Effect of Monomer Structure on the Cure of PMR Polyimides

Investigation of the influence that monomer structure plays in determina tion of the nature of thermoset PMR polyimides has revealed new information regarding the cross linking reaction profile and resultant resin properties. Replacement of BTDE by ODPE as dianhydride shows reduced resin T g values. Synthesis of a new series of alkylene dianilines, with increasing flexibility within the homologous series, evinces lowered cross-linking onset temperatures and T g transitions. Increasing degrees of meta catenation in extended diamines also result in lowered T g values.