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      저자 : Baoqing Fan (검색결과 3 건)
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      • KCI등재

        Synthesis and thermal properties of urethane-containing epoxy resin

        Fan-Long Jin,Heng-Chang Liu,Baoqing Yang,박수진 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-

        A urethane-containing epoxy resin was successfully synthesized by reacting bisphenol A with 1,6- hexamethylene diisocyanate and epichlorohydrin. The chemical structure of urethane-containing epoxy resin was confirmed using FT-IR, 1HNMR, and elemental analysis. DSC results indicated that the initial curing and maximum exothermic peak temperatures of urethane-containing epoxy resin cured with 4,40-diaminodiphenylmethane were 60 8C and 135 8C, respectively; these values were lower than those of a bisphenol A-based epoxy resin. The thermal stability of epoxy resins was studied using TGA, and it was found that the degradation temperature of urethane-containing epoxy resin was lower than that of bisphenol A-based epoxy resin under the same conditions.

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        Fracture toughness and surface morphology of polysulfone-modified epoxy resin

        Hu Jin,Baoqing Yang,Fan-Long Jin,박수진 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-

        The thermal stability, fracture toughness, flexural strength, and surface morphology of a polysulfone (PSF)-modified epoxy resin were investigated using several techniques. The thermal stability of the PSF-modified epoxy resin was similar to that of the neat epoxy resin. The flexural strength of the epoxy resin decreased with the addition of the PSF. The fracture toughness of the PSF-modified epoxy resin significantly improved compared to that of the neat epoxy resin. The SEM micrograph of the modified epoxy resin showed a relatively rough surface with shear deformation and tortuous cracks, thereby inducing higher fracture toughness in the PSF-modified epoxy system

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        Fractionation and Characterization of ε-Poly-L-lysine from Streptomyces albulus CGMCC 1986

        Shiru Jia,Yujie Dai,Baoqing Fan,Guoliang Wang,Yuanyuan Jia,Peng Peng 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.2

        ε-Poly-L-lysine (ε-PLL) produced by Streptomyces albulus CGMCC 1986 was fractionated using ultra-filtration technique with 2 and 5 kDa cut-offs of membrane. The number-average molecular weight of each fraction was determined by 1H nuclear magnetic resonance (NMR)method. The number-average molecular weights of the cutoffs of 5 and 2 kDa and the filtrate are 4,230.95, 3,687.80,and 1,900.82 Da, respectively. 1H NMR indicates the chemical shifts of α-H, β-H, γ-H, δ-H, and ε-H are very similar to all the fractions. Fourier transform-infrared (FTIR)spectra showed that the ε-PLL solid samples obtained by freeze-drying at pH 5 with molecular weights higher than 2 kDa take on a β-turn conformation, however, the fraction with molecular weight smaller than 2 kDa adopts random coil structure. The antibacterial test proved that the fraction between 2 and 5 kDa of membranes behaves the highest antibacterial activity than other fractions for the test strains of Staphylococcus aureus, Micrococcus luteus,Bacillus subtilis, Escherichia coli, and Shigella.

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