采用对苯二胺改性纳米凹土并与聚丙烯酸在室温下直接复合制备复合水凝胶.研究改性温度、改性时间、对苯二胺与纳米凹土的质量比、改性纳米凹土及聚丙烯酸的用量等对水凝胶凝胶时间的影响,采用傅立叶红外光谱、扫描电镜和流变测试等技术对复合水凝胶进行表征和流变性能测试.实验结果表明,对苯二胺改性纳米凹土可使纳米凹土的分散性提高,改性纳米凹土/聚丙烯酸复合水凝胶具有较短的凝胶时间.流变学测试表明,改性纳米凹土的质量浓度在3.0％～7.0％(w/V,)的范围内,复合水凝胶的黏度、刚性和机械强度皆随改性纳米凹土质量浓度的增加而增加;当聚丙烯酸的质量浓度在1.0％～2.0％的范围内,复合水凝胶的黏度、刚性和机械强度皆随聚丙烯酸的质量浓度增加而增加,而当聚丙烯酸的质量浓度在2.0％～3.0％的范围内,复合水凝胶的黏度、刚性和机械强度皆随聚丙烯酸质量浓度的增加而降低.%The composite hydrogel of p-phenylenediamine modified nano-attapulgite/polyacrylic acid was fabricated with direct composition at room temperature. The influences of modification temperature and time, mass ratio of p-phenylenediamine to nanosized attapulgite, and amount of modified nano-attapulgite and polyacrylic acid on gelation time was investigated, and the composite hydrogel was characterized with techniques such as Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and rheological measurements. Experimental result showed that the dispersion of nano-attapulgite could be improved by means of its through modification with p-phenylenediamine, and the composite hydrogel of p-phenylenediamine modified nano-attapulgite/polyacrylic acid would have less gelation time. Rheological test showed that the viscosity, rigidity and mechanical strength of the composite hydrogel would increase with the mass concentration of modified nano-attapulgite in the range of 3. 0%~7. 0%. As for the influence of mass concentration of polyacrylic acid, the viscosity, rigidity and mechanical strength of the composite hydrogel would increase with mass concentration of polyacrylic acid in the range of 1. 0%~2. 0%, but decrease gradually in the range of 2. 0%~3. 0%.
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