title: Preparation of cellulose-graft-poly(ɛ-caprolactone) nanomicelles by homogeneous ROP in ionic liquid.
abstract: Self-associating cellulose-graft-poly(ɛ-caprolactone) (cellulose-g-PCL) copolymers were successfully synthesized via homogeneous ring-opening polymerization (ROP) of ɛ-CL onto softwood dissolved pulp substrate in ionic liquid 1-N-butyl-3-methylimidazolium chloride ([Bmim]Cl). An organic catalyst N,N-dimethylamino-4-pyridine (DMAP) was compared with the traditional metal-based catalyst (Sn(Oct)(2)) as the catalyst of the reaction, and exhibited higher catalytic activity. By controlling the cellulose:ɛ-CL feed ratio and reaction temperature, the molecular architecture of the copolymers can be altered, as evidenced by FT-IR, (1)H NMR, (13)C NMR, TGA and XRD. The self-assembly behavior of the copolymers in water was investigated and characterized using fluorescence probe, dynamic light scattering (DLS) and SEM. The results showed that the cellulose-g-PCL copolymers could form nanosized micelles (approximately 20-100 nm) in water, and the micelle size and critical micelle concentration (CMC) can be controlled by varying the grafting ratio of PCL. These cellulose-based nanomicelles are expected to be useful in broad application fields.
authors.affiliation: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
authors.forename: Yanzhu
authors.initials: Y
authors.lastname: Guo
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Wang
authors.forename: Zuguang
authors.initials: Z
authors.lastname: Shen
authors.forename: Xuancai
authors.initials: X
authors.lastname: Shu
authors.forename: Runcang
authors.initials: R
authors.lastname: Sun
mesh_terms: D002208:Caproates / Q000138:chemical synthesis / Q000737:chemistry*; D002384:Catalysis; D002482:Cellulose / Q000138:chemical synthesis / Q000737:chemistry*; D004224:Diterpenes / Q000737:chemistry; D004337:Drug Carriers; D052578:Ionic Liquids / Q000737:chemistry; D007783:Lactones / Q000138:chemical synthesis / Q000737:chemistry*; D008823:Micelles; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D058105:Polymerization; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D002208:Caproates; D004224:Diterpenes; D004337:Drug Carriers; D052578:Ionic Liquids; D007783:Lactones; D008823:Micelles; C011309:mezerein; C121056:caprolactone; D002482:Cellulose