화학공학소재연구정보센터
Polymer(Korea), Vol.40, No.5, 759-768, September, 2016
냉동 젤화 및 금속 배위에 의한 기계적 물성이 향상된 이중가교 폴리아스팔트산 하이드로젤의 제조
Dual-Crosslinked Mechanically Strong Hydrogel Based on Poly(aspartic acid) via Cryogelation and Metal-Coordination
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초록
Double network(DN) 하이드로젤, nanocomposite 및 nanostructured 하이드로젤을 포함한 새로운 여러가지 방법으로 높은 강도(strength)와 인성(toughness)을 갖는 하이드로젤을 제조하기 위한 노력이 계속되고 있다. 본 연구에 서는 초다공성 poly(aspartic acid)(PASP) cryogel을 전구체 폴리머인 polysuccinimide의 DMSO 용매상에서 -25 ℃의 저온 가교반응(cryogelation)과 이 생성된 젤의 pH9 버퍼용액 내 가수분해 공정을 통해 제조하였다. 얻은 하이드로 젤은 다음 단계에서 금속 양이온(ex. Fe+3, Ca+2, Zn+2)을 함유한 수용액으로 처리함으로써 공유결합과 함께 카복실산 과 금속 양이온간의 이온 결합을 포함하는 이중가교(dual-crosslinked) 하이드로젤로 전환된다. 결과의 PASP cryogel은 금속 양이온의 종류에 따라 향상된 기계적 강도와 인성을 나타내었다. 압축 및 인장시험을 통해 1) 상온에서 제조한 일반 PASP 하이드로젤, 2) PASP-cryogel, 그리고 3) 금속이온 함유 PASP-cryogel의 기계적 특성을 비교 고찰하였다. 그리고 FTIR과 SEM을 통하여 분자구조 및 젤의 다공성 모폴로지를 확인하였다.
Many efforts have been made to develop highly strong and tough hydrogels by new approaches including double network (DN) hydrogel, nanocomposite hydrogel, nanostructured hydrogel, etc. In this study, macroporous monolithe gel based on chemically crosslinked poly(aspartic acid) (PASP) was prepared via cryogelation in DMSO and the following hydrolysis reaction under pH9 buffer. The resulting water-swollen gel was treated in next step with metal cation (Fe+3, Ca+2 or Zn+2) in aqueous solution to provide gel possessing ionic-crosslink between carboxylic acid and metal ions in addition to covalent network. The final dual-crosslinked PASP cryogel exhibited highly improved gel strength & toughness varying on the different metal species. The mechanical properties were investigated by both compression and tensile test to compare different cryogels with conventional PASP hydrogel. FTIR and SEM were used to elucidate the chemical structure and macroporous morphology of gel.
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