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Structure and stability of halogenated polymers: Part 4—Chain brominated polystyrene

1989; Elsevier BV; Volume: 25; Issue: 1 Linguagem: Inglês

10.1016/0141-3910(89)90118-3

1873-2321

I.C. McNeill, Mehmet Çoşkun,

Environmental Chemistry and Analysis

Bromination of polystyrene in the absence of air but in the presence of a free radical initiator gives a brominated polystyrene in which the bromine atoms on the backbone are on the same carbon as the phenyl substituent. There is also a small amount of substitution by bromine in the para position in the aromatic ring. Bromination under these conditions is accompanied by some chain scission, the extent of chain scission being greater than that previously observed in the ring chlorination, ring bromination and chain chlorination studies of polystyrene previously reported. Chain brominated polystyrene shows some resemblance to chain chlorinated polystyrene in its stability and degradation behaviour. It degrades in two stages, the first giving hydrogen bromide and the second producing chain fragments. Less hydrogen bromide is produced than expected and some bromine is present in the major product fraction which consists of chain fragments. There is a black residue after degradation to 500°C under vacuum, which remains soluble.