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采用硼酸酯偶联剂干法改性沉淀白炭黑,并将此改性沉淀白炭黑(SiO2-EB)填充于丙烯腈-丁二烯-苯乙烯(ABS)共聚物中制备复合材料(SiO2-EB/ABS).运用FE-SEM观察到经过硼酸酯处理的沉淀白炭黑的分散性较改性前的明显改善,即单个颗粒间黏结团聚明显降低.通过FT-IR和TGA手段证实在沉淀白炭黑表面存在部分偶联的硼酸酯分子.通过对复合材料力学性能和热性能的测试表明,改性沉淀白炭黑在ABS塑料中最佳填充范围在7.5%～10.0%,其中填充10.0%时复合材料的拉伸强度和冲击强度比未改性的填充复合物分别提高了18.1%和40.2%.随着改性沉淀白炭黑的填充以及填充量的增加(5.0%、7.5%、10.0%、20.0%),所得复合材料的分解温度由纯ABS的410.3℃逐渐提高到416.6℃(改性沉淀白炭黑填充量达10.0%),材料耐热性能有所增强.对于复合材料拉伸断面的表观形貌,FE-SEM观察结果显示改性沉淀白炭黑在ABS复合材料中分散性能良好,填充量达到20.0%时仍然无明显团聚,且与ABS基材界面相容性良好.
The precipitated silica was dry-modified with boronate coupling agent, and the modified precipitated silica (SiO2-EB) was filled into acrylonitrile-butadiene-styrene (ABS) (SiO2-EB / ABS) .By using FE-SEM, the dispersibility of boric acid ester precipitated silica was obviously improved compared with that before modification, that is, the agglomeration of single particles decreased obviously.The FT- The results showed that some boronic acid ester molecules were coupled on the surface of the precipitated silica.According to the mechanical and thermal properties of the composites, the optimum loading range of the modified precipitated silica in ABS plastic ranged from 7.5% to 10.0 %, The tensile strength and impact strength of the composites increased by 18.1% and 40.2%, respectively, compared with the unmodified filler composites when the content of the filler was 10.0% .With the increase of the filler and the loading of the modified precipitated silica %, 7.5%, 10.0%, 20.0%). The decomposition temperature of the composites increased from 410.3 ℃ of pure ABS to 416.6 ℃ (the content of modified precipitated silica reached 10.0%), and the heat resistance of the composites was enhanced .For the apparent morphology of the tensile profile of the composite material, FE-SEM observation showed that the modified precipitated silica in ABS Good dispersion performance composite materials, filling no significant agglomeration still reached 20.0%, and the ABS substrate and good compatibility interface.