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利用二乙醇胺和丙烯酸甲酯合成的N,N-二羟乙基-3-胺基丙酸甲酯作为AB2型单体,以纳米SiO_2为核,通过其表面羟基与单体的反应,制得SiO_2接枝超支化聚酯的纳米粒子(SiO_2-HBP);再利用超支化端羟基与α-己内酯进行开环反应,合成了含柔性长链的二氧化硅-长链超支化聚酯杂化物(SiO_2-HBP-L);然后将杂化物与丁苯橡胶共混,制备了SiO_2-HBP-L/SBR纳米复合材料.FTIR、XPS和TGA测试证实改性后纳米SiO_2表面接枝了含长链超支化聚酯.SEM测试结果表明,相对于未改性的纳米SiO_2,SiO_2-HBP-L在乙醇和橡胶基体中分散性较好,且改性后纳米SiO_2与复合材料的相容性明显提高.硫化性能测试表明,SiO_2-HBP-L能大大缩短胶料的正硫化时间,增大总交联密度;同时SiO_2-HBP-L/SBR纳米复合材料的力学性能和耐磨性能有较大的提高,很好地实现了补强.
N, N-dihydroxyethyl-3-aminopropionic acid methyl ester synthesized by diethanolamine and methyl acrylate was used as AB2 monomer and nano-SiO 2 was used as the core. Through the reaction of its surface hydroxyl groups and monomers, SiO 2 -HPP-grafted hyperbranched polyester nanoparticles (SiO 2 -HPP); and then the ring-opening reaction of the hyperbranched hydroxyl groups with α-caprolactone was carried out to synthesize a long-chain hyperbranched polyester with long chains (SiO_2-HBP-L) were synthesized.The nanocomposite SiO_2-HBP-L / SBR was prepared by blending the hybrid with styrene-butadiene rubber.The FTIR, XPS and TGA measurements confirmed that the surface of the nanosilica was grafted Containing hyperbranched polyester.The results of SEM showed that the dispersibility of SiO_2-HBP-L in ethanol and rubber matrix was better than that of unmodified nano-SiO_2, and the compatibility of nano-SiO_2 with the composite The properties of SiO_2-HBP-L / SBR nanocomposites were significantly improved. The vulcanization test showed that SiO_2-HBP-L can shorten the vulcanization time and increase the total crosslinking density. Meanwhile, the mechanical properties and wear resistance of SiO_2-HBP- Greater improvement, well achieved reinforcement.