Effect of acetone as the third component of initiating system on synthesis of butyl rubber by solution method

The butyl rubber was synthesized with acetone as the third component of initiating system by solution method,and the effect of acetone on the polymerization was investigated.The results showed that the acetone had a certain inhibition effect on the carboncation active center and reduced the side reactions in the later stage of polymerization,thus increasing the relative molecular mass of the polymer.The optimal molar ratio of ethylaluminium sesquichloride to water to acetone was 14.1/1/0.90,and under this condition,the polymer with higher relative molecular mass and narrow molecular weight distribution could be synthesized at a higher tempe-rature.