Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Preparation of Monodisperse Poly(Acrylic acid) with a Water-Soluble Initiator by Solution Polymerization in Aqueous Phase

수용액 내에서 수용성개시제를 이용한 단분산성 폴리아크릴산의 용액중합

  • Park, Moonsoo (Department of Polymer Engineering, University of Suwon) ;
  • Kim, Yeji (Department of Polymer Engineering, University of Suwon)
  • 박문수 (수원대학교 공과대학 신소재공학과) ;
  • 김예지 (수원대학교 공과대학 신소재공학과)
  • Received : 2014.07.31
  • Accepted : 2014.08.12
  • Published : 2014.09.30
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Abstract

Solution polymerization was conducted with water-soluble acrylic acid (AA) as a monomer and potassium persulfate (KPS) as an initiator at a selected temperature between $60^{\circ}C$ and $90^{\circ}C$ with water as a reaction medium. When the ratio between AA and water was reduced or initiator concentration increased, molecular weights decreased. An increase in the reaction temperature produced lower molecular weights. The polydispersity index was close to 1.5 in most of the reactions. An increase in the stirring speed up to 400 rpm led to a progressive increase in molecular weights. When the stirring speed reached 800 rpm, however, we found that both the number and weight average molecular weights decreased. The glass transition temperature was nearly independent of moelcular weights and determined to be between $113^{\circ}C$ and $116^{\circ}C$.

수용성 단량체인 아크릴산 (AA)을 단량체로 potassium persulfate (KPS)를 개시제로 이용하여 $60^{\circ}C$에서 $90^{\circ}C$ 사이의 선택된 온도에서 물을 반응매체로 하여 용액중합을 진행하였다. 아크릴산의 농도가 감소하거나 개시제의 농도가 증가하면 분자량은 감소하였다. 중합반응온도를 상승하면 폴리아크릴산 (PAA)의 분자량은 감소하였다. 대부분의 중합반응에서 분산성지수는 1.5 에 근접하는 것으로 관찰되었다. 교반속도가 증가하면서 400 rpm에서 분자량은 최고값을 나타낸 후, 교반속도가 800 rpm에 이르면서 수평균 및 중량평균분자량은 감소하였다. 유리전이온도는 분자량에 따라 크게 변하지 않았으며 $113^{\circ}C$에서 $116^{\circ}C$ 사이의 값을 나타내었다.

Keywords

References

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