丁腈弹性纳米粒子改性酚醛树脂的研究

酚醛树脂具有优异的耐热性、电绝缘性，尺寸稳定性、成型加工性和阻燃性等，广泛地应用在涂料、胶粘剂和复合材料工业上，酚醛树脂由于含有大量苯环以及固化后形成高度交联结构，韧性很差，因此增韧是其高性能化的主要方向之一，橡胶是最广泛使用的增韧剂，几十年来发展了天然橡胶、丁腈橡胶、丁苯橡胶、液体羧基丁腈橡胶、丁吡橡胶等，壬基酚、腰果壳油、桐油、亚麻油、热塑性塑料等也是酚醛树脂有效的增韧剂。

STUDY ON MODIFICATION OF PHENOLIC RESIN BY ELASTOMERIC NANOPARTICLES OF NITRILE BUTADIENE

A nitrile butadiene elastomeric nanoparticle (NBENP) was used for modification of resol phenolic resin.The reaction between NBENP and resol was measured by FT-IR,and the curing behavior of resins was charactered by DSC.The mecanical and thermal properties of modified resins were measured.Fra cture surface of modified phenolic resin was observed by SEM.The results showed that,the impact strength, flexural strength and heat resistance of NBENP modifie d phenolic resin were increased at the same time. A strong interface adhesion wa s formed because of the reaction between hydroxymethyl of resol and NBENP.This s pecial interface conduces to transmission of stress when materials were loaded,a nd inhibition of deformation and decomposition of phenolic matrix when heated.Th e microcrack,initiated with rubber particle,and cavitation of rubbers might be t he main reason for increase in toughness.The honeycomb structure in fracture sur face might be another possible reason for excellent mechanical properties.