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Degradation of Virgin and Modified Chlorine Containing Polymers

  • F. Tüdős
  • B. Iván
  • T. Kelen
  • J. P. Kennedy
Chapter

Summary

Thermal and thermooxidative degradation of labile tertiary and/or allylic chlorine containing polymers, PVC, polychloroprene (CR), chlorinated butyl rubber (Cl-IIR), chlorinated ethylene-propylene copolymers (Cl-EPM) and polyisobutylenes (PIB) carrying tertiary chlorine chain ends have been studied.

PVCs possessing increased concentrations of internal allylic chlorines, PVC(A)s,have been prepared by controlled chemical dehydrochlorination. Tertiary chlorine containing PVCs have been synthesised by copolymerisation of vinyl chloride with 2-chloropropene. Both allylic and tertiary chlorines significantly decrease the thermal and thermooxidative stability of the resin. Systematic thermal degradation studies using a number of techniques (HCl loss, ultraviolet and visible spectroscopy, ozonolysis, gel permeation chromatography measurements) in inert solution prove quantitatively that random initiation of HCl loss at normal—CH2—CHCl— repeat units also takes place. The rate constant of this process is lower by four orders of magnitude than the rate constant for initiation of HCl loss at internal allylic chlorines.

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Copyright information

© Springer Science+Business Media Dordrecht 1985

Authors and Affiliations

  • F. Tüdős
    • 1
  • B. Iván
    • 1
  • T. Kelen
    • 1
  • J. P. Kennedy
    • 2
  1. 1.Central Research Institute for ChemistryHungarian Academy of SciencesBudapestHungary
  2. 2.Institute of Polymer ScienceUniversity of AkronUSA

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