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Effects of brominated flame retardants and crosslinking agents on the flame retardancy of rubbers
Author(s) -
Yang ChinPing,
Chen WenTung
Publication year - 1988
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.1988.070360418
Subject(s) - ether , flammability , materials science , polymer chemistry , fire retardant , polymer , natural rubber , bromine , copolymer , organic chemistry , chemistry
Tetrabromo‐ p ‐cresol (TBPC), pentabromophenol (PBP), and their allyl ether derivatives—tetrabromo‐ p ‐cresol allyl ether (TBPC–AE) and pentabromophenol allyl ether (PBP–AE)—were used in the study of flame retardancy of ethylene–vinyl acetate (EVA) copolymer and styrene–butadiene rubber (SBR), which were cured by dicumyl peroxide (DCP) and sulfur, respectively. The dependence of the flammability of crosslinking polymers on the polymer matrix, its additives, and the degree of crosslinking was investigated. The empirical equations of flame retardancy were established for these rubbers and compared with the measured values. It was found that the oxygen index of SBR–S system was in accordance with the empirical equations, while the EVA–DCP system, affected by the decomposed residue of DCP, showed a slight deviation. The brominated phenolic compounds of allyl ether (BPs–AE) showed a greater deviation than their precursors. This may be due to the fact that allyl group could react with DCP and lose its excellent flame resistance characteristic, which may be caused by the modified Claisen rearrangement produced in the thermal processing or burning. The phenolic brominated compounds containing the allyl group and a higher bromine content showed better flammability.