ゴムラテックスビニルモノマー系の空気中ガンマ線グラフト重合

概要

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Natural rubber latex and styrene-butadiene copolymer latex were mixed with acrylonitrile using some kinds of emulsifier, and exposed to gamma-radiation under an atmosphere of air. The following results were obtained from grafting acrylonitrile to the rubber molecules under the conditions above.Oxygen seems to behave as an inhibitor for the polymerization, but does not eminently affect the polymerization rate after the consumption of dissolved oxygen. The polymerization rate is nearly proportional to the dose rate. This relationship is satisfactorily explained by the results reported previously. The total conversion ratio, i.e., the ratio of the increased weight by polymerization to the weight of the monomer used is not dependent on the dose rate, but proportional to the total dose alone. The total conversion ratio is dependent on the type of the emulsifier, and to some extent also on the type of the trunk polymer used. The ratio of increased weight by polymerization to weight of trunk polymer is proportional to the amount of the monomer used.
日本ゴム協会の論文