摘要
以二苯甲烷二胺型苯并噁嗪和含醛基苯并噁嗪的混合物(MA)为基体树脂,通过加入具有高Tg的酚醛型氰酸酯(NCE)对其进行改性,对MA-NCE的凝胶化时间、固化行为及固化物热机械性能进行了研究;同时,引入二苯甲烷二异氰酸酯(MDI)作为阻聚剂,以期降低MA-NCE共混体系低温反应活性,并改善其加工性。实验结果表明,随着共混体系中NCE含量的增加,MA-NCE体系Tg提高而模量降低;MDI的加入则有效降低了共混体系反应活性,延长了凝胶化时间,使共混体系工艺性得到较大程度的改善。其中,MA-NCE-MDI 2-1-4%共混体系具有高的Tg和模量,以及良好的工艺性,可用于热熔法制备预浸料及高性能复合材料。
MA-NCE resin blends based on aldehyde-containing benzoxazine / methylene dianilinebis-benzoxazine resin（ MA） and cyanate ester（ NCE） were prepared. The gelation time and curing behavior of the blends and thermal mechanical property of the cured products were characterized. Then diisocyanate（ MDI） was added into the blend as a polymerization retarder and the influence of MDI was discussed. The results show that,with the increase of cyanate ester content in the blends,Tg increased and modulus decreased; the addition of diisocyanate can effectively prolong the gelation time and improve the processing performance of the blend. Finally,a new high Tg resin used for hot melt prepreg is developed.
出处
《玻璃钢／复合材料》
CAS
CSCD
北大核心
2016年第3期18-22,共5页
Fiber Reinforced Plastics/Composites
基金
国家自然科学基金项目(51273119)
