Polymer(Korea), Vol.23, No.2, 247-254, March, 1999
폴리아스팔트산 및 그 하이드로겔의 제조와 물성
Preparation and Properties of Poly(aspartic acid)-based Hydrogel
초록
폴리아스팔트산의 전구체인 polysuccinimide는 인산을 촉매로 아스팔트산을 축중합하여 제조하였으며 L-아스팔산 : 인산의 비율이 1.00 : 0.75일 때 가장 높은 용액 점도를 갖는 polysuccinimide를 얻을 수 있었다. Sulfolane과 mesitylene을 용매로 하여 용액중합법으로 polysuccinimide를 합성한 결과 얻어진 반응물의 색상은 매우 깨끗하였으나 중합체의 점도는 bulk 중합 결과에 비해 낮았다. Dicyckigexycarbodiimide(DCC)를 사용한 polysuccinimide의 후중합 결과 polysuccinimide의 점도가 0.46에서 0.60 dL/g으로 증가하였다. Polysuccinimide를 물에 분산시켜 가교와 함께 가수분해시키는 방법과 DMF상에서 가교시킨 후 가교된 중합체를 가수분해시키는 방법에 의한 하이드로겔의 제조 결과, 전자의 방법이 약 3배의 높은 흡수능을 나타내었다. Hexamethylenediamine을 3 mol% 사용한 경우 104 g/g-polymer의 최대 흡수율을 보였다.
High molecular weight polysuccinimide(PSI), as a pecursor of poly(aspartic acid), was prepared by thermal polycondensation of L-aspartic acid. The molecular weight was high when phosphoric acid was used as a catalyst, and the ratio to monomer was 0.75 : 1(phosphoric acid : L-aspartic acid). Attepted solution polymerization in various sulfolane/mesitylene mixtures gave only low molecular weight polymers. By the post polymerization of PSI using DCC as a condesing reagent, the molecular weight of PSI could be increased to some extent. Hydrogels was prepared by crosslinking reaction of PSI with diamine, followed by hydrolysis with NaOH either in water or in DMF solution. As high as 104g water/g-polymer absorption could be obtained from the hydrogel prepared with 3 mol% of hexamethylenediamine.
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