Effect of structure on glass transition temperature of amine crosslinked epoxies

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Abstract
About 40 epoxide‐amine network polymers with glass transition temperatures ranging from 0 to 232°C were investigated, about one‐third being reported for the first time. The glass transition temperature Tgl of the corresponding linear copolymers was first calculated by use of an additivity law whose physical validity was carefully checked. Then the contribution of crosslink mers was determined, and various physical and empirical approaches of the effect of crosslinking on Tg were compared. The results gave evidence in favor of the DiMarzio approach. A predictive relationship based on these considerations is proposed.