Abstract
This paper deals with the effective flame retardance of polystyrene and polypropylene with aliphatic bromine compounds. By studying glow wire and UL94 V2 performance of aliphatic hexabromocyclododecane in polystyrene and the mixed aliphatic/aromatic compound tetrabromobisphenol A bis (2,3-dibromopropyl ether) in polypropylene with and without synergists like antimony trioxide and dicumene, it is made plausible that the combination of chain scission and flame poisoning mechanisms causes these compounds to be so effective. The effectiveness of a synergist depends on the use ratio and can be negative depending on the FR test. Also the effect of neutral fillers like talc is studied and it is shown that particle size has the strongest effect on the FR test which depends most on polymer flow. The effect of polymer molecular weight is in line with the mechanisms involved.
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