Intermolecular force and thermal properties of the sulfonyl epoxy blends cured with DGEBA epoxy

Abstract

The sulfonyl epoxy monomer (SEP) was synthesized and further to blend with the diglycidyl ether of bisphenol A (DGEBA). The glass transition temperature (T g ) of the SEP/DGEBA blended materials increased from 103.7 to 163.8 C. The cross-linking density and polymer chain self-association intra-molecular action affected more than that the polymer-polymer intermolecular action (hydrogen bonding) in the SEP blended with the DGEBA materials. The excess stabilization energy in the overall stabilization was only 0.00145% (14.5 ppm), which indicated that the polymer-polymer intermolecular action was weak. The thermal degradation of the SEP segments could form various sulfate derivatives at lower temperature and analyzed by the TGA/GC/Mass. The sulfate derivatives could generate the thermal stable chars, which provided the ''shielding effect'' and antioxidation property. Additionally, these chars could also improve the protective effect and inhibit the thermal-oxidation decomposition under the air atmosphere.