Abstract
Block copolymerization of styrene and methyl methacrylate by photochemical initiation was carried out successfully in the water phase with a magnetic field. Poly(ethylene glycol) (PEG) with a naphthyl group at one end and a benzoyl benzyl group at the other end ▪ was used as triplet sensitizer. The block copolymerization is dependent on the magnetic field and the concentration of PEG sensitizer. It was found that a magnetic field of 0.035T is sufficient to influence block copolymerization proceeding in the micelles formed by the hydrophilic PEG chain and hydrophobic sensitizer end groups. The molecular weights of polystyrene- block-poly(methyl methacrylate) are in the range of 105–106 and the molecular weight distribution is about 1.61−1.74.
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