The plasticizing effect of moisture on the glass transition temperature of VSE-34 solvent-free epoxy binder based polymer composite materials (PCMs) with different reinforcement was studied. Natural weathering was performed in three climatic regions of Russia: Moscow, Gelendzhik, Sochi. It was shown that the glass transition temperature is significantly reduced after 1 year of exposure and then is gradually increased after 3 and 5 years of exposure. Samples were studied in «as-received» state as well as after drying and saturation by water till mass stabilization in order to investigate the moisture influence on PCMs’ glass transition temperature. Linear relationship between glass transition temperature and moisture content was observed.

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