芳砜纶浆粕在硅橡胶耐烧蚀绝热材料中的应用

以预处理后的国产芳砜纶浆粕纤维（PSA）浆粕作为主要耐烧蚀和增强填料，制备了硅橡胶绝热材料。研究了PSA浆粕纤维含量对硅橡胶绝热材料的分散效果、抗拉强度、断裂伸长率、线烧蚀率、密度和硬度等性能的影响。实验结果表明，芳砜纶浆粕的预处理可以提高其在绝热层基体中的分散和与基体的界面结合；当处理后PSA浆粕纤维用量不大于15份（苯基硅橡胶100份）时，随浆粕用量的增加，硅橡胶绝热材料断裂强度增大，断裂伸长率减小，复合材料的线烧蚀率随着PSA浆粕用量的增加而降低；添加PSA浆粕的硅橡胶绝热材料具有较好的耐烧蚀性，可应用在固体火箭发动机或者冲压发动机中。

Study of polysulfonamide pulp in silicone rubber insulation composites

Silicone rubber insulation for a solid rocket motor was fabricated by adding pretreated polysulfonamide (PSA) pulp. The effect of varying the content of PSA pulp in the silicone rubber on its dispersion was analyzed, as well as the effect on the tensile strength, elongation at break, ablation rate and hardness of the resulting composite. The results showed that pretreatment of the PSA pulp enhanced both its dispersion in the silicone rubber and the interfacial bonding between the pulp and silicone matrix. When the content of PSA pulp was no more than 15 parts per hundred silicone rubber the tensile strength of the material showed an increase, and the elongation showed a decrease, with increasing content of PSA pulp. The erosion resistance increased with increasing content of PSA pulp. The silicone insulation with PSA pulp as a filler has potential applications in solid rockets or ramjet rockets.