The plastic deformation of a highly crosslinked glassy polymer, poly(diethylene glycol bis(ally] carbonate)) (ADC resin) at different temperatures was investigated. It is found that both compressive yield stress sigma(y) and Young’s modulus E decrease as temperature is increased. The relationship between sigma(y) and E has been analysed using Argon’s and Bowden’s theories of plastic deformation in glassy polymers. Molecular parameters derived from each theory have been discussed in terms of the chemical structure of the resin.