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首页> 外文期刊>Journal of Applied Polymer Science >Stress cracking and chemical degradation of poly(ethylene terephthalate) in NaOH aqueous solutions
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Stress cracking and chemical degradation of poly(ethylene terephthalate) in NaOH aqueous solutions

机译：NaOH水溶液中聚对苯二甲酸乙二醇酯的应力开裂和化学降解

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摘要

Stress cracking is one of the most frequent causes of premature failure of polymers, affecting also engineering polymers like PET. In this work, the stress cracking behavior of injection moulded PET was investigated using sodium hydroxide (NaOH) aqueous solutions in various concentrations as active fluids. The application of mechanical load to the sample bars was done in a tensile testing machine, using the ordinary tensile test and also a relaxation procedure. The results showed that all NaOH solutions were aggressive stress cracking agents for PET, reducing mechanical properties and causing catastrophic failure with a significant surface damage. The occurrence of hydrolysis reactions was also observed when NaOH solutions were applied in combination with tensile loads, causing a reduction in molar mass of PET molecules.
机译：应力开裂是聚合物过早失效的最常见原因之一，还影响了工程聚合物（如PET）。在这项工作中，使用各种浓度的氢氧化钠（NaOH）水溶液作为活性流体，研究了注塑PET的应力开裂行为。将机械载荷施加到样品棒上是在拉伸试验机中进行的，使用普通的拉伸试验以及松弛程序。结果表明，所有NaOH溶液都是用于PET的侵蚀性应力开裂剂，降低了机械性能，并导致灾难性故障，并对表面造成了严重破坏。当将NaOH溶液与拉伸载荷结合使用时，还观察到水解反应的发生，从而导致PET分子的摩尔质量降低。

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