Polyacrylamide(PAAm)/clay nanocomposite (NC) hydrogel is a novel hydrogel crosslinked by nanoclay. An investigation is carried out on the influence of varying clay contents (25-43%), pH values (2-11 buffer solutions), heat treatment, temperatures (25-60℃) and ionic strengths (saline solution, 10-7-0.1M) on the its water absorbency in the absence of polyelectrolyte. For the influence of pH value on swelling behaviors, a maximum swelling ratio occurs at pH 11. Heat treatment of the hydrogels significantly improved the swelling capacity and created an obvious pH sensitive area (pH3~4).The crystal violet (CV) dye adsorption properties of the PAAm/clay NC hydrogels were investigated. A sigmoidal type of adsorption isotherm was observed for the CV-NC hydrogels. The swelling mechanism and water soluble cationic dye (Basic Blue 12, Basic Blue 9 and Basic Violet 1) adsorption behaviors of the hydrogels were also investigated. By comparing the dye removal behavior of the three kinds of cationic dyes, it demonstrates that the rates of dye uptake by the NC hydrogels have a close relation with the swelling results of the hydrogel in the dye solutions. The cationic dye removal efficiency of polyacrylamide/caly nanocomposite hydrogel is very high (>95%). A novel composite hydrogel was prepared successfully using an ionic monomer and acid-treated clay (Laponite XLS), which was also used as a cross-linking agent. The FT-IR spectra and rheological results of the composite hydrogels demonstrated the formation of a network. These composite hydrogels showed a much higher equilibrium swelling ratio and mechanical strength than the conventional organic cross-linked hydrogel. The improvement in both the equilibrium swelling ratio and mechanical strength was attributed mainly to its homogeneous cross-linked network structure. Poly(acrylate-acryloyloxyethyl trimethyl ammonium chloride)/clay nanocompoiste hydrogel shows excellent mechanical strength and electroresponsive behavior. The nancocomposite hdyrogel bent toward cathode side at first and then toward the anode side. With increasing of NaCl concentration, the electroresponsive rate of NC hydrogel decreases. While increasing the electric voltage can increase the electricresponsive rate. The increase of clay content of NC hydrogel has opposite effects on its electroresponsive property .
Polyacrylamide/clay nanocomposite hydrogels (PAAm/clay NC gels)는 나노클레이crosslink된 하이드르젤입니다. 본 논문은 클레이의 함량, PH값, 열처리, 온도 그리고 이온강도 등 으로 인해 미치는 흡수성의 영향에 대하여 연구하였습니다. 다른 PF용액에 비하여, PH값이 11일때 흡수률이 가장 높았습니다. 이는 열처리로 인해 흡수율이 개선되었고, PH에 민감하게 반응하는 영역이 생겨났음을 알수 있었습니다.(ph3~4)논문은 PAAm/clay NC hydrogels가 안료 Crystal violet (CV)의 흡착성능에 연구하여 흡착등온선S-type로 나왔습니다. 그리고 hydrogel이 기타 몇가지 안료에 swelling 및 adsorption성능도 연구하였습니다. 연구결과에 따지면 안료吸附능력은 hydroel이 안료에서의 흡수성과 관련됨을 알수 있습니다.이 안료 용액중에서 PAAm/clay NC hydrogel의 제거효율은 다 95%이상입니다.저희는 또 신형의 composite hydrogel를 제조하였습니다. ionic monomer와 acid으로 처리된 clay를 제조하여 acid으로 처리된clay는 crosslinking agent로 쓰입니다. FTIR spectra 와 (rheological으로 테스트하여 이 composite는 network가 형성되어 있음을 나타냈습니다. 이러한 재료는 유기交联의 hydrogel(organic crosslinked hydrogel)비하여, 보다 높은 흡수율과 기계성을 보여주었습니다.Poly(acrylate-acryloyloxyethyl trimethyl ammonium chloride)/clay nanocompoiste hydrogel는 우수한 기계성능과 electroresponsive behavior성능을 가지고 있습니다.이런 hydrogel는 전기장에서 ,우선 음극으로 구불어지고 다시 양극으로 구불어 집니다. NaCl용액의 농도 향상에 따라서 electroresponsive rate은 감소하게 됩니다. 전압을 증가시킴에 따라 electroresponsive rate는 증가 할수 있습니다. 클레이의 함량을 증가시키면 electroresponsive의 성능에대한 두가지의 반대적인 영향을 확인할 수가 있습니다.