6533b827fe1ef96bd1285a98

RESEARCH PRODUCT

Copolymerization of n-Butyl Acrylate with Methyl Methacrylate and PMMA Macromonomers:  Comparison of Reactivity Ratios in Conventional and Atom Transfer Radical Copolymerization

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The reactivity ratios of n-butyl acrylate (nBuA) with methyl methacrylate (MMA) and ω-methacryloyl-PMMA macromonomers (MM) in conventional and atom transfer radical copolymerization (ATRP) have been determined. For the copolymerization of nBuA with MMA, good agreement of the ratios is observed between conventional and controlled radical copolymerization, indicating that chemoselectivities in both processes are similar. The relative reactivity of the MM (1/rnBuA) in conventional copolymerization is significantly lower than that of MMA. It depends on the concentration of the comonomers but is not significantly influenced by the length of the MM. At high concentrations the relative reactivity decreases due to diffusion control of the MM addition. In ATRP the relative reactivity of the MM is much nearer to the value of MMA. This is explained by the different time scales of monomer addition in both processes:  whereas the frequency for monomer addition is in the range of milliseconds for conventional polymeriz...