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提供了一种制备氰酸酯预聚物/聚砜共混树脂的工艺,该工艺过程平稳、温和、易控制。通过红外光谱IR研究,随着反应时间的延长,-OCN的红外特征吸收峰变弱,triazine特征吸收峰明显增强。随着PSF/BADCy比值提高,共混树脂的常温剪切强度相应增加;低含量的PSF对树脂高温(230℃)强度影响不大,高含量时,高温剪切强度降低明显。通过DMA分析,共混物只体现出BADCy相关的Tg值,BADCy预聚物和PSF树脂事实上形成一种互穿网络结构(IPN)。共混树脂的真实Tg值为230℃左右。E′-T关系表明,只有高含量的PSF才对BADCy有明显的增韧作用。Tanδ~T关系表明,Tanδ=0.02,总体上共混树脂的韧性不高。通过TG分析,共混树脂的初始分解温度达到400℃,是一种优异的耐高温材料,共混树脂的失重过程完全遵从BADCy自身的热氧化分解规律。
A process for preparing a cyanate ester prepolymer / polysulfone blend resin is provided. The process is smooth, mild and easy to control. IR spectroscopy by IR, with the extension of the reaction time, -OCN infrared characteristic absorption peak weakened, triazine characteristic absorption peak was significantly enhanced. With the increase of PSF / BADCy ratio, the shear strength at room temperature of the blends increased correspondingly. The low content of PSF had little effect on the strength of the resin at 230 ℃, while the shear strength of the blends decreased significantly at high content. By DMA analysis, the blend showed only BADCy-related Tg values, and BADCy prepolymer and PSF resin in fact formed an interpenetrating network structure (IPN). The true Tg of the blend resin is about 230 ° C. The E’-T relationship shows that only high levels of PSF have significant toughening effects on BADCy. Tan δ ~ T relationship shows that Tan δ = 0.02, the overall toughness of the resin blend is not high. TG analysis shows that the initial decomposition temperature of the blend resin reaches 400 ℃, which is an excellent high temperature resistant material. The weight loss process of the blend resin fully complies with BADCy’s own thermal oxidation and decomposition rules.