【摘要】 借助凝胶时间、DSC和TGA等测试研究了PN-PAA和MPN-PAA共混树脂的热固化过程和热分解过程。凝胶时间(140℃)结果表明共混树脂的交联反应速率比PAA明显趋缓;PN-PAA(1∶1)、MPN-PAA(1∶1)共混树脂的固化温度比PAA提高约50℃;K issinger公式和Crane公式计算表明共混树脂比PAA树脂具有更大的热固化反应活化能,但具有基本相同的反应级数;TGA结果表明共混树脂固化物具有很好的热稳定性,其起始热分解温度接近400℃。采用Coats-Redfern方程分析、解释了树脂热分解过程的表观动力学。与PAA树脂比较,共混树脂固化工艺性有较大改善,并具有较好的耐热性,有望用作高温防热复合材料的基体。更多还原

【Abstract】 The thermal curing and degradation of the blends of PN-PAA and MPN-PAA are studied via gelation,DSC and TGA techniques.The results of gelation time show that the blends have slower curing reaction rates than pure PAA.Compared with PAA,the blends show a remarkable increase in cure-temperature(about 50℃).Kinetic parameters for thermal cure are analyzed by Kissinger and Crane equations: the blends exhibit higher activation energy and nearly the same reaction order compared with pure PAA.The results of TGA indicate that the blends possess high thermal stability with initiation decomposition temperatures of about 400℃.By Coats-Redfern method on one dynamic TGA profile,the kinetics for thermal degradation of various resins is provided.Owing to the attractive processability and thermal stability,the blends may be utilized as matrices of high temperature ablative materials.更多还原