Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7792944 | Carbohydrate Polymers | 2014 | 7 Pages |
Abstract
Starch-graft-sodium acrylate (St-g-SA) copolymers were synthesized with ammonium persulfate as an initiator. This work focused on the effects of amylose content of corn starch on the water absorbent capacity and microstructure of the St-g-SA copolymers. The water absorbent capacity of waxy, maize and high amylose St-g-SA copolymers was 1800Â g/g, 1300Â g/g and 1100Â g/g respectively. The grafted copolymers were characterized by FTIR and solid state 13C NMR confirming that the graft reaction had taken place between sodium acrylate and corn starch. The surfaces and cross sections of St-g-SA copolymers were observed by SEM. Incomplete gelatinized starch aggregates increased with increasing amylose content on surfaces and cross sections of copolymers, which accorded with the water absorbent capacity and grafting ratio. DMTA results showed that the waxy St-g-SA copolymer had the highest transition temperature which indicated waxy starch had high grafting ratio.
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Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Zhi Zhang, Peirong Chen, Xianfeng Du, Zhonghua Xue, Shanshan Chen, Baojun Yang,