聚乙烯基吡咯烷酮改性氰酸酯树脂耐湿热性能研究

对聚乙烯基吡咯烷酮(PVP)/氰酸酯树脂体系的耐湿热性能进行系统研究.选取湿热老化环境为100h/100℃沸水老化.结果表明,随着体系中PVP用量的增大,固化改性树脂的吸湿率逐渐增大.湿热老化使固化树脂的力学性能急剧下降,但PVP的加入能够有效改善下降趋势.当PVP用量为5wt%时,湿热老化后固化树脂的弯曲强度和冲击强度的强度保持率从原始氰酸酯的38.8%和35.5%提高到86.8%和66.1%.湿热老化对体系力学性能的损伤可从固化树脂老化前后断口形貌得到合理解释.湿热老化过程中,PVP的加入对体系的热性能、电性能及尺寸稳定性的不利影响较小.综合考虑体系的各项性能指标,以PVP用量为5%时体系耐湿热性能最佳.

Hydrothermal Effects on Cured Cyanate Ester Resin Modified by Poly Vinyl Pyrrolidone

Poly vinyl pyrrolidone(PVP) was employed to improve the toughness of bisphenol A dicyanate ester resin.Hydrothermal performance of the modified systems was systematically studied.Moisture takeup of the cured resins increased with the increasing of the weight percentage of PVP.Mechanical properties of the modified systems were largely improved by the introducing of PVP.The residual flexural and impact strength after ageing were improved from 38.8% and 35.5% to 86.8% and 66.1% respectively when 5wt% of PVP were introduced.On the same time,however,the introducing of PVP had little influence on the thermal performance,dielectric properties and shape stability.The modified system with 5wt% PVP showed the best performance overall.