The aryl-boron phenolic resins with super ablation properties for resin-transfer molding process of three-dimensional fabric

Abstract

Boron phenolic resin (BPR) is one of the most extensively utilized matrix resins in ablative field due to its outstanding heat resistance and ablation performance. However, the existing BPR applications are severely limited since they are unsuited for the resin-transfer molding (RTM) process. This research created and manufactured arylboronic acid (PBA) modified phenolic resins (ABPRs) for RTM techniques. Since ABPRs maintain a low viscosity (0.8 Pa·s) throughout a wide temperature range (65–80°C), they can meet the essential criteria of co-injection RTM techniques. The inclusion of PBA significantly improved the heat and oxidation resistance of ABPRs. The char yield of PR and ABPR-d are 64.5% and 70.4%, respectively (800°C, N2 atmosphere). Three-dimensional woven carbon fiber textiles strengthen the CF/ABPR composites, which possess excellent mechanical and ablation properties. The oxygen-acetylene test revealed the mass ablation rates of CF/PR and CF/ABPR-d were 0.052 and 0.049 mm/s, respectively. Since the ABPRs for RTM developed for this work have excellent processability, thermal characteristics, mechanical properties and ablation capabilities, the resin matrix can offer excellent comprehensive attributes for the nozzle-expanding section of solid rocket motors.