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Thermal Decomposition Kinetics of Functionalized Polynorbornene

Published online by Cambridge University Press:  31 January 2011

Michael D. Wedlake  and
Paul A. Kohl
Michael D. Wedlake
Affiliation:
School of Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100
Paul A. Kohl*
Affiliation:
School of Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The mechanism and kinetic parameters for the thermal decomposition of four functionalized addition-polymerized polynorbornenes were studied by dynamic and isothermal thermogravimetric analyses and by mass spectrometry. The dynamic and isothermal thermogravimetric analyses showed a first-order degradation reaction mechanism with an activation energy of 229.6 ± 12.5 kJ/mol. Based on the polymer structure, reference mass spectra for related molecules, and a cross-comparison of the mass spectra, the backbone, free-radical scission mechanism was found to occur by cleavage of the linkages between bicyclic rings and the production of volatile monomer and oligomers. The degradation of polynorbornene occurred via a depropagation and transfer reaction process. Initially, the depropagation pathway was preferred, but with increasing conversion, intra- and intermolecular hydrogen transfer reactions dominated.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 3 , March 2002 , pp. 632 - 640
Copyright
Copyright © Materials Research Society 2002

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