| 摘要 |
<p>An initiator is used for initiating controlled polymerisation reactions, the initiator comprising units of the formulae R(73SiO), (R72SiO3/2), and/or (SiO4/2) and has at least one group D-CR82X, wherein each R7 is independently an optionally substituted hydrocarbon group, D is a divalent straight chain or branched alkylene group containing an oxygen or nitrogen heteratom and/or substitued by a carbonyl group, each R8 is independently an alkyl group or a hydrogen atom and X' is a halogen atom. Preferably each R7 is a methyl group and the initiator comprises two terminal -D-CR82X groups wherein each R8 is a methyl group, X is bromine and D is a group CO-NR9R10 or a group CO- (OR10) wherein R9 is an alkyl group or a hydrogen atom and each R10 is independently a straight chain or branched alkylene group. The initiator is particularly useful for initiating controlled polymerisation of vinyl containing monomers.</p> |
