title: Preparation of liquid-core nanocapsules from poly[(ethylene oxide)-co-glycidol] with multiple hydrophobic linoleates at an oil-water interface and its encapsulation of pyrene.
abstract: A convenient approach is provided to prepare liquid-core nanocapsules by cross-linking an amphiphilic copolymer at an oil-water interface. The hydrophilic copolymer poly[(ethylene oxide)-co-glycidol] was prepared by anionic polymerization of ethylene oxide and ethoxyethyl glycidyl ether first, then the hydroxyl groups on the backbone were recovered after hydrolysis and partly modified by hydrophobic conjugated linoleic acid. The copolymer with multiple linoleate pendants was absorbed at an oil-water interface and then cross-linked to form stable nanocapsules. The mean diameter of the nanocapsule was below 350 nm, and the size distribution was relatively narrow (<0.2) at low concentrations of oil in acetone (<10 mg/mL). The particle size could be tuned easily by variation of the emulsification conditions. The nanocapsule was stable in water for at least 5 months, and the shell maintained its integrity after removal of the oily core by solvent. Pyrene was encapsulated in these nanocapsules, and a loading efficiency as high as 94% was measured by UV spectroscopy.
authors.affiliation: Key Laboratory of Molecular Engineering of Polymers, State Education Ministry of China, Department of Macromolecular Science, Fudan University, Shanghai 200433, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Ren
authors.forename: Guowei
authors.initials: G
authors.lastname: Wang
authors.forename: Junlian
authors.initials: J
authors.lastname: Huang
mesh_terms: D000096:Acetone / Q000737:chemistry; D003432:Cross-Linking Reagents / Q000737:chemistry / Q000494:pharmacology; D004852:Epoxy Compounds / Q000737:chemistry*; D006868:Hydrolysis; D019787:Linoleic Acid / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D009821:Oils / Q000737:chemistry*; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry*; D020005:Propanols / Q000737:chemistry*; D011721:Pyrenes / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry*
chemical_list: D003432:Cross-Linking Reagents; D004852:Epoxy Compounds; D009821:Oils; D020005:Propanols; D011721:Pyrenes; D012997:Solvents; D014867:Water; D000096:Acetone; D011092:Polyethylene Glycols; D019787:Linoleic Acid; C004312:glycidol