采用自由基溶液聚合的方法,以过硫酸铵（APS）为引发剂,N,N′-亚甲基双丙烯酰胺（NNMBA）为交联剂,制备了聚丙烯酸（PAA）复合活性炭凝胶（PAA/AC）。考察了凝胶在生理盐水和不同pH值缓冲溶液中的平衡溶胀比及溶胀动力学,结果表明,活性炭能有效提高PAA凝胶的平衡溶胀比。蒸馏水中PAA/AC凝胶的平衡溶胀比可达到303（g/g）,约为PAA凝胶平衡溶胀比的2.3倍;生理盐水（0.9%g/mL NaCl水溶液）中PAA/AC凝胶的平衡溶胀比可达到60（g/g）,约为PAA凝胶平衡溶胀比的2.4倍;在实验设计的pH范围内PAA/AC凝胶的平衡溶胀比比PAA凝胶更高,具有更好的pH值敏感特性。
Polyacrylic acid hydrogels complex with activate carbon（PAA/AC） were prepared by free radical solution polymerization of acrylic acid（AA） using ammonium persulfate（APS） as an initiator and N,N′-methylene-bis acrylamide（NNMBA） as a crosslinker in the presence of activate carbon.The swelling behaviors of the hydrogels were studied in distilled water,normal saline solution and buffer solutions with different pH values.The results show that the PAA/AC hydrogel has a higher equilibrium degree of swelling（SWeq） than PAA hydrogel： the SWeq of PAA/AC is about 303（g/g） and 2.3 times more than that of PAA hydrogel in distilled water;it is about 60（g/g） and 2.4 times more than that of PAA hydrogel in normal saline solution;as well as an excellent pH-sensitivity over the range of pH investigated.
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