title: Effects of amylose content on property and microstructure of starch-graft-sodium acrylate copolymers.
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 1800 g/g, 1300 g/g and 1100 g/g respectively. The grafted copolymers were characterized by FTIR and solid state (13)C 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.
authors: Department of Applied Chemistry, School of Science, Anhui Agricultural University, Hefei 230036, China; Department of Chemical Processes, School of Chemical Engineering, Hefei University of Technology, Hefei 230009, China.
authors: Zhi
authors: Z
authors: Zhang
authors: Department of Applied Chemistry, School of Science, Anhui Agricultural University, Hefei 230036, China. Electronic address: chenpeirong@ahau.edu.cn.
authors: Peirong
authors: P
authors: Chen
authors: School of Tea & Food Science and Technology, Anhui Agricultural University, Hefei 230036, China. Electronic address: dxf@ahau.edu.cn.
authors: Xianfeng
authors: X
authors: Du
authors: Department of Applied Chemistry, School of Science, Anhui Agricultural University, Hefei 230036, China; Department of Chemical Processes, School of Chemical Engineering, Hefei University of Technology, Hefei 230009, China.
authors: Zhonghua
authors: Z
authors: Xue
authors: Department of Applied Chemistry, School of Science, Anhui Agricultural University, Hefei 230036, China.
authors: Shanshan
authors: S
authors: Chen
authors: Department of Chemical Processes, School of Chemical Engineering, Hefei University of Technology, Hefei 230009, China.
authors: Baojun
authors: B
authors: Yang
keywords: Amylose; Graft; Microstructure; Starch; Superabsorbent copolymer