A multifunctional amine, 1,4-bis（2,4-diaminophenoxy）benzene（14 BDAPOB）, was prepared and used as a novel hardener for novolac epoxy resin（ER）. The structure of 14 BDAPOB was characterized with Fourier transform ...A multifunctional amine, 1,4-bis（2,4-diaminophenoxy）benzene（14 BDAPOB）, was prepared and used as a novel hardener for novolac epoxy resin（ER）. The structure of 14 BDAPOB was characterized with Fourier transform infrared（FT-IR） spectroscopy and differential scanning calorimetry（DSC）. The curing kinetics of the novolac epoxy resin/1,4-bis（2,4-diaminophenoxy）benzene（ER/14 BDAPOB） system was studied by means of non-isothermal DSC experiments at five heating rates and determined by the Kissinger, Ozawa and Crane methods. The results showed that the activation energy Ea of the ER/14 BDAPOB（74.56 kJ/mol） system was higher than that of the epoxy resin/LCA-30（ER/LCA-30, 68.85 kJ/mol）, where LCA-30 is a commercial modified diamine. The reaction order, frequency factor and the reaction rate constant at peak temperature of the two systems were calculated. The initial decomposition temperatures（Tonset） were 398.8 ℃（ER/14 BDAPOB）and 334.3 ℃（ER/LCA-30）. The tensile shear strengths were 21.63 MPa（ER/14 BDAPOB） and 21.28 MPa（ER/LCA-30）. The results showed that the two cured systems exhibited good thermal and mechanical properties.展开更多
A conjugated 8-hydroxyquinoline( 8-HQ)-based fluorescent chemosensor( 1) for Zinc ion( Zn^(2+)) and Cadmium ion( Cd^(2+)) was developed in aqueous solution and used for Zinc ion living cells bioimaging. The probe 1 wa...A conjugated 8-hydroxyquinoline( 8-HQ)-based fluorescent chemosensor( 1) for Zinc ion( Zn^(2+)) and Cadmium ion( Cd^(2+)) was developed in aqueous solution and used for Zinc ion living cells bioimaging. The probe 1 was weakly fluorescent,but displayed a strong fluorescence at 580 nm with a large Stokes shift of150 nm in the presence of Zn^(2+) or Cd^(2+). This probe allows the detections of Zn^(2+) in the range of 0. 8-10 μmol/L and Cd^(2+) in the range of 0. 8-8 μmol/L,with the limit of detections of 0. 2 and 0. 6μmol/L for Zn^(2+) and Cd^(2+),respectively. The present probe was successfully used for fluorescence bioimaging of Zn^(2+) or Cd^(2+) in the living cells.展开更多
文摘A multifunctional amine, 1,4-bis（2,4-diaminophenoxy）benzene（14 BDAPOB）, was prepared and used as a novel hardener for novolac epoxy resin（ER）. The structure of 14 BDAPOB was characterized with Fourier transform infrared（FT-IR） spectroscopy and differential scanning calorimetry（DSC）. The curing kinetics of the novolac epoxy resin/1,4-bis（2,4-diaminophenoxy）benzene（ER/14 BDAPOB） system was studied by means of non-isothermal DSC experiments at five heating rates and determined by the Kissinger, Ozawa and Crane methods. The results showed that the activation energy Ea of the ER/14 BDAPOB（74.56 kJ/mol） system was higher than that of the epoxy resin/LCA-30（ER/LCA-30, 68.85 kJ/mol）, where LCA-30 is a commercial modified diamine. The reaction order, frequency factor and the reaction rate constant at peak temperature of the two systems were calculated. The initial decomposition temperatures（Tonset） were 398.8 ℃（ER/14 BDAPOB）and 334.3 ℃（ER/LCA-30）. The tensile shear strengths were 21.63 MPa（ER/14 BDAPOB） and 21.28 MPa（ER/LCA-30）. The results showed that the two cured systems exhibited good thermal and mechanical properties.
基金Shanghai Municipal Natural Science Foundation,China(No.16ZR1401700)
文摘A conjugated 8-hydroxyquinoline( 8-HQ)-based fluorescent chemosensor( 1) for Zinc ion( Zn^(2+)) and Cadmium ion( Cd^(2+)) was developed in aqueous solution and used for Zinc ion living cells bioimaging. The probe 1 was weakly fluorescent,but displayed a strong fluorescence at 580 nm with a large Stokes shift of150 nm in the presence of Zn^(2+) or Cd^(2+). This probe allows the detections of Zn^(2+) in the range of 0. 8-10 μmol/L and Cd^(2+) in the range of 0. 8-8 μmol/L,with the limit of detections of 0. 2 and 0. 6μmol/L for Zn^(2+) and Cd^(2+),respectively. The present probe was successfully used for fluorescence bioimaging of Zn^(2+) or Cd^(2+) in the living cells.
