A series of crosslinked polyurethane acrylate solids with glass transition temperatures ranging from –49 to +65 °C was prepared
by photopolymerization of specially formulated solvent-free resins. The kinetics of thermooxidative and thermal (in N2) degradation of these crosslinked acrylate networks at temperatures ranging from 100 to 400 °C was studied as a function
of crosslink density using thermogravimetry. The polyacrylate network degradation rate decreased with the increase of crosslink
density, while apparent activation energy of degradation increased. Polyacrylate thermal stability increase with crosslinking
was explained by decreased rate of oxygen and volatile products diffusion and/or slowing of depolymerization due to increased
radical recombination rate, and decreased chain segments mobility in systems with higher crosslink density.