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首页> 外文期刊>Journal of Applied Polymer Science >Improved thermodynamic approach for predicting the ESC behavior of polycarbonate in binary liquid mixtures
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Improved thermodynamic approach for predicting the ESC behavior of polycarbonate in binary liquid mixtures

机译：改进的热力学方法来预测二元液体混合物中聚碳酸酯的ESC行为

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摘要

This article examines the environmental stress cracking (ESC) behavior of Lexan polycarbonate in a range of mixed environments. The main aim of the work was to establish whether thermodynamic correlations, which can predict ESC to some extent with single environments, hold when dealing with mixed environments. The binary solvent mixtures used were produced from combinations of water, ethanol, benzyl alcohol, trimethylhexanol, and ethylhexanol. Samples of polycarbonate were subject to three-point bend tests while immersed in environments of various composition. From these, the critical strain (εcrit) required to produce crazing was determined in each case. The use of the Hildebrand solubility parameter (δ) to predict ESC behavior was examined. A simple law of mixtures would suggest that given a mixture of two environments with δ1 and δ2 on either side of δ for the polymer there should exist a composition at which the solubility parameter of the polymer and mixture should be equal, giving severe ESC or even solvation. Plots of εcrit versus δ show that this is not necessarily the case. Finally, an enthalpic parameter, based on the Flory-Huggins theory and utilizing partial solubility parameters, was applied and shown to give a reasonable correlation with the critical strains obtained.
机译：本文研究了Lexan聚碳酸酯在一系列混合环境中的环境应力开裂（ESC）行为。这项工作的主要目的是确定当处理混合环境时，在某种程度上可以预测单一环境下的ESC的热力学相关性是否成立。所用的二元溶剂混合物是由水，乙醇，苄醇，三甲基己醇和乙基己醇的混合物制得的。聚碳酸酯样品浸入各种成分的环境中时要经受三点弯曲测试。由此确定在每种情况下产生裂纹所需的临界应变（εcrit）。使用Hildebrand溶解度参数（δ）预测ESC行为进行了检查。一个简单的混合物定律表明，给定两种环境的混合物，在聚合物的δ两侧分别有δ1和δ2，应该存在一个组成，在该组成下，聚合物和混合物的溶解度参数应相等，从而产生严重的ESC甚至是溶剂化。 εcrit与δ的关系图表明情况并非一定如此。最后，基于Flory-Huggins理论并利用部分溶解度参数的焓参数得到了应用，并显示出与所获得的临界菌株合理的相关性。

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