Abstract
AbstractThe radical‐induced grafting of styrene onto polyisoprene (PIP) in benzene solution at, 60°C was studied in rubber concentration (up to 0.5 monomer mole liter‐1) in which the polymerization of styrene shows ideal kinetics with no retardation by PIP. The proportion of polystyrene incorporated as graft is independent of the initiator (benzoyl peroxide) concentration and was found to be consistent with the kinetic expression derived by Cameron et al. The graft fraction of polystyrene which is higher than in the corresponding styrene‐polybutadiene system reflects the higher reactivity of PIP toward radicals. Azobisisobutyronitrile produces no graft copolymer in this system.
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