• Preparation of High Molecular Weight Atactic Poly(vinyl alcohol) by the Low Temperature Suspension Polymerization of Vinyl Acetate
  • Lyoo WS, Lee SG, Lee CJ
  • 아세트산비닐의 저온 현탁중합에 의한 고분자량 혼성배열 폴리비닐알코올의 제조
  • 류원석, 이세근, 이철주
Abstract
To obtain high yield and high molecular weight poly(vinyl acetate) (PVAc) for a precusor of high molecular weight atactic poly(vinyl alcohol) (PVA), vinyl acetate (VAc) was suspension polymerized at 40℃ using a low temperature initiator, 2,2'-azobis (2,4-dimethylvaleronitrile) (ADMVN), and the effects of polymerization conditions on the polymerization behavior and molecular structure of PVAc, and PVA prepared by saponifying PVAc were studied. Lowering the polymerization temperature, implemented by using ADMVN, proved successful in obtaining PVA having number-average degree of polymerization (Pn) of over 3500. Moreover, maximum conversion of VAc into PVAc up to. 96.3% (below 40% in the case of bulk polymerization of VAc at the same condition) was achieved. PVAc having Pn of 8000-15000 was obtained, and the degree of branching for acetyl group was ca. 1.5-3.5 at conversion of 50-95%. By saponifying the prepared PVAc, PVA having maximum Pn of over 4500 was obtained. The syndiotactic diad content of PVA was nearly constant ranging 51.5-52.5% and independent of the Pn of PVA.

고분자량 혼성배열 폴리비닐알코올(poly(vinyl alcohol) (PVA))의 전구체인 고분자량 폴리아세트산비닐 (poly(vinyl acetate) (PVAc))을 고수율로 제조하기 위하여 40℃에서 저온 개시제인 아조비스디메틸발레로니트릴 (2,2'-azobis(2,4-dimethylvaleronitrile) (ADMVN))을 개시제로 사용하여 아세트산비닐의 현탁중합을 시행하였으며 중합인자가 PVAc와 그의 비누화로부터 얻어지는 PVA의 중합거동과 분자구조에 미치는 영향을 고찰하였다. ADMVN의 사용에 의한 낮은 중합온도 때문에 수평균 중합도 3500 이상을 갖는 PVA를 얻을 수 있었다. 또한, VAc의 PVAc로의 최대 전환율은 96.3% (같은 조건에서의 VAc의 벌크중합의 경우에는 40% 이하)까지 얻을 수 있었다. 수평균 중합도 8000-15000의 PVAc가 얻어졌으며 전환율 50-95%로 제조된 PVAc의 아세틸기에 대한 가지화도는 1.5-3.5였다. 중합된 PVAc를 비누화함에 의해서 최고 수평균 중합도 4500의 PVA가 합성되었다. PVA의 교대배열다이애드기 함량은 51.5-52.5%의 거의 일정한 값을 보였으며 PVA의 수평균 중합도와는 무관하였다.

Keywords: suspension polymerization; PVAc; ADMVN; PVA

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  • Polymer(Korea) 폴리머
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This Article

  • 1996; 20(6): 1004-1013

    Published online Nov 25, 1996