An extensive experimental study of pure hydrolysis (without oxygen) in polyamide 6 is presented in this paper. 250 micron thick film samples were immersed in pure deoxygenated water at 5 ageing temperatures for almost 2 years. Hydrolysis leads to chain scission, an increase in crystallinity and more surprisingly in a large rise in water content. A new kinetic model considering this water content increase is proposed. The modelled data are confronted with experimental values. It is mandatory to consider this increase in water content in order to be able to predict chain scission at a high level of degradation. It appears that in the absence of oxygen, hydrolysis in polyamide 6 is a slow process when the pH is neutral (7 pH) and obeys an Arrhenius law with an activation energy of 106 kJ/mol. This new model can be used to predict the leaching of macromolecules from the polymer to external water that is of great interest in the framework of ocean pollution by microplastics.

本文介绍了聚酰胺6中纯水解（无氧）的广泛实验研究。将250微米厚的薄膜样品在5个老化温度下浸入纯脱氧水中将近2年。水解导致断链，结晶度增加，更令人惊讶的是水含量大幅上升。提出了一种考虑水含量增加的新动力学模型。建模数据面临实验值。必须考虑含水量的这种增加，以便能够在高降解水平下预测断链。似乎在没有氧气的情况下，当pH为中性（7 pH）时，聚酰胺6中的水解是一个缓慢的过程，并遵循阿伦尼乌斯定律，活化能为106 kJ / mol。