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Thermal Degradation vis-a-vis Thermal Volatilisation of High Polymers


Affiliations
1 R&D Division, MLA Group of Industries Kanpur 208 012, India
2 DMSRDE, Kanpur 208 013, India
     

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Random thermal degradation behaviour of long chain polymers has been studied in detail from the consideration of kinetics of dissociation of bonds vulnerable to thermal activation. In the process, thermogravimetric equations correlating kinetic parameters of the degradation reaction have been developed. Different experimental techniques for evaluation of kinetic parameters have also been devised. An analysis of the results reveals that thermogravimetric weight-loss can be expressed as a Freeman-Carroll type first order reaction having a rate constant that varies over a wide range with the progress of the reaction. High initial molecular weight and high molar cohesion impart retarding influences on thermal volatilisation. Interestingly, the isothermal volatilisation rate is found to pass through a maximum which provides a clue to determination of the kinetic parameters of the degradation reaction.

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  • R T Bailey, A M North and R A Pethrick, Molecular Motion of High Polymers, Oxford University Press, New York, 1981.

  • Elisabeth Schroder, G Mueller and Karl-Friedrich Arndt, Polymer Characterisation, Hanser Publisher, Munich, 1989.

  • E A Turi, Ed, Thermal Characterisation of Polymeric Materials, Academic Press, New York, 1981.

  • S Kole, P P De and D K Tripathy, Polymer, 34, 3732-37, 1993.

  • E S Freeman and B Carroll, J Phys Chem, 62, 394, 1958.

  • E Husemann and G V Schulz, Z Physik Chem, B 52, 1, 1942.

  • Paul J Flory, Principles of Polymer Chemistry, Cornell University Press, ITHACA New York, 1953.

  • J M Coulson, J F Richardson, J R Backhurst and J H Harker, Chemical Engineering, Vol 2, Pergamou

  • Press Oxford, 1978.

  • Robert H Perry and Cecil H Chilton, Chemical Engineers' Handbook, McGraw-Hill, Kogakusha, Tokyo, 1973.

  • S Kole, S Roy and A K Bhowmick, Polymer 35, 3423-26, 1994.

  • S Kole, S Roy and A K Bhowmick, Polymer 36, 3273-77, 1995.


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  • Thermal Degradation vis-a-vis Thermal Volatilisation of High Polymers

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Authors

S. Kole
R&D Division, MLA Group of Industries Kanpur 208 012, India
Arati Kole
DMSRDE, Kanpur 208 013, India

Abstract


Random thermal degradation behaviour of long chain polymers has been studied in detail from the consideration of kinetics of dissociation of bonds vulnerable to thermal activation. In the process, thermogravimetric equations correlating kinetic parameters of the degradation reaction have been developed. Different experimental techniques for evaluation of kinetic parameters have also been devised. An analysis of the results reveals that thermogravimetric weight-loss can be expressed as a Freeman-Carroll type first order reaction having a rate constant that varies over a wide range with the progress of the reaction. High initial molecular weight and high molar cohesion impart retarding influences on thermal volatilisation. Interestingly, the isothermal volatilisation rate is found to pass through a maximum which provides a clue to determination of the kinetic parameters of the degradation reaction.

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No keywords.

References