【摘要】 采用新型双路易斯酸,三甲基氯硅烷和三氯化铟为催化剂引发傅氏烷基化反应,实现了乙烯辛烯共聚物(POE)和聚苯乙烯(PS)共混物的原位增容。红外光谱的结果验证了接枝物的存在。用扫描电子显微镜观察了反应共混物和简单物理共混物的形态,前者分散相的尺寸小于1μm,后者分散相的尺寸一般为3～4μm。原位生成的接枝物(PS-g-POE)起到相容剂的作用,增容后材料的力学性能得到较明显的提升。如:当m(POE)∶m(PS)=40∶60时,与相同组成的物理共混物POE/PS相比,其悬臂梁冲击强度由1.9kJ/m2增加至9.7kJ/m2,断裂伸长率由3.4%提高至46.3%。增容后的共混物低频区的复数粘度升高,表明POE、PS间相互作用增加。更多还原

【Abstract】 A new type of combined catalyst of Lewis acids,Me3SiCl and InCl3·4H2O,that can catalyze Friedel-Crafts alkylation reaction between POE and PS in the molten state was studied. The existence of grafted copolymer was testified by FTIR. SEM micrographs show that the size of the domains was decreased from 3～ 4 μm to less than 1 μm when the combined catalyst was added. Because the in-situ generated PS-g-POE copolymer could act as a compatibilizer in the blending system,the mechanical properties of the reacted blends were improved notably compared to that of the physical blends. For example,after compatibilization,the Izod impact strength of the m(POE)∶m(PS) blend (40∶60) was increased from 1.9 kJ/m2 to 9.7 kJ/m2 and its elongation at break increased from 3.4% to 46.3%. The complex viscosity of the reacted blends within the low frequency range showed a higher value than that of the physical blends,indicating the increased interactions between POE and PS.更多还原