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Methyl-methine linkages of Novolac, a commercially available t-butylphenol acetylene condensed (TBPA) resin, have been identified by recognition of pyrolysis pathways using pyrolysis-gas chromatography/mass spectrometry (Py-GC/mS) in vulcanized rubber. The diagnostic mass spectrum of t-butylphenol with methyl-methine linkages between phenolic rings was observed at m/z 192, corresponding to 4-t-butyl-2-ethyl-6-methylphenol. Other molecular ions were observed at m/z 178, 164, and 150 in the characteristic pyrolyzates. The ion at m/z 192 in the TBPA resin was observed to be characteristic for methyl-methine linkages between the phenolic groups, and the analytical pyrolysis-GC/mS method was thus able to identify the resin at low levels in vulcanized rubber. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
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P. Kivits J. Reulen J. Hendricx F. Van Empel J. Van Kleef 《Journal of luminescence》1978,16(2):145-160
Results of thermally stimulated luminescence (TSL) and conductivity (TSC) experiments on CdGa2S4 are reported. In the lower temperature region of the TSl curve a decay of luminescence is observed that is probably due to donor-acceptor pair recombination since no accompanying conduction is measured. The TSL and TSC curves of the undoped material further consist essentially of two peaks. If trap depths are calculated with various methods from the literature it turns out that for one peak different values are obtained. These differences cannot be explained with the conventional model consisting of one trapping level and one recombination level. If the results are compared with more complex models it follows that thermal quenching, the presence of a trap distribution, thermally disconnected traps and recombination via excited states, are important. This is most clearly demonstrated in the cases with excess Ga and with Ag or In as dopant. Although this approach probably yields valuable information about CdGa2S4, no definite conclusions may be drawn since some essential questions remain unsolved. 相似文献
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Hernández-Rocamora VM Reulen SW de Waal B Meijer EW Sanz JM Merkx M 《Chemical communications (Cambridge, England)》2011,47(21):5997-5999
A modular self-assembly strategy is presented that allows the non-covalent synthesis of multivalent protein dendrimers using the strong interaction between choline-functionalized dendrimers and the choline binding protein C-LytA. Choline dendrimers displaying fusion proteins of C-LytA and the collagen binding protein CNA35 represent attractive multivalent targeting ligands for collagen imaging. 相似文献
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