SPECIAL FEATURES OF THE OXYGEN QUENCHING OF PHOSPHORESCENCE OF BROMINATED ARENES IN POLYSTYRENE AND BUTADIENE-STYRENE BLOCK-COPOLYMERS

Study of the phosphorescence of brominated aromatic hydrocarbons in po lystyrene, synthetic diene rubber, and butadiene-styrene block-copolym er showed that the additives were concentrated predominantly in the PS phase of the block-copolymer. The distribution constants are 4.0, 1.3 , 3.1, and 1.7 for 9-bromophenanthrene, 2-bromonaphthalene, 4,4'-dibro modiphenyl, and 5-bromoacenaphthene, respectively. The efficiency of p hosphorescence quenching by oxygen is higher in PS than in the block c opolymer. The concentration dependence of the quenching efficiency can be described by a modified Stern-Volmer equation that takes into acco unt the unequivalence of the particle distribution.