路易斯酸用量对POE/PS间Friedel-Crafts烷基化反应及共混物力学性能的影响

The effects of Lewis Acid Amount on Friedel-Crafts Alkylation Reaction and Mechanical Properties of POE/PS Blends

用IR,DSC,GPC研究了聚苯乙烯(PS)与聚烯烃弹性体(POE)大分子之间的F riede l-crafts烷基化反应。结果表明:在无水A lC l3催化作用下,PS与POE间可发生质子取代反应生成接枝共聚物POE-g-PS,其接枝百分比随A lC l3用量增加先上升后下降;过量的催化剂会导致聚合物降解;接枝共聚物对POE/PS共混物具有明显的就地增容作用,对于POE/PS/A lC l3=50/50/0.2(质量比)共混物,其拉伸强度与简单共混体系相比,提高了4倍,断裂伸长率提高了10倍。

In this paper, a copolymer of POE-g-PS could be formed during melt blending of polystyrene/polyolefin elastomer （PS/POE） blends via a Friedel-crafts benzene ring alkylation of the PS. The effects of the amount of anhydrous aluminum chloride on the grafting-percent-ratio and the degradation of polymer were examined. The results show： there are competing reaction between grafting and degradation in the blending system. When anhydrous aluminum chloride is low 0.2 g/100 g blends, the grafting play an important rule, but When anhydrous aluminum chloride is high 0. 2 g/100 g blends, The degradation of the blends play an important rule. The excellent mechanical property can be acquired for POE/PS= 50/50 blends by adding 0.2 g anhydrous aluminum chloride, the tensile strength is a 4- fold increase and elongation at break is a 10- fold increase compared with mechanical blends.