Styrene-starch graft copolymers production

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. 

Graft copolymers of A and B monomers are named poly(A-g-B) or poly A-grafi-poly B with the backbone polymer -(-A-)/j— mentioned before the branch polymer. Some examples are poly(ethylene-g-styrene) or polyethylene-grq/i-poly styrene and starch-grayi-poly(methyl methacrylate). In the nomenclature of block copolymers, b or block is used in place of g or graft, e.g., poly(A- -B) or poly A-block-po y B, poly(A-b-B-b-A) or poly A-block-po y B-block-po y A, poly(A-b-B-b-C) or poly A-block-poly B-block-poly C, and so on. Thus the triblock polymer (XX) is called poly(styrene- -butadiene-i -styrene) or polystyrene- /cck-polybutadiene-b/ock-polystyrene. For commercial products, such polymers are usually designated by the monomer initials thus, structure (XX) is named SBS block copolymer. 

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