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Results of angular correlation of annihilation radiation and positron annihilation lifetime measurements are presented for five styrene copolymers: poly(co-styrene-phenylmaleimide) and its three derivatives with chlorine as well as foτ one with the OH group substituted in the benzene ring. Ht occurs that the chlorine substituted in three different positions in the benzene ring poly(co-styrene-o (or -m, -p)-chlorophenylmaleimide) inhibits the formation of the positronium to different extent. Thedoi:10.12693/aphyspola.88.51 fatcat:cluojs6dh5bw7fry26exxuc34q