苯乙烯/黏土协同作用对瓜尔胶复合高吸水凝胶性能影响

Synergistic Effect of Styrene and Clay on the Properties of Guar Gum-Based Superabsorbent Hydrogel

在瓜尔胶-g-聚丙烯酸钠/无机黏土(GG-g-PNaA/Clay)体系中引入疏水单体苯乙烯(St)参与接枝共聚,水溶液聚合法合成了瓜尔胶-g-聚(丙烯酸钠-co-苯乙烯)/无机黏土(GG-g-P(NaA-co-St)/Clay)复合凝胶。用红外光谱、紫外光谱和扫描电镜对复合凝胶进行了表征,考察了St与无机黏土的协同作用对凝胶三维网络和溶胀性能的影响。实验结果表明,当黏土的质量分数为10%时,随着St的加入,凝胶平衡溶胀倍率(Qeq)呈现先增大后降低趋势;当St质量分数为1.5%时,凝胶Qeq达到最大值。St与凹凸棒黏土、海泡石和蛭石协同作用,不仅使复合凝胶表面形貌粗糙度增加,孔洞增多,而且也使Qeq分别提高了48.9%、50.3%和37.5%。此复合凝胶在0.9%NaCl溶液和一定pH溶液中的Qeq也明显提高,并且经过5次溶胀-去溶胀平衡后,均表现出良好的盐和pH响应性。

Guar gum-g-poly（sodium acrylic-co-styrene）/clay （GG-g-P（NaA-co-St）/clay） superabsorbent hydrogels were prepared by the simultaneous graft copolymerization of hydrophobic St and inorganic clay onto GG-g-PNaA system in aqueous solution. The structure and morphology of the synthesized superabsorbent hydrogels were characterized by FT-IR, UV-vis and FESEM. The synergistic effect of St and inorganic clay on the 3D network and swelling properties of GG-g-PNaA/clay hydrogels were investigated. The experimental results indicate that with the introducing of St, the equilibrium swelling ratio （Qeq） of the hydrogels increases firstly and then decreases （the mass fraction of the inorganic clay is 10%）. When the mass fraction of St is 1.5%, Qeq reaches the maximum valus. The synergistic effect of St and attapulgite （APT）, speiolite （ST）, vermiculite （VMT） not only improves the surface roughness of the hydrogels but also enhance Qeq by 48.9%, 50.3% and 37.5%, respectively. Moreover, the composite hydrogels show excellent swelling deswelling on off responsive behaviors in 0.9% NaCl solution and pH solutions after five recycle swelling, and can be used as promising candidates for drug delivery application.