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以马来酸酐和正十八醇为原料合成了可聚合表面活性剂马来酸单十八酯,并用其改性Fe3O4纳米磁粉。用改性纳米磁粉制备了苯乙烯基可聚合磁流体,并通过本体聚合获得了磁性纳米复合材料。透射电镜分析结果表明,直径约7nm的Fe3O4纳米颗粒在磁流体和复合材料中分散均匀,无明显团聚现象;红外光谱分析结果表明,磁粉表面包覆的马来酸单十八酯和苯乙烯基质发生了共聚。差示扫描量热、热重及凝胶渗透色谱分析结果表明,与相同条件聚合的聚苯乙烯(PS)相比,复合材料的玻璃化转变温度和去除磁粉后的相对分子质量明显降低,但热稳定性比相同条件下聚合的PS有明显提高,这说明可聚合表面活性剂和活性PS链之间形成了共价键,从而增强了Fe3O4纳米颗粒与基质的相互作用。
The maleic anhydride and n-octadecanol were used as raw materials to synthesize the monostearyl maleate, and the modified Fe3O4 nanomaterials were prepared. Styrene-based polymerizable magnetic fluids were prepared by modified nano-magnetic powders and magnetic nano-composites were obtained by bulk polymerization. The results of TEM showed that Fe3O4nanoparticles with a diameter of about 7nm were uniformly dispersed in the magnetic fluid and the composite without obvious agglomeration. The results of FTIR showed that the surface of the Fe3O4nanomaterials Copolymerization occurred. The results of differential scanning calorimetry, thermogravimetry and gel permeation chromatography show that the glass transition temperature of the composites and the relative molecular mass after magnetic powder removal are significantly lower than those of polystyrene (PS) under the same conditions. However, The thermostability is significantly higher than that of the PS polymerized under the same conditions, which indicates that the covalent bond between the polymerizable surfactant and the active PS chain enhances the interaction between the Fe3O4 nanoparticles and the matrix.