Failure in Glassy Poly (ethylene Terephthalate): The Effects of Physical Aging with an Without Exposure to Chemical Environments

机译:玻璃状聚对苯二甲酸乙二醇酯的热潮引发和失效:在不暴露于化学环境下的物理老化效应

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The nonequilibrium nature of the glassy state leads to the time-dependent embrittlement of glassy polymers by a process known as physical aging. Similarly, exposure of glassy polymers to an aggressive chemical environment may also lead to a time-dependent embrittlement process known as environmental stress crackign. In the latter process, the time required for brittle failure to occur as a result of chemical exposure depends on he nature of the polymer, its morphology, and hte chemcial environment. Since both physical aging and environmental stress cracking lead to essentially the same result - brittle failure - the question arises as to whether or not the physical aging process might affect the environmetnal stress cracking process. In this work, we demonstrate the accelerated effects of physical aging on craze initiation in a commercially important engineering thermoplastic, poly(ethylene terephthalate), both with and without exposure to aggressive chemical environments.
机译:玻璃态的非平衡性质通过称为物理老化的过程导致玻璃态聚合物随时间的脆化。类似地,玻璃态聚合物暴露于侵蚀性化学环境下也可能导致时间依赖性的脆化过程,即环境应力裂纹。在后一种方法中,由于化学暴露而导致脆性破坏所需的时间取决于聚合物的性质,其形态和化学环境。由于物理老化和环境应力开裂都导致基本相同的结果-脆性破坏-因此出现了一个问题,即物理老化过程是否会影响环境应力开裂过程。在这项工作中,我们展示了物理老化对商业上重要的工程热塑性聚对苯二甲酸乙二醇酯(无论是否暴露于侵蚀性化学环境)中裂纹萌生的加速影响。

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