The efforts of bromine containing ale retardants on the polymerization of styrene have been studied. With the addition of fire retardant, rate of polymerization was not affected but molecular weight of polystyrene was decreased considerably. Since these results were considered on account of chain transfer to fire retardant molecules, the chain transfer constant of each fire retardant was determined on the styrene polymerization initiated by 2,2''-azobisisobuty-ronitrile at 60℃. Thechain transfer constants obtained are as follows ; 4,4''-isopropylidenebis (2,6-dibromophenol) : 129.0×10^-4, hexabronlodipheny1 oxide: 61.3×10-4, octabromodiphenyl oxide: 127.7×10^-4, 2,4,6-tribromopheny1 1,3-dibramoisobutyl ether: 55.1×10^-4 hexabromocy-clodcdecane: 21.5×10^-4, his (2,3-dibromopropy1) dichloropropyl phosphate: 19.6×10^-4 tris(2,3-dibromopropy1) phosphate: 11.9×10^-4. These values were compared with each other and the reactivity of ale retardants was discussed on the view of their molecular structure.

Polystyrene에 대한 난연효과가 우수한 8종의 bromine계 난연제가 styrene의 중합반응에 미치는 영향을 조사하였다. 그 결과 난연제의 첨가에 의하여 중합반응 속도에는 거의 영향이 없었으나 생성된 중합체에 분자량은 저하되었다. 이는 난연제의 연쇄이동반응에 기인한다고 생각되어 60℃에서 styrene 중합에 대한 각 난연제의 연쇄이동정수를 구하였으며 그 각각의 값들을 분자구조와 연관시켜 서로 비교설명하였다.

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