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Chen X.,Anhui University | Chen X.,Anhui Province Key Laboratory of Environment friendly Polymer Materials
Asian Journal of Chemistry | Year: 2014

Poly(N-vinyl pyrrolidone) is a nonionic water-soluble amphiphilic polymer. The nitrogen atom of side group in poly(N-vinyl pyrrolidone) macromolecular chain possesses a partial positive charge. Therefore, electrostatic interactions between the nitrogen atom in poly(N-vinyl pyrrolidone) and the anionic surfactant headgroup of sodium dodecyl benzene sulfonate should be taken into account in PVP-SDBS system. As a result the viscosity, conductivity and surface tension measurements show that the interaction between poly(N-vinyl pyrrolidone) and sodium dodecyl benzene sulfonate can be explained by the two-stages interaction model which orignally is suggested for polyelectrolyte-surfactant systems. In the first stage the anionic headgroups of sodium dodecyl benzene sulfonate individually bind to the "cationic" side groups of poly(N-vinyl pyrrolidone) chain due to electrostatic attraction. When the surfactant concentration increases, the second stage of the micellization of polymer-bound surfactant occurs. © 2014, Chemical Publishing Co. All rights reserved. Source

Chen X.,Anhui University | Chen X.,Anhui Province Key Laboratory of Environment friendly Polymer Materials
Analytical Methods | Year: 2015

A novel anionic water-soluble poly(3,4-propylenedioxythiophene) derivative (WSPProDOT) has been prepared through FeCl3 oxidative polymerization with a subsequent post-polymerization defunctionalization process, and applied as a colorimetric sensor to determine and discriminate non-ionic and cationic surfactants in aqueous solutions. The de-aggregation, conformation change of WSPProDOT and its colorimetric and fluorescent responses toward non-ionic and cationic surfactants have been studied by absorption and emission spectroscopy. The solution color of WSPProDOT changes from purple to blue upon addition of a non-ionic surfactant and from purple to black for a cationic surfactant. Therefore, non-ionic and cationic surfactants can be discriminated and detected using this versatile sensing platform. This journal is © The Royal Society of Chemistry 2015. Source

Wu X.,Anhui University | Wu X.,Anhui Province Key Laboratory of Environment friendly Polymer Materials | Chen P.,Anhui University | Chen P.,Anhui Province Key Laboratory of Environment friendly Polymer Materials | And 7 more authors.
Soft Matter | Year: 2013

Using Monte Carlo simulation, we investigated the phase separation of copolymer-nanoparticle composites confined between two neutral surfaces. The incorporated nanoparticles are selective to the copolymer blocks, being repulsive to one block and attractive to the other. We constructed a series of phase diagrams for copolymer nanocomposites phase separated under varied film thicknesses. With the increase of concentration of nanoparticles, a morphological transition from lamellae to perforated lamellae, cylinders, and spheres was observed in the films. The effect of system parameters on the formation and orientation of these structures was studied in detail. We also investigated the evolution of the configuration of the chains and their composed blocks, as a function of concentration and selectivity strength of the nanoparticles. © 2013 The Royal Society of Chemistry. Source

Liu X.,Anhui University | Liu X.,Anhui Province Key Laboratory of Environment friendly Polymer Materials | Zhou Y.,Anhui University | Zhou Y.,Anhui Province Key Laboratory of Environment friendly Polymer Materials | And 6 more authors.
Journal of Materials Science | Year: 2015

Novel environmental friendly hydroxypropyl cellulose (HPC) hydrogels were fabricated upon compositing with graphene oxide (GO) in this work. In order to promote a more homogeneous dispersion of GO sheets in HPC, GO was firstly modified with HPC chains through esterification. The morphology and chemical structure of the functionalized HPC-GO were characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectrometer, X-ray diffraction, and thermo-gravimetric analysis. Then scanning electronic microscope was employed to compare the morphologies of the HPC and HPC-GO/HPC hydrogels. The obtained HPC-GO/HPC hydrogels exhibited excellent adsorption performance toward methylene blue. Simulation of the practical use by preparing simple adsorption columns made from in situ formation of HPC-based hydrogels had given a visible observation of the significant adsorption effect brought by the incorporation of HPC-GO sheets. Adsorption kinetics were then imitated by Lagergren pseudo-first-order and pseudo-second-order models. Adsorption isotherms were imitated by Langmuir isotherm and Freundlich isotherm. © 2015, Springer Science+Business Media New York. Source

Ni S.-B.,Anhui University | Ni S.-B.,Anhui Province Key Laboratory of Environment friendly Polymer Materials | Wang Z.,Anhui University | Wang Z.,Anhui Province Key Laboratory of Environment friendly Polymer Materials | And 6 more authors.
Cailiao Gongcheng/Journal of Materials Engineering | Year: 2012

The acrylate/nano-SiO 2 composite emulsion was prepared through miniemulsion polymerization of nanosilica powder with acrylate monomers. The structure, morphology, thermal and mechanical properties of composite emulsion and films were characterized by FT-IR, TEM, tensile testing machine and thermal analyzer. The influence of the amount of nanosilica on the properties of composite emulsion and films was studied. The results show that the composite emulsion particle shows core-shell structure. Thermal stability and mechanical property of films are greatly improved by adding nanosilica particles. The films have good transparency when nanosilica mass fraction is 5%. Source

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