The nano-rhombohedral boron nitride particles (RBN) were dried and pretreated,and then added with cyanate ester resin (CE) matrix and dibutyltin dilaurate (BDTL) as initiator to prepare CE/RBN series casting composite.The mechanical properties,glass transition temperature,thermal decomposition temperature and thermal weight loss performance of the composite showed that the impact strength was 15.02kJ/m2 when the mass fraction of RBN was 4.0%,which was 71.65% higher than that of the pure matrix cured product.The bending strength reached 163.60MPa,which was 93.60% higher than that of pure matrix cured products.When RBN was 4.0% of organic matrix,the Tg was 289.50℃,which was 13.30% higher than that of pure matrix cured product.The thermal decomposition temperature was 458.30℃,which was increased by 10.73%.The mass retention rate was 72.40%,which was 41.41% higher than the pure matrix cured product.Considering all factors,when the mass fraction of RBN was 4.0% of the mass of the organic matrix,the properties of the composites were comprehensively improved.
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