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采用马来酸酐(MAH)和苯乙烯(St)作为接枝单体,通过溶液聚合法合成接枝极性基团的苯乙烯-丁二烯-苯乙烯三嵌段共聚物(SBS),然后与聚苯乙烯(PS)基体、碳酸钙(CaCO_3)粒子复合,用傅立叶红外光谱仪表征接枝处理前后SBS表面化学结构的变化;并研究了SBS改性对复合材料微观结构和力学性能的影响。结果表明:双单体溶液聚合法成功地将极性基因接枝在SBS链上;填充SBS-g-MAH后,促进CaCO_3在PS基体中的分散、改善PS-CaCO_3粒子间界面粘接,起到良好的增容作用;SBS-g-MAH和CaCO_3粒子对PS基体具有协同增强增韧作用,同时能提高复合材料的拉伸强度和冲击强度。
The maleic anhydride (MAH) and styrene (St) were used as grafting monomers to synthesize the styrene-butadiene-styrene triblock copolymer (SBS) with polar groups by solution polymerization. (PS) matrix and calcium carbonate (CaCO_3) particles. The chemical structure of SBS surface was characterized by Fourier transform infrared spectroscopy before and after grafting treatment. The effects of SBS modification on the microstructure and mechanical properties of the composites were also studied. The results showed that polar monomers were successfully grafted onto the SBS chains by double-monomer solution polymerization. After the addition of SBS-g-MAH, the dispersion of CaCO_3 in PS matrix was promoted and the interfacial adhesion between PS-CaCO_3 particles improved To good compatibilization effect. SBS-g-MAH and CaCO 3 particles can synergistically enhance the toughening effect on the PS matrix and at the same time improve the tensile strength and impact strength of the composites.