| 摘要 |
A method for producing, in the presence of both monomers, a block copolymer of a polymer block of a vinyl aromatic hydrocarbon (and/or a conjugated diene) and a block of polydimethysiloxane which comprises adding a vinyl aromatic hydrocarbon, an organo alkali metal promoter, hexamethylcyclotrisiloxane and a polar promoter to a solvent (or to the styrene if no solvent is to be used) at a temperature of 0 degrees to 60 degrees C., allowing the polymerization of the vinyl aromatic hydrocarbon to proceed until the color of the vinyl aromatic hydrocarbon - Li+ species which is initially produced fades, then raising the temperature to 60 degrees to 120 degrees C. wherein the hexamethylcyclotrisiloxane polymerizes at the end of the polystyrene polymer blocks and then terminating the polymerization. |
