Kinetics of thermal degradation of intumescent flame-retardant spirophosphates

The thermal degradation behaviour of various spirophosphates synthesized using SDP (phenol), SDOC ( o -cresol), SDMC ( m -cresol), SDPC ( p -cresol), SDDMP (2,4-dimethylphenol) and SDTMP (2,4,6-trimethylphenol) with 3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro-[5,5]-undecane-3,9-dioxide (SDCDP)...

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Bibliographic Details
Published in:Bulletin of materials science 2021-12, Vol.44 (1), p.15, Article 15
Main Authors: Mathan, N David, Ponraju, D, Vijayakumar, C T
Format: Article
Language:English
Subjects:
Activation energy
Approximation
Chemistry and Materials Science
Engineering
Flame retardants
Fourier transforms
Kinetics
Materials Science
Phenols
Phosphorus
Temperature
Thermal degradation
Thermogravimetric analysis
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Summary:The thermal degradation behaviour of various spirophosphates synthesized using SDP (phenol), SDOC ( o -cresol), SDMC ( m -cresol), SDPC ( p -cresol), SDDMP (2,4-dimethylphenol) and SDTMP (2,4,6-trimethylphenol) with 3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro-[5,5]-undecane-3,9-dioxide (SDCDP) are investigated using thermogravimetric analyzer. The spirophosphates show multistage degradations in the temperature range 180–550°C. The second stage of degradation is more prominent and the substituent effect is clearly reflected at this stage of degradation. The compound SDP showed superior performance since it has the greatest char yield value (44%) and LOI value (27%). The model free kinetic methods of Flynn-Wall-Ozawa and Vyazovkin methods are used to calculate the apparent energy of activation for the thermal degradation ( E a -D) of these spirophosphates. The material SDTMP showed the highest E a -D values.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-020-02317-x