Novel acetylene‐terminated thermosetting polyisoimides with excellent solubility and performed as efficient heat shields composites

摘要

Abstract The acetylene‐terminated polyisoimide oligomers introducing 2,2′‐bis (trifluoromethyl)benzidine (TFMB) or 3,4′‐oxydiphthalic anhydride (3,4′‐ODA) as the diamine were synthesized, and short quartz fiber reinforced polyisoimide composites were prepared. The structure, processability, and thermal properties of polyisoimide oligomers were characterized. The mechanical properties and ablation protection performances of the composites were tested. The effects of TFMB on the processability and thermal properties of polyisoimides were studied. The application properties of short quartz fiber reinforced polyisoimide composites as thermal protection materials were evaluated by coal gas/oxygen ablation test system. These results showed that the introduction of TFMB into the polyisoimide structure can improve its solubility and heat resistance, as well as the ablation protection performances of the composites. The above results showed its potential application in the field of thermal protection materials. This makes it possible for polyisoimide composites to be used in the field of ablation protection.