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Liu Y.,Beijing University of Chemical Technology | Yan X.,Beijing University of Chemical Technology | Lan J.-L.,Beijing University of Chemical Technology | Teng D.,Beijing University of Chemical Technology | And 3 more authors.
Electrochimica Acta | Year: 2014

Hybrid nanocomposites composed of carbon nanofibers and Ti-doped SnO x nanoparticles with varied molar ratios of Ti/Sn (=0.05, 0.1 and 0.2) have been prepared through electrospinning technique and subsequent thermal treatments. High-resolution transmission electron microscopy showed that the Ti-doped SnOx nanoparticles with a very small particle size of 2∼4 nm were uniformly encapsulated in the carbon nanofibers (CNFs). Among the as-prepared samples, the electrode with the Ti/Sn molar ratio of 0.1 delivered the best reversible capacity of 670.7 mAh g-1 at the 60th cycle, which was 17.9% higher than that of the pristine SnO x/CNFs (SOC). What is more, the optimal electrode presented good rate performance (302.1 mAh g-1 at 2 A g-1). The enhanced lithium storage properties of Ti-doped SnOx/CNFs (TSOC) can be attributed to the uniform encapsulation of ultrafine SnOx nanoparticles in the conductive CNFs as well as the doping with Ti4+. © 2014 Elsevier Ltd.

Wang K.,Changzhou University | Jiang S.,Changzhou University | Liu J.,Changzhou Institute of Advanced Materials | Nie J.,Beijing University of Chemical Technology | Yu Q.,Changzhou University
Progress in Organic Coatings | Year: 2011

Benzophenone-di-1,3-dioxane (BP-DDO), a novel photoinitiator for free radical polymerization, was synthesized and characterized. The photopolymerization kinetics of BP-DDO was studied by real-time infrared spectroscopy (FT-IR). When this photointiator was used to efficiently initiate polymerization of acrylates and methacrylates, there was an optimum cure rate with the increase in BP-DDO concentration. Both the polymerization rate and final conversion increased with the increase in light intensity. The kinetics study of photopolymerization of TMPTA showed that BP-DDO was a more effective photoinitiator than benzophenone and benzophenone/ethyl-4-dimethylaminobenzoate (EDAB). © 2011 Elsevier B.V.

Liu J.-G.,Changzhou University | Xu L.,Changzhou Institute of Advanced Materials | Fang Y.-Q.,Changzhou University
Journal of Sol-Gel Science and Technology | Year: 2014

Novel hybrid organic-inorganic coatings with interpenetrating network were synthesized by the acid-catalyzed hydrolytic co-polycondensation of tetraethoxysilane and 3-metacryloxypropyltrimethoxysilane, followed by radical polymerization with methyl methacrylate and triallyl isocyanurate (TAIC). The hybrid coatings were characterized by Fourier transformed infrared spectroscopy, thermogravimetric analysis and scanning electron microscope, and their anti-corrosion behaviors were evaluated by potentiodynamic polarization, electrochemical impedance spectroscopy and salt spray test. The results indicated that the hybrid coatings exhibited excellent anti-corrosion ability by forming a physical barrier between metal and its external environment. Thermal stability of the hybrid coatings was increased after the addition of TAIC. Furthermore, hydrophobic properties of the hybrid coatings were examined by measuring the contact angles, and the change in wetting characteristics of the hybrid coatings was not obvious. © 2014 Springer Science+Business Media New York.

Peng C.,Changzhou University | Wang K.-M.,Changzhou University | Lu J.,Changzhou University | Qian X.-C.,Changzhou Tronly New Electronic Materials Co. | And 3 more authors.
Yingxiang Kexue yu Guanghuaxue/Imaging Science and Photochemistry | Year: 2012

The photopolymerization kinetics of combination photoinitiator systems which were composed by 2, 2', 5-tris(2-fluorophenyl)-4-(3, 4-dimethoxypheny)-4', 5'-diphenyl-1, 1'-biimdazole (WJ-HABI), photosensitizer N, N-bis(diethylamino) benzophenone (EMK) and hydrogen donors N-pheylglycine (NPG) were investigated by Real-time Infrared (RT-IR) spectroscopy. The different initiator concentrations, the different compositions of photoinitiator systems, light intensity and different functional monomers on the polymerization were studied. The results indicated that with the increase of initiator concentration and light intensity, the double bond conversion and the polymerization rate increased.

Wu W.-T.,Changzhou University | Ma G.-P.,Changzhou Institute of Advanced Materials | Lu J.,Changzhou University | Fang D.-W.,Changzhou University | And 3 more authors.
Yingxiang Kexue yu Guanghuaxue/Imaging Science and Photochemistry | Year: 2013

2, 2', 4-(2-chlorophenyl)-5-(3, 4-dimethoxyphenyl)-4', 5'-diphenyl-1, 1'-two imidazole (CZ-HABI) is a highly efficient UV initiator. Its characteristics were investigated by FTIR and 1HNMR and UV absorption spectra. The compound photointiator systems consisted of photoinitiator 2, 2', 4-(2-chlorophenyl)-5-(3, 4-dimethoxyphenyl)-4', 5'-diphenyl-1, 1'-two imidazole (CZ-HABI), photosensitizer 4, 4'-bis (diethylamino)benzophenone(EMK) and hydrogen donor N-phenyl glycine (NPG). Real time infrared spectroscopy (RT-IR) was used to study the effect of polymerized kinetics of compound photointiator systems. The results indicated that basically no initiation efficient without hydrogen donor, while the effect of initiation efficient boosted greatly in the case of adding hydrogen donor. When concentration of compound photointiator systems increased, the conversion rate of the double bond can been enhanced. Its maximum polymerization rate accorded with the direct proportion relationship of Rp∝(PI)1/2. The conversion rate of the double bond of the monomer and maximum reaction rate were enlarged accompanying with the light intensity strengthened. The final conversion rate of the double bond of diacrylate monomer was higher than that of triacrylate monomer. Initiator efficiency of complex photoinitiator system was better than conventional ITX/EDAB initiator system, and similar to initiator efficiency of 184, 1173.

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