Contribution à l'Étude du Fluage des Copolymères Polyesters Linéaires Insaturés—Styrolène

The experiments dealt with a series of succino‐fumarates of diethylene glycol whose crosslinking, obtained by copolymerization with styrene, is adjusted by varying the percentage of fumaric and succinic acids. The overall results in tensile creep in the transition zone have provided for each of the compounds a master curve for creep and a time‐temperature relation of the Williams, Landel, and Ferry type. These master curves may be expressed in terms of general equations function of time, of the number of portions of network chains between two crosslinking junctures and of the percentage in styrene.