The effect of various experimental conditions on the formation of carboxyl-ter-minated polybutadiene liquid-rubbers prepared by free-radical initiation were investigated with 4, 4''-Azobis (4-cyano-valeric acid) as initiator. TLC separation of polymers by the difference in end-group was applied to the determination of functionality distributions in liquid rubbers. It was found that the liquid rubbers formed in the present free-radical polymerizations have functionalities greater than 2.0. The results of TLC separation indicated that the products include neither no functional nor mono-functional component, while the mono-functionality has been generally found. These lead to the conclusion that termination mechanism in the presently investigated butadiene polymerization in predominately by coupling reaction.

중합개시제로 4,4''-Azobis (4-cyano-valeric acid)를 사용하여 free-radical 중합법에 의해 중합체의 말단에 carboxyl기를 함유하는 액상고무의 생성에 미치는 제영향을 검토하였다. 액상고무의 관능기분포를 결정하기 위하여 중합체의 말단기 차이에 의한 TLC 분리법이 적용 되었다. 생성된 액상고무의 관능도는 2.0보다 큰 값으로 나타났으며, TLC분리의 결과 무관능성 및 1관능성의 연쇄는 생셩되지 않았음을 알았다. 이 결과는 butadiene의 연쇄정지반응이 결합반응에 의해 압도적으로 일어났음을 시사해 준다.

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