Thermoset High-Temperature Systems Based on the Homolytic Polymerization of Benzocyclobutene Aromatic Imide Monomers and Oligomers

摘要

A new series of bisbenzocyclobutene-terminated aromatic imide oligomers has synthesized from the condensation reaction of 4-aminobenxocyclobutene and the perspective dianhydride in refluxing acetic acid/toluene. The differential scanning calorimetric studies of the foregoing monomers indicated that polymerization exotherms began at 229-250 C and reached their maxima at 258-263 C. The cured samples (250-254 C; Nitrogen; 8 hrs) were surprisingly stable toward thermooxidative degradation; only 7- to 10- percent weight loss was observed after 200 hrs (in air) at 314 C (600 F).