Abstract The solvent absorption of an epoxy o-cresol novolac resin composite has been measured in different aqueous electrolyte solutions (NaCl, CaCl2 and MgCl2) at different salt concentrations from 0.1 to 0.3 mg/l. Next to the total solvent uptake, which was measured by a gravimetric measurement, the absorption of ions was determined by ion chromatography and by atom absorption spectroscopy. The measured solvent absorption in equilibrium was calculated by combining the ePC-SAFT equation of state with a network term, which takes into account elastic forces in the polymer network counteracting a further solvent absorption. In order to model the solvent absorption kinetics, the equation of state was combined with a Maxwell-Stefan diffusion approach and the viscoelastic Kelvin-Voigt model for chain relaxation. The model parameters were only fitted to the absorption in pure water, what was only possible because the epoxy resin absorbed a neglectable amount of ions. The fully predictively calculated values for the absorption in electrolyte solutions are in qualitative agreement to the measured data.

中文翻译：

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模拟水性电解质溶液中高度交联环氧树脂的液体吸收

摘要 环氧邻甲酚酚醛清漆树脂复合材料在不同电解质水溶液（NaCl、CaCl2 和 MgCl2）中的溶剂吸收量在 0.1 至 0.3 mg/l 的不同盐浓度下进行了测量。除了通过重量测量测量的总溶剂吸收量之外，通过离子色谱法和原子吸收光谱法确定离子的吸收。通过将 ePC-SAFT 状态方程与网络项相结合来计算平衡状态下测得的溶剂吸收，该方程考虑了聚合物网络中抵消进一步溶剂吸收的弹性力。为了模拟溶剂吸收动力学，状态方程与 Maxwell-Stefan 扩散方法和用于链松弛的粘弹性 Kelvin-Voigt 模型相结合。模型参数仅适用于纯水中的吸收，这只是因为环氧树脂吸收了可忽略量的离子。电解质溶液中吸收的完全预测计算值与测量数据定性一致。