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以液体聚硫橡胶(LP-3)为增韧剂,对双酚A-苯胺型苯并噁嗪(B-a)树脂进行了改性,通过核磁共振氢谱(1H-NMR)、红外光谱(FTIR)、示差扫描量热仪(DSC)对B-a与LP-3的共混和固化过程进行了研究,通过动态热机械分析仪(DMA)、弯曲和冲击实验、热失重分析仪(TGA)对固化物的机械性能和热性能进行了表征.结果表明,在共混过程中,B-a与LP-3发生了开环加成反应,加成产物的酚羟基对苯并噁嗪的开环聚合具有一定的促进作用,共混物较B-a具有更快的固化速率.当LP-3的加入量为5 wt%时,固化物的韧性就可以得到明显改善,冲击强度相比B-a固化物提高了3.4倍,而且此时的固化物具有高的储能模量(30℃时E’=3.9 GPa)、高的玻璃化转变温度(T_g=206℃)和良好的热稳定性(T_(5%)=322℃,T_(10%)=342℃),表现出最佳的综合性能.
The bisphenol A-aniline benzoxazine (Ba) resin was modified with liquid polysulfide rubber (LP-3) as a toughening agent and characterized by 1H-NMR, FTIR ), DSC and DSC were used to study the blending and curing process of Ba and LP-3. The dynamic mechanical analysis (DMA), flexural and impact experiments, thermal gravimetric analyzer (TGA) The mechanical properties and the thermal properties of the product were characterized.The results showed that Ba and LP-3 had a ring-opening addition reaction during the process of blending, and the phenolic hydroxyl groups of the adduct had a certain degree of ring- And the blend has a faster curing rate than Ba.When the addition amount of LP-3 is 5 wt%, the toughness of the cured product can be significantly improved, the impact strength is increased by 3.4 times compared with the Ba cured product, The cured product at this time had a high storage modulus (E ’= 3.9 GPa at 30 ° C), a high glass transition temperature (T_g = 206 ° C) and good thermal stability (T_ (5%) = 322 ℃, T_ (10%) = 342 ℃), showing the best overall performance.