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Ou B.,Hunan University of Science and Technology | Ou B.,Central South University | Yang G.,Hunan University of Science and Technology | Xiao Y.,Hunan University of Science and Technology | And 5 more authors.
Journal of Macromolecular Science, Part A: Pure and Applied Chemistry | Year: 2013

The silica nanoparticle was covalently functionalized with toluene-2,4-diisocyanate to prepare the functionalized silica nanoparticle containing isocyanate group. Here, the isocyanate group on the functionalized silica nanoparticle have been further derivatized with water and 2-bromoisobutyryl bromide consecutively resulting in the attachment of atom transfer radical polymerization initiators to the surface of the silica nanoparticle. These silica nanoparticle based macroinitiators were used to initiate polymerization of glycidyl methacrylate at ambient temperature in aqueous media. Thus, structurally well-defined poly(glycidyl methacrylate) was grown from the silica nanoparticle surface to yield individual hybrids composed of a silica core and a well-defined, densely grafted outer poly(glycidyl methacrylate) via atom transfer radical polymerization. FTIR spectroscopy was utilized to follow the covalent functionalization of silica nanoparticle and showed the formation of resulting hybrid particle. © 2013 Copyright Taylor and Francis Group, LLC.


Ou B.,Hunan University of Science and Technology | Ou B.,Central South University | Zhou Z.,Hunan University of Science and Technology | Liu Q.,Hunan University of Science and Technology | And 5 more authors.
Polymer Chemistry | Year: 2012

Graphene was covalently functionalized with phenol groups by a 1,3-dipolar cycloaddition reaction without degrading its electronic properties. Here, these phenols on the functionalized graphene have been further derivatized with 2-bromoisobutyryl bromide resulting in the attachment of atom transfer radical polymerization initiators to the sides of the graphene. These graphene based macroinitiators were used to initiate polymerization of methyl methacrylate at room temperature, which was found to be active and thus resulted in covalent functionalization of graphene with poly(methyl methacrylate). Fourier transform infrared spectroscopy was used to follow the introduction of macroinitiators and poly(methyl methacrylate) chains. The resulting materials were analyzed by differential scanning calorimetry, high resolution transmission and field emission scanning electron microscopy and the solubility properties of the functionalized graphene were found to be significantly improved. All the results showed that graphene can be covalently functionalized with poly(methyl methacrylate) by the proposed approach. This journal is © 2012 The Royal Society of Chemistry.


Li H.,Hunan Province Key Laboratory of Coal Resources Clean utilization and Mine Environment Protection | Li H.,Hunan University of Science and Technology | Li Z.,Hunan Province Key Laboratory of Coal Resources Clean utilization and Mine Environment Protection | Chen Z.,Hunan Province Key Laboratory of Coal Resources Clean utilization and Mine Environment Protection | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

In order to study the bioremediation for manganese contaminated soil, seven fungi and eight bacteria, named F1-7 and B1-8, were isolated from the different rhizosphere soil in Xiangtan manganese. Three fungi (F3-5) and three bacteria (B1, B2, B7) with high resistance to manganese were screened. Especially, F3 was able to grow on Mn2+ concentration ≤ 600 mmol/L, B7 could grow on Mn2+ concentration ≤ 80 mmol/L. When the concentration of Mn2+ less than 300 mmol/L, three fungi were able to grow well. However, the results showed a greater degree of inhibition when the concentration was above that. The certain promoting role was displayed on the growth of three bacteria under the low Mn2+concentrations (20~40 mmol/L). In particular, B2 showed the most significant effect. When Mn2+ concentration gradually increased to 80 mmol/L, the inhibition was significantly displayed. The adsorption rate of F3 on manganese reached a peak value, about 60%, under 300 mmol/L of Mn2+ concentration. The maximum absorption rate of B2 was about 70% under 60 mmol/L of Mn2+ concentration. ©, 2014, Science Press. All right reserved.


Dai C.,Hunan University of Science and Technology | Dai C.,Hunan Province Key Laboratory of Coal Resources Clean utilization and Mine Environment Protection | Ma S.,Hunan Province Key Laboratory of Coal Resources Clean utilization and Mine Environment Protection | Liu X.,Hunan University of Science and Technology
Procedia Engineering | Year: 2015

The micro fluidized bed reaction analyzer (MFBRA) was employed to investigate the emission characteristics and the formation kinetics of methane which was released from different kinds of coal and the blended coal during the coal pyrolysis. The results show that under the same pyrolysis condition, the initial release temperature of methane and the pyrolysis activation energy (E) decreases with increasing volatile content of the coal, while the maximum releasing rate and the total volatilization amount of methane increased, indicating that the higher the volatile content of coal, the easier the pyrolysis reaction. Coal blending can change the quality parameters of the single coal. The water content, volatile content and ash content of the blended coal were equal to the weighted average of corresponding single coal, while the activation energy (E) of blended coal was not equal to the weighted average of corresponding single coal. © 2015 The Authors.


Ou B.,Hunan University of Science and Technology | Ou B.,Central South University | Zhou Z.,Hunan University of Science and Technology | Liu Q.,Hunan University of Science and Technology | And 7 more authors.
Polymer Composites | Year: 2014

Titanium dioxide (TiO2) nanoparticles were pretreated with excessive toluene-2,4-diisocyanate (TDI) to synthesize TDI-functionalized TiO2 (TiO2-NCO), and then polymeric nanocomposites consisting of polyamide 6 (PA6) and functionalized-TiO2 nanoparticles were prepared via a melt compounding method. The interfacial interaction between TiO2 nanoparticles and polymeric matrix has been greatly improved due to the isocyanate (i¿NCO) groups at the surface of the functionalized-TiO2 nanoparticles reacted with amino groups (i¿NH2) or carboxyl (iCOOH) groups of PA6 during the melt compounding and resulted in higher tensile and impact strength than that of pure PA6. The nonisothermal crystallization kinetics of PA6/functionalized TiO 2 nanocomposites was investigated by differential scanning calorimetry (DSC). The nonisothermal crystallization DSC data were analyzed by the modified-Avrami (Jeziorny) methods. The results showed that the functionalized-TiO2 nanoparticles in the PA6 matrix acted as effective nucleation agents. The crystallization rate of the nanocomposites obtained was faster than that of the pure PA6. Thus, the presence of functionalized-TiO2 nanoparticles influenced the mechanism of nucleation and accelerated the growth of PA6 crystallites. POLYM. COMPOS., 35:294-300, 2014. © 2013 Society of Plastics Engineers.

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