The 2,2,6,6-tetramethylpiperidine nitroxide radicals have been receiving more and more attention from people owing to their thermal stability and application for protecting polymer materials from photo-oxidation and p...The 2,2,6,6-tetramethylpiperidine nitroxide radicals have been receiving more and more attention from people owing to their thermal stability and application for protecting polymer materials from photo-oxidation and photo-degradation. In their EI mass spectra the relative intensity of the peak of the nitroxide radical with mass number (FW+1) is usually greater than that calculated according to its natural abundance of elemental composition of the FW peak, and sometimes even greater than that of the FW peak. Therefore, it was difficult to assign the formula weight (FW) of nitroxide radical by the EI method.展开更多
文摘The 2,2,6,6-tetramethylpiperidine nitroxide radicals have been receiving more and more attention from people owing to their thermal stability and application for protecting polymer materials from photo-oxidation and photo-degradation. In their EI mass spectra the relative intensity of the peak of the nitroxide radical with mass number (FW+1) is usually greater than that calculated according to its natural abundance of elemental composition of the FW peak, and sometimes even greater than that of the FW peak. Therefore, it was difficult to assign the formula weight (FW) of nitroxide radical by the EI method.
