Abstract
Intumescent materials, 3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro-[5,5]-undecane-3,9-dioxide and 3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro-[5,5]-undecane having the capacity to produce dehydrating agent, blowing agent, and undergo carbonization during burning have been synthesized. The thermal behavior of the synthesized materials was investigated using differential thermal analysis, thermal volatilization analysis, programmed vacuum pyrolysis–mass spectrometry, flash pyrolysis–mass spectrometry and off-line pyrolysis–gas chromatography–mass spectrometry. The materials show exothermic degradation after 250 °C. Monitoring the release of hydrogen chloride and water, the blowing agents for the production of carbon foam, clearly indicated the superior performance of the pentavalent phosphorus compound over the trivalent phosphorus compound. The major gaseous degradation products released during pyrolysis showed the presence of sufficient quantities of several alkyl-substituted benzenes and fused aromatics. Suitable degradation mechanism has been proposed and discussed to explain the formation of various organics during thermal degradation.
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Acknowledgements
This work was financially supported by Indira Gandhi Centre for Atomic Research (IGCAR) Kalpakkam, India, under the project no. IGCAR/SG/RSD/RI/2007/KCE&T_1. The authors would like to thank the Principal and Managing Board of Kamaraj College of Engineering and Technology, K. Vellakulam Post 625701 and Thiagarajar College of Arts and Science (Autonomous), Madurai 625009, India for providing facilities to carry out this project successfully.
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Vijayakumar, C.T., Mathan, N.D., Sarasvathy, V. et al. Synthesis and thermal properties of spiro phosphorus compounds. J Therm Anal Calorim 101, 281–287 (2010). https://doi.org/10.1007/s10973-010-0714-z
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DOI: https://doi.org/10.1007/s10973-010-0714-z