Abstract: The group transfer block copolymerization of methyl methacrylate(MMA)and C_7～9 methacrylate(C_7～9 MA)has been studied by using a bifunctional initiator and an anionic catalyst. The influences of temperature、 monomer sequence、 concentration ratio of initiator to catalyst and concentration of monomers have been investigated. When T₁=85℃, T₂=25℃, [I]=1.35×10^-2 mol/L, [Cat]/[I]=0.126, C_7～9 MA as first monomer, the block copolymerization of C_7～9 MA and MMA appeared to be predominate. The thermal deformation temperatures of the copolymers obtained are reported. The triblock copolymer(PMMA PC_7～9 MA PMMA)has been characteriaced by FT IR, ¹H NMR, and GPC as a homogeneous phase system.

Key words: group transfer polymerization, block copolymerization, methacrylate