• Preparation and Swelling Behavior of Acrylate Hydrogels with Amphiphilic Groups Depending on pH
  • Lee YT, Lee SK, Jeong DS
  • Amphiphilic Acrylate 수화겔의 제조와 pH 변화에 따른 팽윤거동
  • 이용택, 이성길, 정두식
Abstract
Hydrogels of crosslinked polyacrylates containing various amounts of hydrophilic(COO-) and hydrophobic (CH2) groups were prepared. The degree oi crosslinking was controlled by the amount of crosslinking agent used. The effect of crosslinking densify and pH on the volume changes of hydrogels were investigated. As the concentration of crosslinking agent was increased, Mw between crosslink points decreased and absorption capability also decreased due to increasing elasticity which suppressed gel swelling. These caused the reduction of swelling ratio. Osmotic pressure was dependent on the interaction between hydrophilic and hydrophobic groups and the degree of ionization of side chains. Change of osmotic pressure caused the change of swelling ratio.

곁사슬에 서로 다른 양의 친수성기(COO-)와 소수성기(CH2)를 가지는 고분자들을 여러 가지 가교도를 가지도록 acrylate 수화겔을 합성하고, 이들 수화겔에 대하여 여러 가지 pH 범위에서 팽윤될 때 그 부피 변화를 관찰하여 가교제 농도변화의 영향과 pH 의존성에 대하여 조사하였다. 가교제 농도가 증가할수록 가교점간의 분자량이 감소하며 겔의 팽윤을 억제하는 고무 탄성력이 상대적으로 커져 흡수력이 떨어지게 되어 팽윤비가 감소함을 알 수 있었다. 또한 각 pH 영역에서 곁사슬의 이온화도의 증·감의 변화와 친수성기와 소수성기간의 상호작용으로 인한 삼투압의 변화에 의해 다양한 팽윤비 변화를 알 수 있었다.

Keywords: acrylate hydrogel; amphiphilic; pH; swelling behavior; ionization degree

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This Article

  • 1998; 22(5): 741-748

    Published online Sep 25, 1998