title: Synthesis of starch-g-lactic acid copolymer with high grafting degree catalyzed by ammonia water.
abstract: The study of starch-g-lactic acid copolymer has gained much attention for its completely degradable property, but its intricate synthetic procedure and low graft degree inhibited its further application. In this work, the synthesis of starch-g-lactic acid copolymer was attempted via the catalysis of ammonia water by one-step process, and the structure of starch-g-lactic acid copolymer was characterized by means of IR, (13)C NMR and HMBC. The synthetic conditions were optimized as follows, the starch was activated for 2h at 80°C at first, starch and lactic acid with weight ratios of 1:4 reacted for 4h at 90°C in vacuum. The starch-g-lactic acid copolymer can be finally obtained with graft degree of starch 58.9%.
authors.affiliation: School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China. Electronic address: huyingmo@163.com.
authors.forename: Yingmo
authors.initials: Y
authors.lastname: Hu
authors.affiliation: School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China.
authors.forename: Mingru
authors.initials: M
authors.lastname: Tang
keywords: Ammonia water; Degradable; Graft copolymer; Lactic acid; Starch