title: A novel and simple procedure to synthesize chitosan-graft-polycaprolactone in an ionic liquid.
abstract: An ionic liquid, 1-ethyl-3-methylimidazolium acetate (EMIMAc), was synthesized and employed as a homogeneous and green reaction media to prepare chitosan-graft-polycaprolactone (CS-g-PCL) via ring-opening polymerization, using stannous octoate (Sn(Oct)2) as a catalyst. The structures and compositions of copolymers could be facilely controlled by the reaction conditions and feed ratios. The grafting content of polycaprolactone (PCL) could reach as high as 630%. The chemical structures of the copolymers were systematically characterized by (1)H NMR, Fourier transform infrared spectroscopy (FTIR) and wide-angle X-ray diffraction (WAXD), while thermal properties were studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The thermal stability and glass transition temperature (Tg) of the graft copolymers vary regularly with the change of PCL grafting content.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (ICCAS), Beijing, PR China.
authors.forename: Zhaodong
authors.initials: Z
authors.lastname: Wang
authors.forename: Liuchun
authors.initials: L
authors.lastname: Zheng
authors.forename: Chuncheng
authors.initials: C
authors.lastname: Li
authors.forename: Dong
authors.initials: D
authors.lastname: Zhang
authors.forename: Yaonan
authors.initials: Y
authors.lastname: Xiao
authors.forename: Guohu
authors.initials: G
authors.lastname: Guan
authors.forename: Wenxiang
authors.initials: W
authors.lastname: Zhu
mesh_terms: D002152:Calorimetry, Differential Scanning; D002236:Carbohydrate Conformation; D048271:Chitosan / Q000031:analogs & derivatives* / Q000138:chemical synthesis*; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D011091:Polyesters / Q000138:chemical synthesis*; D012997:Solvents / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D058989:Vitrification; D014961:X-Ray Diffraction
chemical_list: D007093:Imidazoles; D052578:Ionic Liquids; D011091:Polyesters; D012997:Solvents; C016240:polycaprolactone; D048271:Chitosan; C518739:1-ethyl-3-methylimidazolium