AbstractThe glass transition temperatures,Tg, and strength properties have been determined for an acrylic‐based prepolymer containing 25 mole‐ carboxyl functionality crosslinked with five different diepoxides. TheTgvalues vary from 100° to 200°C, and ultimate elongations of 2 to 7 at 25°C are observed with the different crosslinking agents. These variations are rationalized in terms of the structural elements present in the diepoxides. Thermosets possessing rigid structural units at the crosslink points connected by flexible segments have the best all‐around combination ofTgand tensile properties. A decline in these properties was noted when the epoxide/carboxyl ratio exceeded unity owing to the formation of mixed networks and free ch
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