Acrylonitrile-starch-styrene graft

The ozonization method has been extended to the most varied polymer/monomer systems, such as polybutadiene-03 with acrylamide, methyl methacrylate or styrene, cellulose-03 with styrene or acrylonitrile (127), starch-03 with styrene (126). In this last case the formation of some homopolystyrene as side-product has been mentionned by the authors. The starch-styrene graft copolymers are claimed to be good emulsifiers for water-oil suspensions. 

Already in 1955 Polymer Corporation (63) had applied for a patent on a process of treating naturally occurring polymeric substances or their derivatives with ozone containing inert gases and subsequently contacting the ozonized substrates with polymerizable monomers. In the presence of redox activators butadiene, acrylonitrile, and styrene were grafted onto cellulose, starch, casein, gelatin, and rubber. 

Graft copolymers of polychloroprene and a cationic starch imparted wet-strength properties to paper when applied as wet-end additives to pulp, and they also exhibited cold-contact adhesive properties without pressure being applied. Poly(styrene-n//-acrylonitrile) has been grafted onto starch. ... 

Styrene has been graft-co-polymerized with acrylonitrile on to gelatinized starch at 50 °C with cerium(iv) initiation. The isolated sidechain grafts are soluble in dimethylformamide and may be characterized by gel permeation chromatography. 

---