Two styrene‐rubber polymers were prepared by mass polymerization and fractionated to isolate the insoluble graft portions of each. These graft fractions were analyzed by two methods (titration and infrared) for unsaturation. Cleavage at the hydroxylated double bonds was carried out and the polystyrene chains were isolated. A diagrammatic structure for the insoluble graft material has been calculated from the length and number of the polystyrene chains isolated by the cleavage technique. The physical and mechanical properties of the gel fractions are reported.
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