What is mainly measured in composite materials through dynamic steam adsorption testing?

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What is mainly measured in composite materials through dynamic steam adsorption testing? When subjected to environmental stresses such as fluctuations in relative humidity, water molecules diffuse into the matrix of the composite. This will have an adverse effect on the bond between the substrate and the reinforcement material. For composites in general, long-term exposure to humid environments can cause irreversible damage due to the hydrolysis of the polymer matrix or the formation of microcracks, and high temperatures can accelerate this process. At the same time, the diffusion of water vapor into the matrix lowers the glass transition temperature and softens the matrix, resulting in a decrease in strength. Therefore, water content and its impact on composite materials are very important for structural designers. Dynamic vapor sorption testing (DVS Intrinsic) can be used to obtain data on water adsorption in the compound at different temperatures, which helps in characterizing such materials and predicting their performance in use.