Infrared Spectroscopic Studies on Some Thermally Degraded Poly(methyl methacrylate) Doped with N,N,N´,N´- tetraoxaloyl Para Sulphanilamide

Abstract

 
INFRARED (IR) spectroscopic studies were performed for some …..poly (methyl methacrylate)(PMMA) samples prepared in absence and presence of N,N,N`,N`-tetraoxaloyl-p-sulphanilamide after the extraction of the dopant during thermal treatment. There were no drastic changes in the IR absorption bands position, but noticeable changes in the band intensities were found. The relative transmission of IR absorption bands, such as those at 1070, 1242, 1444 and 1730 cm-1, were measured with respect to the transmission of the methyl group band at 1388 cm-1 (the most stable band during thermal treatment). By using the combined technique of transmission data of C-C skeletal vibration C-O, CH2 and C=O bands with respect to the transmission band of methyl group and measuring the area under the curve for the degradation and recombination zones, the protection efficiency of the organic dopant in the PMMA matrix against thermal degradation could be explained.
The protection mechanism of the organic dopant was confirmed by measuring the mass spectrum of the organic dopant for determination of different organic radicals that could be produced during thermolysis. Measuring 13C-NMR of the PMMA-organic dopant after the extraction of the dopant confirms the presence of phenyl moieties in the polymeric chains.
The degradation and recombination mechanism of different groups in the polymeric chain units or backbone scission during thermal treatment could be explained by the behavior of the relative transmission data with increasing temperature. The protection efficiency of the organic dopant was found to be the maximum in presence of 7% of the organic dopant in the PMMA matrix.

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History

  • Receive Date: 11 November 2012
  • Revise Date: 10 June 2013
  • Accept Date: 11 June 2013

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