This paper describes water absorption in polydicyclopentadiene (PDCPD) and more specially the impact of thermal oxidation on its behavior. Unaged PDCPD is found to be almost hydrophobic consistently with its non-polar structure. During thermal oxidation, hydrophilicity progressively increases with ageing time. This increase is linked with the buildup of polar products (mainly ketones, carboxylic acids, hydroperoxides, alcohols). Moreover, it appears that water absorption in PDCPD obeys to Flory Huggins law for all conditions considered here. In the meantime, water diffusivity seems to decrease when oxidation level increases. Finally, a mastercurve that links carbonyl concentration, water diffusivity and water-polymer interaction parameter is proposed and allow changes of water resistance of PDCPD to be predicted.

本文介绍了聚二环戊二烯（PDCPD）中的吸水率，尤其是热氧化对其行为的影响。发现未老化的PDCPD与其非极性结构一致地几乎是疏水的。在热氧化过程中，亲水性随老化时间而逐渐增加。这种增加与极性产物（主要是酮，羧酸，氢过氧化物，醇）的积累有关。此外，看来PDCPD中的吸水率在此处考虑的所有条件下均符合Flory Huggins法。同时，当氧化水平增加时，水扩散率似乎降低。最后，提出了将羰基浓度，水扩散率和水-聚合物相互作用参数联系起来的主曲线，并预测了PDCPD的耐水性变化。