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Chen Y.,South China Normal University | Chen Y.,Innovation Training of Guangdong Higher Education Institutes | Yang L.,South China Normal University | Yang L.,Innovation Training of Guangdong Higher Education Institutes | And 10 more authors.
Journal of Thermal Analysis and Calorimetry | Year: 2013

A series of new modified epoxy resin (EP) cured products were prepared from epoxidized soybean oil and commercial epoxy resin, with methyl nadic anhydride as curing agent and 1-methylimidazole as promoting agent. The thermal properties of the resins were characterized by DMA and TG; DSC was used to determine the curing process. Fourier transform infrared spectroscopy was utilized to investigate their molecular structures and scanning electron microscopy was used to observe the micro morphology of their impact fracture surfaces. Tensile and impact testing was employed to characterize the mechanical properties of the cured products. The combination of commercial EP with 20 wt% ESO resulted in a bioresin with the optimum set of properties: 130.5 C T g, 396.9 C T 50 %, 74.89 MPa tensile strength, and 48.86 kJ m-2 impact resistance. © 2012 Akadémiai Kiadó, Budapest, Hungary.

Chen W.,South China Normal University | Sun F.,South China Normal University | Sun F.,Innovation Training of Guangdong Higher Education Institutes | Zhu Z.,South China Normal University | And 2 more authors.
Microporous and Mesoporous Materials | Year: 2014

Nanoporous SnO2 fine particles with controlled specific surface area were prepared in the SnSO4 and H2SO4 mixed solutions by a simple photochemical method for the first time. Compared with other solution methods, the controlling of surface area can be manipulated at room temperature without the addition of any surfactant or template. Only by controlling the concentration of H2SO4, the specific surface area of the product could be tuned in the range of 13-203 m2 g-1. They showed high activity and can be applied to efficient photocatalytic degradation of dye pollutants under a low power (8 W 254 nm) UV lamp. It was found the activity gradually increased with the increase of the specific surface area or the increase of the concentration of H 2SO4 employed in the preparation process. The formation of SnO2 and pore structures, the morphologies, the compositions and the photocatalytic degradation mechanisms were systematically studied. © 2013 Elsevier Inc. All rights reserved.

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