Abstract
AbstractA well‐defined graft copolymer of polystyrene and cellulose acetate has been investigated using the density gradient ultracentrifugation method. The initial sample showed two peaks. These were found to be pure graft copolymer and polystyrene; the latter was easily removed by further extraction of the mixture with benzene. The composition of the graft copolymer was determined from the buoyant densities of the graft and the two homopolymers and found to be 49% polystyrene, 51% cellulose acetate compared with 44.1 and 55.9%, respectively, estimated from the weight loss after acid hydrolysis.
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