The effects of some transition-metal compounds on the flame retardance of poly(styrene- co-4-vinyl pyridine) and poly(methyl methacrylate- co-4-vinyl pyridine)

Several copolymers of both styrene and methyl methacrylate with 4-vinyl pyridine have been prepared and modified by coordination with the transition-metal compounds vanadium acetylacetonate (VO[acac] 2), vanadyl dichloride (VOCl 2) and ferric chloride. The flame-retardant effects of these modificati...

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Bibliographic Details
Published in:Polymer degradation and stability 1998-01, Vol.60 (2), p.401-407
Main Authors: Ebdon, John R., Guisti, Lionel, Hunt, Barry J., Jones, Mark S.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Inorganic and organomineral polymers
Physicochemistry of polymers
Properties and characterization
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Summary:Several copolymers of both styrene and methyl methacrylate with 4-vinyl pyridine have been prepared and modified by coordination with the transition-metal compounds vanadium acetylacetonate (VO[acac] 2), vanadyl dichloride (VOCl 2) and ferric chloride. The flame-retardant effects of these modifications have been assessed by measurements of limiting oxygen indices, by thermogravimetric analysis, and by examination of chars by scanning electron microscopy. Effects on mechanical properties have been assessed by dynamic mechanical thermal analysis. The limiting oxygen indices of the modified polymers are significantly higher than those of the parent polymers, and the production of considerable amounts of rigid, intumescent chars suggests predominantly condensed-phase mechanisms of flame retardance.
ISSN:0141-3910
1873-2321
DOI:10.1016/S0141-3910(97)00100-6