Saponified graft copolymers

Concerning the synthesis of graft copolymers, Jedlinski et al. have prepared poly(MMA-g-(3BL) copolymers via anionic grafting of 3BL from a modified PMMA backbone [85]. PMMA chains were partially saponified by potassium hydroxide and complexed by 18C6 crown ether so as to act as multifunctional mac-... 

Graft copolymers of starch with acrylonitrile and 2-acrylamido-2-methylpropanesulfonic acid, after saponification, were claimed to be good sorbents.3092 A composite of saponified acrylonitrile-starch-copolymer with vinyl formal polymers showed very good salt-rejection characteristics and served as membranes.3093 The same material prepared with poly(vinyl chloride) has been used in gaskets for concrete pipes.3057 Saponified acrylonitrile-starch graft copolymers blended with C12-C16 alcohols provided excellent water-retention characteristics.3094... 

S. Farag and E. Al-Afaleq, Preparation and eharacterization of saponified delignified cellulose polyacrylonitrile-graft copolymer, Carbohydr. Polym., 48 (2002) 1-5. 

Saponified Poiyacryionitriie Starch Graft Poiymer Figure 4A.38 Starch graft copolymers. 

Smith [32] prepared starch - acrylonitrile graft copolymers by a method similar to that described above but saponified the copolymer with aqueous alcohol solutions of base before drying. Insoluble products were obtained which absorbed from 20 to 60 times their dry weight in urine. 

Weaver et al. [34] disclosed absorbent polymers prepared in a multi step process. First, a graft copolymer was formed from acrylonitrile and starch. The starch was gelatinized in hot water, followed by a complexation step with Ce + Then acrylonitrile was added to form the graft copolymer. The graft copolymer was isolated, and then saponified with a certain concentration of aqueous alkali such that a soluble, hydrolyzed graft copolymer was obtained. No alcohol was used in the hydrolysis step. Drying this polymer yielded a water Insoluble polymer that absorbed hundreds of times its dry weight in water. 

Saponified polyacrylate-grafted starches have been designed as drilling-mud additives, hydraulic fluids, and flocculants,2982,3056 PVC gaskets,3057 and components of biodegradable plastics.3058-3060 Such copolymers, either free or as... 

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