Graft copolymers of starch and polyacrylonitrile. 1. Effect of source

Graft copolymers of six cereal starches with polyacrylonitrile have been prepared and investigated. The molecular weights, the frequencies of grafting and the absorbencies of the saponified products are almost independent of the source of granular starches. The percent yield and percent add‐on of graft copolymers from gelatinized starches are almost the same as those from granular cereal starches. However, their molecular weights, corresponding frequency of gelatinized starch graft copolymers have increased five times, while absorbency is doubled. The effects of initiator monomer concentration, and of dilution are discussed.