Effect of metal oxides on the thermal degradation of polychloroprene and chlorosulfonated polyethylene

Polychloroprene (PCP) and chlorosulfonated polyethylene (CSM) rubbers undergo a multiple step degradation pathway involving a common dehydrochlorination step which causes HCl release from the macromolecules as evidenced by thermogravimetric analyses associated with operando FTIR analyses. Dehydrochl...

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Bibliographic Details
Published in:Polymer degradation and stability 2019-01, Vol.159, p.90-97
Main Authors: Rijal, Bidur, Klipfel, Florian, Dez, Isabelle, Colin, Jean, Bazin, Philippe, Arethuse, Franck, Tellier, Emmanuel, Le Pluart, Loïc
Format: Article
Language:English
Subjects:
Biodegradation
Bismuth oxides
Bismuth trioxide
Chemical reactions
Chlorosulfonated polyethylene
Dehydrochlorination
Fillers
Heat treatment
Lanthanum oxides
Lead free
Macromolecules
Metal oxides
Neoprene
Organic chemistry
Physics
Polychloroprene
Polyethylene
Polyethylenes
Recyclability
Thermal degradation
Thermal stability
Thermogravimetric analysis
Transition metal oxides
Transition metals
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Summary:Polychloroprene (PCP) and chlorosulfonated polyethylene (CSM) rubbers undergo a multiple step degradation pathway involving a common dehydrochlorination step which causes HCl release from the macromolecules as evidenced by thermogravimetric analyses associated with operando FTIR analyses. Dehydrochlorination is detected at lower temperatures for CSM than for PCP. It is preceded by non-simultaneous and very distinctive desulfonation reaction at even lower temperatures as shown by chemical analyses of the evolved phase during a thermal treatment. Incorporation of Bi2O3, La2O3 and WO3 as potential fillers for lead-free radioprotective materials leads to diverse effect on the thermal stability of these rubbers. Whereas transition metal oxides do not affect the degradation mechanisms, bismuth oxide strongly promotes the dehydrochlorination reaction leading to a decrease of the rubbers thermal stability which is detrimental to the potential processability and recyclability of these materials. •Chlorosulfonated polyethylene (CSM) desulfonation proceeds at lower temperature than dehydrochlorination.•Using bismuth oxide (Bi2O3) as radioprotective filler is detrimental to CSM and polychloroprene thermal stability.•Bismuth oxide promotes dehydrochlorination reaction of chlorinated rubbers.•Transition metal oxides (La2O3, WO3) do not modify rubbers thermal stability.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2018.11.015