Main functions of iron compounds as smoke suppressant in poly(vinyl chloride) combustion

Journal Article · Sun May 01 04:00:00 EDT 1983 · J. Appl. Polym. Sci.; (United States)

DOI:https://doi.org/10.1002/app.1983.070280503· OSTI ID:5537194

Michel, A ^[1]; Van Hoang, T; Bussiere, P; Guyot, A

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1. Laboratoire des Materiaux Organiques, France

Whatever the state of the iron compounds as smoke suppressant during the combustion of poly(vinyl chloride), they lead rapidly to native ..cap alpha..Fe/sub 2/O/sub 3/ in the char residue left after dehydrochlorination. It causes incandescence of the char residue and catalyzes its oxidation into carbon monoxide and carbon dioxide that contributes to decreasing the amount of available carbon for the soot formation after self-ignition. FeCl/sub 2/ and FeCl/sub 3/ are the precursors of ..cap alpha..Fe/sub 2/O/sub 3/, which is the true compound as smoke suppressant. Nevertheless, as intermediate, iron chlorides are able to modify the degradation processes, and they favor the formation of light tars instead of heavy tars. For that reason the iron compounds cause the formation of smoke at lower temperature than for pure PVC, but, as ..cap alpha..Fe/sub 2/O/sub 3/ is formed, the smoke production levels off and then decreases. The higher the ease of the iron compounds to give chlorides through reaction with HCl and further native ..cap alpha..Fe/sub 2/O/sub 3/, the higher the ease of the additive to cause the oxidation of the char residue sooner and in consequence to decrease the smoke level. In the PVC combustion three main steps may be distinguished: dehydrochlorination step between 200-300/sup 0/C; tars aerosols formation from the char residue between 300/sup 0/C and self-ignition; at temperature higher than self-ignition, formation of soot from the previous tars as precursors.

• OSTI ID: 5537194
• Journal Information: J. Appl. Polym. Sci.; (United States), Journal Name: J. Appl. Polym. Sci.; (United States) Vol. 28:5; ISSN JAPNA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360404* -- Materials-- Polymers & Plastics-- Physical Properties-- (-1987)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINATED ALIPHATIC HYDROCARBONS
CHLORINE COMPOUNDS
COMBUSTION
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HIGH TEMPERATURE
IRON CHLORIDES
IRON COMPOUNDS
IRON OXIDES
MEDIUM TEMPERATURE
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLYMERS
POLYVINYLS
PVC
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
USES