通过预聚反应制备了一种新型聚苯并噁嗪改性树脂.利用FTIR、GPC表征了改性树脂.利用旋转黏度计、DSC、DMA和TGA分别考察了树脂的流动性能、固化行为和改性树脂固化物的热性能.结果表明:制备的苯并噁嗪改性树脂在60～ 100℃,黏度小于500 mPa·s,恒温6h黏度不明显增大,具有良好的流动性能,适用于RTM成型工艺.改性树脂聚合温度较低,具有良好的固化工艺性.改性树脂固化物在氮气气氛下Td5在430℃以上,在900℃的残重高达73.71％,Ts为353.4℃,具有良好热性能.%A novel modified polybenzoxazine resin was prepared.The final product was characterized with Fourier transform infrared spectrometry (FT-IR) and gel permeation chromatography (GPC).Processing capability and cure behavior of the modified resin was investigated by rotary viscometer and differential scanning calorimetry (DSC),respectively.The resin shows a low viscosity of 180 mPa·s at 60℃ for above 6 hours,indicating that the resin is suitable for resin transfer molding (RTM) process to fabricate composites.DSC results show the modified resin can be cured at about 200℃ without adding any other curing additives.Dynamic mechanical analysis (DMA) shows the inflection point of tanδ is 353.4℃.Thermogravimetric analysis (TGA) showed 5％ weight loss temperature of the final cured products in nitrogen is 437.9℃,and char yield is 73.71％ at 900℃.
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