Promoted ablation resistance of polydimethylsiloxane via crosslinking with multi-ethoxy POSS

摘要

The utilization of advanced propellants leads to unbearable temperature and pressure in propellent ramjet engines, paving the way for the enhancement of thermal insulation materials. High temperature vulcanized polydimethylsiloxane composites have been adopted due to the satisfactory ablation resistance at the expense of complicated industrial costs. For the purpose of simplifying the processes and enhancing the ablation resistance of polymer matrices, room temperature vulcanized hydroxyl-terminated polydimethylsiloxane (HPDMS) crosslinked with multi-ethoxy POSS (EOPS) coatings (EOPS@ HPDMS) were prepared through capping crosslink. Comparative analyses of different EOPS loadings of EOPS@HPDMS revealed the chemical bonding of EOPS ameliorated the effects about crosslinking properties, mechanical strengths, thermal performance and ablation resistance of HPDMS. This work could provide an optional method for developing advisable ablation resistance composites in aerospace applications.