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Characterization and Antibacterial Properties of Genipin-crosslinked Chitosan/TiO₂ Nanocomposites
Yangshuo Liu,Jiange Lu,Ming Li,Chiyang He 한국고분자학회 2016 폴리머 Vol.40 No.2
Novel nanocomposite films consisting of genipin-crosslinked chitosan (GC), poly(ethylene glycol) (PEG), titanium dioxide (TiO₂), and silver (Ag) nanoparticles were prepared containing various amounts of TiO₂ and Ag nanoparticles. The effects of composition and TiO₂ nanoparticles on the physico-chemical properties of nanocomposite samples were evaluated by X-ray diffraction and infrared analysis. The greatest swellings were observed in the acidic pH. GC/PEG/TiO₂/Ag nanocomposite showed the pH-sensitive swelling behavior and the improved mechanical properties. These nanocomposites were shown to have antibacterial activity towards Escherichia coli. GC/PEG/TiO2/Ag composite films had higher antimicrobial activities than GC/PEG and GC/PEG/TiO₂ nanocomposite films. GC/PEG/TiO₂/Ag composite films have potential application as wound dressings.
Synthesis, Characterization and Application of Grafted Starch Prepared with Microwave-assistance
Yangshuo Liu,Teng Luo,Ming Li,Fucheng Yu 한국고분자학회 2017 폴리머 Vol.41 No.3
Butyl acrylate grafted starch (St-g-BA) was made by the method of microwave-assisted synthesis, involving the combination of microwave irradiation and a chemical free radical initiator (H₂O2-Fe<SUP>2+</SUP>) to initiate the grafting reaction. The optimal conditions for the graft copolymerization with respect to reaction microwave power, exposure time and type of initiator were investigated. Under the optimal conditions, the percent grafting and grafting efficiency were 26.2% and 85.9%, respectively. The grafted starch was characterized by using Fourier transform infrared spectroscopy and scanning electron microscopy. The St-g-BA exhibited good tensile strength, elongation at break and abrasion resistance. Therefore, it is suggested this biomaterial could be used in various industrial applications such as textile sizing and food packaging.
Preparation of O/W Pickering emulsion with oxygen plasma treated carbon nanotubes as surfactants
Wenbao Chen,김형일,Xuyan Liu,Yangshuo Liu,Youngkil Bang 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3
The stable oil-in-water Pickering emulsions were prepared using oxygen plasma treated carbon nanotubes (CNTs) as stabilizers. Some hydrophilic groups such as hydroxyl and carboxyl groups were introduced on the surface of the CNTs by plasma treatment. The plasma treated CNTs showed the improvement in dispersion stability in water as well as cyclohexane for a long time. The Raman spectra showed that the original properties of CNTs were retained after the plasma treatment differently from other chemical modification methods. The plasma treated CNTs had a favorable interfacial interaction with water to form the stable O/W Pickering emulsions. The formation of stable O/W Pickering emulsion was dependent on the CNT concentration, the plasma treatment period, and the sonication time.
Wenbao Chen,Xuyan Liu,Yangshuo Liu,방영길,김형일 한국고분자학회 2011 Macromolecular Research Vol.19 No.1
Silica/polypyrrole hybrid nanoparticles were synthesized by microemulsion polymerization using a vapor monomer feeding system. In contrast to the traditional monomer feeding methods of microemulsion polymerization,this study examined the monomer feeding as a vapor phase. The silica modified with 3-(trimethoxysilyl)propyl methacrylate had a hydrophobic surface was used as template. Polymerization of the pyrrole monomers occurred at the surface of the modified silica. By controlling the vapor feeding speed, the pyrrole monomer could be dispersed in the reaction system quite well. The modification of silica and the formation of silica/polypyrrole nanoparticles were characterized by Fourier transform infrared spectroscopy and thermogravimetric analysis. The silica/polypyrrole hybrid morphology was confirmed by transmission electron microscopy and scanning electron microscopy. Through a comparison with the nanoparticles made by traditional microemulsion polymerization, uniform and smaller nanoparticles of the silica/polypyrrole hybrid nanocomposite were prepared using a lower surfactant content. The size of the silica/polypyrrole nanocomposites decreased with increasing surfactant content and decreasing pyrrole monomer content.