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“Healable ablative composites from synergistically crosslinked phenolic resin”:

RGFP published a research paper on Chemical Engineering Journal

     Due to the excellent processability and high char yield, phenolic resin (PR) plays a pivotal role in ablative thermal protection systems for the aerospace industry. However, internal defects in conventional phenolic resin matrix composites could potentially scrap the entire thermal protection system and cause devastating safety hazards to the spacecraft. Dynamic crosslink networks could endow the PR and its composites with good healability. But the development of healable and ablative PR materials still remains a challenge. Recently, researchers from the Joint Innovation Center of Thermal Protection Materials (JICTPM) of Xi’an Jiaotong University reported a series of novel PR-based materials. By introducing the crosslinks of hexamethylenetetramine (HMTA) and phenylboronic acid (PBA), the synergistically crosslinked PR with high stability and excellent processability was obtained. Compared with its conventional counterparts, the dynamic boronic ester linkages in the synergistic crosslinks not only offer good processability but high char yield as well. Thanks to its reversibility, the dynamically crosslinked PR composites could be manufactured at a lower cost and higher efficiency. More importantly, the composites could be repaired, reprocessed, and recycled. The oxy-acetylene ablation data showed that the synergistically crosslinked PR composites possess excellent ablative properties and could be potentially used for thermal protection parts in solid rocket motors.

     The first author of the paper is Dr. Xiaolong Xing.

 

 

 

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