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Graft polymerization of some vinyl monomers onto acrylic rubber. I. Chain transfer and grafting reaction

1971; Wiley; Volume: 15; Issue: 7 Linguagem: Inglês

10.1002/app.1971.070150723

1097-4628

Fumio Ide, Isao Sasaki, Seiji Deguchi,

Polymer Nanocomposites and Properties

Abstract The grafting reactions of styrene (St), methyl methacrylate (MMA), and vinyl acetate (VAc) were investigated in the presence of n ‐butyl acrylate–acrylonitrile copolymer. Results showed that the nature of monomer and initiator were the major factors influencing the grafting activity. The grafting efficiency was 0.87 for St, 0.26 for MMA, and 0.18 for VAc under the most favorable conditions. Acrylic rubber reduced the rate of polymerization, and the retarding effect increased in the order St, MMA, VAc. The chain transfer constants for acrylic rubber were evaluated to be 4.8 × 10 −4 for St, 1.27 × 10 −3 for MMA, and 1.45 × 10 −3 for VAc. The rate of polymerization and the grafting efficiency decreased with increasing acrylonitrile content in acrylic rubber, while the chain transfer constant of St for acrylic rubber remained practically unchanged.