title: Chitosan-graft poly(p-dioxanone) copolymers: preparation, characterization, and properties.
abstract: A new biodegradable copolymer of chitosan and poly(p-dioxanone) (PPDO) was prepared through a protection-graft-deprotection procedure using N-phthaloyl-chitosan as an intermediate. PPDO terminated with the isocyanate group was allowed to react with hydroxyl groups of the N-phthaloyl-protected chitosan, and then the phthaloyl group was cleaved to give the free amino groups. The length of PPDO graft chains can be controlled easily by using the prepolymers of PPDO with different molecular weights. The resulting products were thoroughly characterized with FT-IR, (1)H NMR, TG, DSC, SEM, and WAXD. The copolymers were used as drug carriers for sinomenine (7,8-didehydro-4-hydroxy-3,7-dimethoxy-17-methyl-9alpha,13alpha,14alpha-morphinan-6-one) and these exhibited a significant controlled drug-releasing behavior whether in artificial gastric juice or in neutral phosphate buffer solution.
authors.affiliation: Center for Degradable and Flame-Retardant Polymeric Materials (ERCEPM-MoE), College of Chemistry, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610064, China. xiuliwang1@163.com
authors.forename: Xiu-Li
authors.initials: XL
authors.lastname: Wang
authors.forename: Yan
authors.initials: Y
authors.lastname: Huang
authors.forename: Jiang
authors.initials: J
authors.lastname: Zhu
authors.forename: Yan-Bo
authors.initials: YB
authors.lastname: Pan
authors.forename: Rui
authors.initials: R
authors.lastname: He
authors.forename: Yu-Zhong
authors.initials: YZ
authors.lastname: Wang
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D004146:Dioxanes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008855:Microscopy, Electron, Scanning; D015394:Molecular Structure; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D004146:Dioxanes; D011108:Polymers; C079733:poly-4-dioxan-2-one; D048271:Chitosan