Beitrag zur Physik der Fette - Über ein neues verbessertes Meßverfahren zur Erfassung und Bewertung der Erstarrungseigenschaften von Fetten
✍ Scribed by Baenitz, W.
- Publisher
- John Wiley and Sons
- Year
- 1984
- Weight
- 242 KB
- Volume
- 86
- Category
- Article
- ISSN
- 0931-5985
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✦ Synopsis
0-R' resulting from the P-cleavage and also C,H,+ radical. The corresponding 0-cleavage ion CH,-0-R' in ASE appears at m/e 71.
Series ofpeaks at m/e 41, 55,69,83,97,111,125,139 etc., are present in both the spectra are due to R-2H ions of stearyl radical. The peak at m/e 281 in ASE and VSE spectra is due to the loss of methyl and ethyl ra&cals from the molecular ions respectively.
Contrast features:
Essentially the spectra belonging to ASE and VSE are identical in many respects except for the peak m/e 2.50 which is in higher abundance in VSE than in ASE. This is due to the fact that the loss of ethanol (M-46) occurs in VSE more predominantly when the alkyl chain R has more than 5 carbon atoms '. Similar phenomenon is also observed in ASE due to the loss of propyl alcohol (M-60).
In the 15 eV spectra of these two monomers (Figures 5b andSb) hydrocarbon ions produced via secondary decomposition were depressed and the molecular ion M, M-15 and oxygen containing peaks are enhanced. Thus the base peak at m/e 58 in M E (Fig. 5b) is due to the rearrangement ion from the a-cleavage. Otherwise the spectra are identical.
The major six peaks of mass spectra at 70 eV and 15 eV of six vinyl monomers under the study are tabulated in the Table 1 as per ASTM Mass Spectral Data Book I.