• français
    • English
    français
  • Login
Help
View Item 
  •   Home
  • Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)
  • View Item
  • Home
  • Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Oxidation of unvulcanized, unstabilized polychloroprene: A kinetic study

Article dans une revue avec comité de lecture
Author
LE GAC, Pierre Yves
ROUX, Gérard
VERDU, Jacques
DAVIES, Peter
ccFAYOLLE, Bruno
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/8766
DOI
10.1016/j.polymdegradstab.2014.06.019
Date
2014
Journal
Polymer Degradation and Stability

Abstract

Thermal oxidation in air at atmospheric pressure, in the 80-140 °C temperature range and in oxygen at 100 °C in the 0.02-3 MPa pressure range, of unvulcanized, unstabilized, unfilled polychloroprene (CR) has been characterized using FTIR and chlorine concentration measurement. The kinetic analysis was focused on double bond consumption. A mechanistic scheme involving unimolecular and bimolecular hydroperoxide decomposition, oxygen addition to alkyl radicals, hydrogen abstraction on allylic methylenes, alkyl and peroxyl additions to double bonds and terminations involving alkyl and peroxy radicals was elaborated. The corresponding rate constants were partly extracted from the literature and partly determined from experimental data using the kinetic model derived from the mechanistic scheme in an inverse approach. Among the specificities of polychloroprene, the following were revealed: The rate of double bond consumption is a hyperbolic function of oxygen pressure that allows a law previously established for the oxidation of saturated substrates to be generalized. CR oxidation is characterized by the absence of an induction period that reveals the instability of hydroperoxides. The kinetic analysis also reveals that peroxyl addition is faster than hydrogen abstraction but slower in CR than in common hydrocarbon polydienes.

Files in this item

Name:
PIMM-PDS-LE GAC-2014.pdf
Size:
1.573Mb
Format:
PDF
View/Open

Collections

  • Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

Related items

Showing items related by title, author, creator and subject.

  • Water clustering in polychloroprene 
    Article dans une revue avec comité de lecture
    LE GAC, Pierre Yves; ROUX, Gérard; DAVIES, Peter; VERDU, Jacques; ccFAYOLLE, Bruno (Elsevier, 2014)
    Water sorption has been studied gravimetrically for polychloroprene rubber samples, first at a fixed hygrometric ratio (98% HR) and several temperatures (25, 40, 60 and 80 °C) for samples of 1.8 and 3.8 mm thickness (Constant ...
  • Role of strain induced crystallization and oxidative crosslinking in fracture properties of rubbers 
    Article dans une revue avec comité de lecture
    LE GAC, Pierre Yves; BROUDIN, Morgane; ROUX, Gérard; VERDU, Jacques; DAVIES, Peter; ccFAYOLLE, Bruno (Elsevier, 2014)
    Tensile properties and crack propagation properties, especially critical strain energy release rate in mode I, GIC, have been used to investigate fracture properties of elastomers and their relationships with microstructure. ...
  • Predictive ageing of elastomers: Oxidation driven modulus changes for polychloroprene 
    Article dans une revue avec comité de lecture
    LE GAC, Pierre Yves; CELINA, Mathew C.; ROUX, Gérard; VERDU, Jacques; DAVIES, Peter; ccFAYOLLE, Bruno (Elsevier, 2016)
    The oxidative ageing in the range of 60 °C–140 °C of sulfur vulcanized polychloroprene has been studied by FTIR spectroscopy (double bond consumption), modulus changes and oxygen absorption measurements. Experiments were ...
  • Relationship between macromolecular network and fatigue properties of unfilled polychloroprene rubber 
    Article dans une revue avec comité de lecture
    LE GAC, Pierre-Yves; ALBOUY, Pierre-Antoine; VERDU, Jacques; ccFAYOLLE, Bruno (Elsevier, 2021)
    Fatigue life of unfilled polychloroprene rubber is characterized in fully relaxing (R = 0) and non-relaxing conditions (R = 0.2) for more than 15 network structures. Network changes are induced by thermal oxidation ageing ...
  • Thermooxidative aging of polydicyclopentadiene in glassy state 
    Article dans une revue avec comité de lecture
    LE GAC, Pierre Yves; VERDU, Jacques; LE GAC, Pierre Yves; ccRICHAUD, Emmanuel (Elsevier, 2014)
    Thermal aging of thin films of unstabilized polydicyclopentadiene (pDCPD) at several temperatures ranging from 120 to 30 C was investigated by means of carbonyl build up by FTIR with ammonia derivatization, double bond ...

Browse

All SAMCommunities & CollectionsAuthorsIssue DateCenter / InstitutionThis CollectionAuthorsIssue DateCenter / Institution

Newsletter

Latest newsletterPrevious newsletters

Statistics

Most Popular ItemsStatistics by CountryMost Popular Authors

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales