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Influence of network structure on the degradation of poly(ether)amine-cured epoxy resins by inorganic acid
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2018-10-11 , DOI: 10.1016/j.polymdegradstab.2018.10.011
Jonathon D. Tanks , Masatoshi Kubouchi , Yoshihiko Arao

In this paper, we investigate the case of bisphenol-type epoxy crosslinked with poly(ether)amine, immersed in sulfuric acid at elevated temperature. The results show that very high equilibrium mass-change (up to 40%) is observed, and that amine protonation is largely responsible for this behavior. When the acid solution concentration is 5mass% or higher, alcohol dehydration and aromatic ether cleavage reactions occur by excess acid (after amine protonation). A mechanistic degradation model is proposed, which requires no empirical parameters and accounts for polymer network structure differences. The model is supported by calculating the theoretical crosslink density using gravimetric data of penetrated acid at equilibrium.



中文翻译:

网络结构对无机酸降解聚醚胺固化环氧树脂的影响

在本文中,我们研究了双酚型环氧与聚(醚)胺交联的情况,在高温下将其浸入硫酸中。结果表明,观察到非常高的平衡质量变化(高达40%),并且胺质子化是造成这种现象的主要原因。当酸溶液浓度为5质量%以上时,通过过量的酸(胺质子化后)发生醇的脱水和芳香族醚的裂解反应。提出了一种机械降解模型,该模型不需要经验参数,并且可以解释聚合物网络结构的差异。通过使用平衡时渗透酸的重量数据计算理论交联密度来支持该模型。

更新日期:2018-10-11
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