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Synthesis of brominated acenaphthylenes and their flame‐retardant effects on ethylene–propylene–diene terpolymer
Author(s) -
Morita Yohsuke,
Hagiwara Miyuki
Publication year - 1982
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1982.070270911
Subject(s) - fire retardant , thermal decomposition , flammability , copolymer , materials science , monomer , polymer chemistry , ethylene , diene , thermal stability , ethylene propylene rubber , reagent , polymer , catalysis , organic chemistry , chemistry , composite material , natural rubber
Bromoacenaphthylenes and their condensates as flame‐retardant reagents were synthesized by bromination of acenaphthylene using ZnCl 2 CF 3 COOH or FeCl 3 as catalysts and subsequent dehydrobromination. The chief components were identified as bromoacenaphthylene monomers when ZnCl 2 CF 3 COOH were used, and as their condensates (mostly trimers) in the case of FeCl 3 . Their performance as flame‐retardant reagents for ethylene–propylene–diene terpolymer (EPDM) was evaluated by measuring the oxygen index of finished compounds, and flammability by a vertical flammability test based on UL‐94‐VO. Both the monomers and the condensates demonstrated high flame‐retardant effectiveness. The high efficiency was attributed to their excellent dispersity in the base polymer and their characteristic thermal decomposition behavior. In TGA, they decomposed in a very wide range of temprature (ca.200–560°C), which covers the decomposition range of EPDM. This was attributed to the existence of bromines of different thermal stabilities in one molecule.