Thermal Decomposition Chemistry of Poly(vinyl alcohol).
Thermal Decomposition Chemistry of Poly(vinyl alcohol).
(1343 K)
Gilman, J. W.; VanderHart, D. L.; Kashiwagi, T.
Chapter 11; ACS Symposium Series 599;
American Chemical Society. Fire and Polymers II:
Materials and Tests for Hazard Prevention. National
Meeting, 208th. ACS Symposium Series 599. August 21-26,
1994, Washington, DC, American Chemical Society,
Washington, DC, Nelson, G. L., Editor(s), 161-185 pp,
1995.
Keywords:
fire retardants; flame retardants; thermal
decomposition; char formation; additives; flammability;
pyrolysis; morphology; residues; gasification;
thermogravimetric analysis; polyvinyl acetate;
calorimetry
Abstract:
The fundamental condensed phase processes which lead to
char formation during the fire-like pyrolysis of
poly(vinyl alcohol), PVA, and PVA-containing maleimides
were characterized using CPM/AS 13C NMR. In addition to
evidence of the well known chain-stripping elimination
of H2O and the chain-scission reactions, which occur
during the pyrolysis of pure PVA, evidence is presented
in support of cyclization and radical reaction pathways
responsible for the conversion of unsaturated carbons
into aliphatic carbons. Two general mechanisms; one
described as a physical encapsulation, and the other a
lowering of the average volatility of certain
degradation products, are proposed for the primary modes
of action of maleimides on the pyrolysis of PVA.
