Epoxy terminated polysiloxane blended with diglycidyl ether of bisphenol-A. 1: Curing behavior and compatibility

摘要

An epoxypropoxypropyl terminated polydimethylsiloxane (DMS-E09) is blended with a commercial epoxy resin [diglycidyl ether of bisphenol-A (DGEBA)], using methyl tetrahydrophthalic anhydride as a curing agent in the presence of the accelerator N, N-dimethyl benzyl amine. The co-curing behaviors, glass-transition temperature (T-g) are studied by differential scanning calorimetry (DSC) and curing kinetic parameters are calculated by Kissinger and Ozawa methods. It is found that the apparent activation energy for DMS-E09 is slightly lower than that of the DGEBA by 9-10 kJ mol(-1). Dynamic mechanical analysis is subsequently employed and reveals that the value of T-g (peak of tan delta at higher temperature) consists with the result of DSC very well. With the increase of DMS-E09 content, storage modulus and the values of T-g and T-beta (peak of tan delta at lower temperature) all have a tendency of decreasing monotonically. Furthermore, T-g and T-beta follow Fox and Gordon-Taylor expression well, indicating compatible networks in certain level are obtained. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46891.