Thermal degradation of cross-linked polyisoprene and polychloroprene

D.D. Jiang, G.F. Levchik, S.V. Levchik, C. Dick, J.J. Liggat, Colin Snape, C.A. Wilkie

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Polyisoprene and polychloroprene have been cross-linked either in solution or in solid state using free radical initiators. In the comparable experimental conditions higher cross-linking density was observed in the solid state process. Independent of the cross-linking method, polychloroprene tended to give a higher gel content and cross-link density than does polyisoprene. Infrared characterization of the cross-linked materials showed cis-trans isomerization occurred in the polyisoprene initiated by benzoyl peroxide, whereas no isomerization was found in the samples initiated by dicumyl peroxide. Polyisoprene does not cross-link by heating in a thermal analyzer, whereas polychloroprene easily undergoes cross-linking in such conditions. Infrared spectroscopy showed that in the case of polyisoprene, rearrangements occur upon heating which lead to the formation of terminal double bonds, while polychloroprene loses hydrogen chlorine which leads to a conjugated structure. There is apparently some enhancement of the thermal and thermal oxidative stability of polyisoprene because of the cross-linking. Cross-linked polychloroprene is less thermally stable than the virgin polymer. Cross-linking promotes polymers charring in the main step of weight loss in air, which leads to enhanced transitory char.
Original languageEnglish
Pages (from-to)75-82
Number of pages7
JournalPolymer Degradation and Stability
Volume68
Issue number1
DOIs
Publication statusPublished - 1 Apr 2000

Fingerprint

Neoprene
polyisoprenes
Polyisoprenes
thermal degradation
Pyrolysis
peroxides
Isomerization
isomerization
Polymers
charring
Benzoyl Peroxide
solid state
Heating
Benzoyl peroxide
heating
Chlorine
polymers
initiators
Peroxides
Free radicals

Keywords

  • thermal degradation
  • cross-linked
  • polyisoprene
  • polychloroprene

Cite this

Jiang, D. D., Levchik, G. F., Levchik, S. V., Dick, C., Liggat, J. J., Snape, C., & Wilkie, C. A. (2000). Thermal degradation of cross-linked polyisoprene and polychloroprene. Polymer Degradation and Stability, 68(1), 75-82. https://doi.org/10.1016/S0141-3910(99)00167-6
Jiang, D.D. ; Levchik, G.F. ; Levchik, S.V. ; Dick, C. ; Liggat, J.J. ; Snape, Colin ; Wilkie, C.A. / Thermal degradation of cross-linked polyisoprene and polychloroprene. In: Polymer Degradation and Stability. 2000 ; Vol. 68, No. 1. pp. 75-82.
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Jiang, DD, Levchik, GF, Levchik, SV, Dick, C, Liggat, JJ, Snape, C & Wilkie, CA 2000, 'Thermal degradation of cross-linked polyisoprene and polychloroprene', Polymer Degradation and Stability, vol. 68, no. 1, pp. 75-82. https://doi.org/10.1016/S0141-3910(99)00167-6

Thermal degradation of cross-linked polyisoprene and polychloroprene. / Jiang, D.D.; Levchik, G.F.; Levchik, S.V.; Dick, C.; Liggat, J.J.; Snape, Colin; Wilkie, C.A.

In: Polymer Degradation and Stability, Vol. 68, No. 1, 01.04.2000, p. 75-82.

Research output: Contribution to journalArticle

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T1 - Thermal degradation of cross-linked polyisoprene and polychloroprene

AU - Jiang, D.D.

AU - Levchik, G.F.

AU - Levchik, S.V.

AU - Dick, C.

AU - Liggat, J.J.

AU - Snape, Colin

AU - Wilkie, C.A.

PY - 2000/4/1

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N2 - Polyisoprene and polychloroprene have been cross-linked either in solution or in solid state using free radical initiators. In the comparable experimental conditions higher cross-linking density was observed in the solid state process. Independent of the cross-linking method, polychloroprene tended to give a higher gel content and cross-link density than does polyisoprene. Infrared characterization of the cross-linked materials showed cis-trans isomerization occurred in the polyisoprene initiated by benzoyl peroxide, whereas no isomerization was found in the samples initiated by dicumyl peroxide. Polyisoprene does not cross-link by heating in a thermal analyzer, whereas polychloroprene easily undergoes cross-linking in such conditions. Infrared spectroscopy showed that in the case of polyisoprene, rearrangements occur upon heating which lead to the formation of terminal double bonds, while polychloroprene loses hydrogen chlorine which leads to a conjugated structure. There is apparently some enhancement of the thermal and thermal oxidative stability of polyisoprene because of the cross-linking. Cross-linked polychloroprene is less thermally stable than the virgin polymer. Cross-linking promotes polymers charring in the main step of weight loss in air, which leads to enhanced transitory char.

AB - Polyisoprene and polychloroprene have been cross-linked either in solution or in solid state using free radical initiators. In the comparable experimental conditions higher cross-linking density was observed in the solid state process. Independent of the cross-linking method, polychloroprene tended to give a higher gel content and cross-link density than does polyisoprene. Infrared characterization of the cross-linked materials showed cis-trans isomerization occurred in the polyisoprene initiated by benzoyl peroxide, whereas no isomerization was found in the samples initiated by dicumyl peroxide. Polyisoprene does not cross-link by heating in a thermal analyzer, whereas polychloroprene easily undergoes cross-linking in such conditions. Infrared spectroscopy showed that in the case of polyisoprene, rearrangements occur upon heating which lead to the formation of terminal double bonds, while polychloroprene loses hydrogen chlorine which leads to a conjugated structure. There is apparently some enhancement of the thermal and thermal oxidative stability of polyisoprene because of the cross-linking. Cross-linked polychloroprene is less thermally stable than the virgin polymer. Cross-linking promotes polymers charring in the main step of weight loss in air, which leads to enhanced transitory char.

KW - thermal degradation

KW - cross-linked

KW - polyisoprene

KW - polychloroprene

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DO - 10.1016/S0141-3910(99)00167-6

M3 - Article

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SN - 0141-3910

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ER -