采用扭矩分析、凝胶含量和力学性能测定、共混物热分析、界面形态观察等方法考察了无水AlCl3用量对聚苯乙烯（PS）和乙丙三元橡胶（EPDM）大分子间Friedel-Crafts烷基化反应的影响。结果表明,加入适量的无水AlCl3可以引发PS、EPDM间的Friedel-Crafts烷基化反应,生成的EPDM-g-PS接枝物可以就地增容PS/EPDM共混物,合金的力学性能得到显著提高;此外,无水AlCl3还可以引发EPDM间产生阳离子聚合反应,生成凝胶;加大AlCl3用量后,由于其引起的PS、EPDM分子链的断链,合金的性能降低;热重分析显示,增容后,PS的最大分解速率温度得到提高。
Using torque analysis,determination of gel content and mechanical properties,thermal analysis,the interface morphology observation and other methods,effects of the amount of anhydrous aluminum chloride（AlCl3） on Friedel-Crafts alkylation reaction between poly（ethylene-propylene-diene monomer）（EPDM） and polystyrene（PS） were investigated.The results show that,by adding an appropriate amount of anhydrous AlCl3,a copolymer of EPDM-g-PS can be formed during melt blending of PS/EPDM blends via a Friedel-Crafts benzene ring alkylation.The EPDM-g-PS copolymer served as a compatibilizer and enhanced the mechanical properties of the EPDM/PS blends.In addition,anhydrous AlCl3 can also initiate the cross-linking of EPDM by cation polymerization.However,when the amount of AlCl3 is increased,the properties of blends become worse due to the chain scission of PS and EPDM.The thermogravimetric analysis shows the temperature of maximum decomposition rate of PS in the compatibilized PS/EPDM blends is raised.
参考文献
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