In this work, the cure of various stoichiometric mixtures of a difunctional epoxy and tetrafunctional aromatic amine is studied. Tg is used as a direct measure of conversion. The iso-Tg and vitrification curves of the TTT diagram are calculated from knowledge of the activation energy and Tg as a function of time. A kinetic model of the reaction which has been found to satisfactorily describe the 1:1 stoichiometric ratio of this chemical system is tested, and theoretical calculations of Tg as a function of time are compared to experimental results. The reaction is satisfactorily described by the autocatalytic mechanism until vitrification is reached for both excess epoxy and amine stoichiometries. From the one-to-one relationship between Tg and conversion, the single activation energy of reaction, and the shape of the master and virification curves, it appears that the polyetherification reaction is not significant in the excess epoxy sample until after the amine concentration is nearly depleted.
|Number of pages||7|
|Journal||Polymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Materials Science and Engineering|
|State||Published - 1989|
|Event||Proceedings of the ACS Division of Polymeric Materials: Science and Engineering - Miami Beach, FL, USA|
Duration: Sep 11 1989 → Sep 18 1989