In this work,a novel bisbenzimidazolylpyridine-functionalized fluorescent epoxy resin was synthesized for organophosphate pesticide detection.The epoxy resin was characterized by Fourier-transform infrared spectroscop...In this work,a novel bisbenzimidazolylpyridine-functionalized fluorescent epoxy resin was synthesized for organophosphate pesticide detection.The epoxy resin was characterized by Fourier-transform infrared spectroscopy（FT-IR）,proton nuclear magnetic resonance spectroscopy（~1H NMR）,gel permeation chromatography（CPC）,differential scanning calorimetry（DSC） and fluorescence spectroscopy.After loading with Eu（Ⅲ） ions,the epoxy resin showed a strong fluorescence emission.The fluorescence emission was observed to be instantaneously quenched when exposed to trace amount of diethyl chlorophosphate in solution.The Stern-Volmer quenching constants Ksv for quenching at617 nm was determined to be 0.377 × 10^3 L/mol.This sensitive emission-quenching function and easy processing nature of the polymeric support enable the resin to be a promising chemosensor candidate for the detection of organophosphates.展开更多
The mechanical properties of poly(arylene sulfide sulfone)(PASS) electrospun membrane were significantly enhanced by coelectrospinning with semi-aromatic nylon poly(m-xylene adipamide)(MXD6), another engineering plast...The mechanical properties of poly(arylene sulfide sulfone)(PASS) electrospun membrane were significantly enhanced by coelectrospinning with semi-aromatic nylon poly(m-xylene adipamide)(MXD6), another engineering plastic with high thermal stability and good mechanical properties. The tensile strength of PASS membrane increased with increased incorporation of MXD6, and was tripled when 20%MXD6 was incorporated. The mechanism of the mechanical property improvement is the existence of hydrogen bonding interaction between PASS and MXD6 and between adjacent fibers at the intersections. Thermal properties of the PASS/MXD6 membranes were evaluated by differential scanning calorimetry(DSC) and thermogravimetric analysis(TGA), which showed that the membranes could be stably utilized up to180 °C without any change in appearance and without decomposition. Contact angle measurements of all the membranes showed hydrophobic character. To demonstrate the potential applications of PASS/MXD6 blend membranes, their oil absorption capacities were evaluated with three oils of different viscosities, which proved that the PASS/MXD6 membranes are better absorbents than commercial non-woven polypropylene fibers. Therefore, PASS/MXD6 fibrous membranes produced by electrospinning have a great potential in practical applications.展开更多
基金Financial supports from the Research Foundation of the General Armament Department(No.2008 CD 012) are gratefully acknowledged
文摘In this work,a novel bisbenzimidazolylpyridine-functionalized fluorescent epoxy resin was synthesized for organophosphate pesticide detection.The epoxy resin was characterized by Fourier-transform infrared spectroscopy（FT-IR）,proton nuclear magnetic resonance spectroscopy（~1H NMR）,gel permeation chromatography（CPC）,differential scanning calorimetry（DSC） and fluorescence spectroscopy.After loading with Eu（Ⅲ） ions,the epoxy resin showed a strong fluorescence emission.The fluorescence emission was observed to be instantaneously quenched when exposed to trace amount of diethyl chlorophosphate in solution.The Stern-Volmer quenching constants Ksv for quenching at617 nm was determined to be 0.377 × 10^3 L/mol.This sensitive emission-quenching function and easy processing nature of the polymeric support enable the resin to be a promising chemosensor candidate for the detection of organophosphates.
文摘The mechanical properties of poly(arylene sulfide sulfone)(PASS) electrospun membrane were significantly enhanced by coelectrospinning with semi-aromatic nylon poly(m-xylene adipamide)(MXD6), another engineering plastic with high thermal stability and good mechanical properties. The tensile strength of PASS membrane increased with increased incorporation of MXD6, and was tripled when 20%MXD6 was incorporated. The mechanism of the mechanical property improvement is the existence of hydrogen bonding interaction between PASS and MXD6 and between adjacent fibers at the intersections. Thermal properties of the PASS/MXD6 membranes were evaluated by differential scanning calorimetry(DSC) and thermogravimetric analysis(TGA), which showed that the membranes could be stably utilized up to180 °C without any change in appearance and without decomposition. Contact angle measurements of all the membranes showed hydrophobic character. To demonstrate the potential applications of PASS/MXD6 blend membranes, their oil absorption capacities were evaluated with three oils of different viscosities, which proved that the PASS/MXD6 membranes are better absorbents than commercial non-woven polypropylene fibers. Therefore, PASS/MXD6 fibrous membranes produced by electrospinning have a great potential in practical applications.
