• Determination of Chain Transfer Constant in the Synthesis of Poly(vinyl acetate) mono Thiol by Thiolacetic acid : Ⅱ
  • Lee SY, Shin YJ
  • 티올초산에 의한 폴리초산비닐모노티올의 합성시 연쇄이동상수의 측정 : Ⅱ
  • 이서용, 신영조
Abstract
Free radical polymerization of thiolacetic acid onto vinyl acetate was investigated in the methyl alcohol medium by using 2,2'-azobisisobutyronitrile as initiator. The number-ave age degree of polymerization were measured by gel permeation chromatography (GPC)-viscometric method. In addition, the chain transfer constant(Cχ) was determined by using the Mayo equation. It was determined to be 0.186 at 60℃. It was found that chain transfer constant was an effective ordering factors as a forecast of free radical polymerization reactivity for vinyl acetate and thiolacetic acid. Therefore, It was also shown that thiolacetic acid can be commercially used as not only a chain transfer agent for poly(vinyl acetate) mono thiol (PVACT) but also a effective compound for thiol functional group in the free radical polymerization.

초산비닐과 티올초산의 자유 라디칼 중합을 메틸알코을 용액중에서 중합 개시제로서 아조비스이소부티로니트릴을 사용하여 행하였다 수평균중합도는 gel permeation chromatography(GPC)-viscometry방법에 의해 측정하였으며, 아울러 연쇄이동상수는 Mayo의 방정식으로 구하였다. 초산비닐에 대한 티올초산의 연쇄이동상수는 온도 60℃에서 0.186이었다. 이 값은 초산비닐과 티올초산에 대한 자유 라디칼 중합의 활성을 예측하는 효과적인 지표인자임을 알았다. 따라서 티올초산은 자유 라디칼 중합에서 연쇄이동제 뿐만 아니라 티올기의 유용한 공급물질로서도 실용적으로 사응 가능함을 알았다.

Keywords: free radical polymerization; vinyl acetate; thiolacetic acid; chain transfer constant; Mayo equation

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This Article

  • 1996; 20(2): 233-240

    Published online Mar 25, 1996