Bisphenol A-cyanate resin toughened by polymethyl methacrylate@polybutadiene core-shell structured nanoparticles
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摘要: 采用聚甲基丙烯酸甲酯（PMMA）@聚丁二烯（PB）核壳结构粒子增韧双酚A型氰酸酯（BADCy）树脂，制备了PMMA@PB/BADCy树脂。研究结果表明，当PMMA@PB质量分数为6wt%时，可以取得较好的增韧效果，PMMA@PB/BADCy树脂冲击强度达到了14.32 kJ · m-2，提高了83.6%；DMA和TG-DTA耐热性测试结果表明，PMMA@PB的加入未降低树脂耐热性，固化后PMMA@PB/BADCy树脂的玻璃化转变温度为236.8℃，最大热分解温度为410.0℃。SEM和TEM结果表明，PMMA@PB核壳橡胶在BADCy树脂基体中分散性好，PMMA@PB/BADCy树脂破坏断面呈现典型的韧性破坏。PMMA@PB/BADCy树脂流变特性的测试表明，PMMA@PB核壳橡胶加入后基本没有影响到BADCy树脂的流变特性，PMMA@PB/BADCy树脂的最低点黏度为0.79 Pa · s左右，是树脂浸渍纤维的理想黏度。介电性能测试表明，PMMA@PB核壳橡胶增韧BADCy树脂后介电性能影响不大，当PMMA@PB质量分数为6wt%时介电常数为3.0，介电损耗为0.010。该PMMA@PB/BADCy树脂性能优异，可作为预浸料基体树脂，适用于航空航天低介电复合材料的制造。Abstract: The polymethyl methacrylate(PMMA)@polybutadiene(PB) core-shell structured nanoparticles toughened bisphenol A-cyanate(BADCy) resin was prepared. The mechanical property results show that the PMMA@PB/BADCy resin presents excellent toughness when 6wt% of PMMA@PB core-shell rubber is used. And the impact strength of the PMMA@PB/BADCy resin with 6wt% of PMMA@PB core-shell rubber is 14.32 kJ·m-2, increased by 83.6%. The thermal performances of toughened resin were investigated by DMA and TG-DTA as well. The results show that when 6wt% of PMMA@PB core-shell rubber is used, the glass transition temperature of the cured PMMA@PB/BADCy resin is 236.8℃ and the temperature of maximum degradation rate is 410.0℃. TEM images show that the PMMA@PB core-shell rubber has good dispersion in BADCy resin. SEM images show that the fracture surface of PMMA@PB core-shell rubber toughened BADCy resin exhibits typical toughness fracture. The rheological properties of the PMMA@PB/BADCy resin show that the PMMA@PB core-shell rubber has insignificant influence on the rheological properties of BADCy resin. The lowest viscosity of the PMMA@PB/BADCy resin is 0.79 Pa·s, which is the ideal viscosity to impregnate fiber for preparing prepreg. The dielectric properties at different frequencies show that the PMMA@PB core-shell rubber has little effect on the dielectric properties of toughened BADCy. When 6wt% PMMA@PB core-shell rubber is used, the dielectric constant is 3.0 and the dielectric loss is about 0.010. The PMMA@PB/BADCy resin system presents excellent performances and can be used as matrix of prepreg. It is suitable for the manufacture of low dielectric composites in aerospace.
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