中文摘要：

通过两步聚合得到既具有良好力学强度又具有优良导电性能的聚丙烯酰胺-g-聚苯胺复合水凝胶．首先，丙烯酰胺和N-（4-氨苯基）丙烯酰胺在钴源y-射线辐照下共聚形成聚丙烯酰胺水凝胶；然后，苯胺在具有微观多孔结构的聚丙烯酰胺凝胶中吸附，在过硫酸铵的作用下与凝胶的苯胺侧基发生接枝聚合，得到聚丙烯酰胺-g-聚苯胺水凝胶，并形成聚苯胺连续导电通道．改变辐照时间和辐照剂量率，所获得的聚丙烯酰胺水凝胶的凝胶分数随着辐照剂量的增加逐渐增大，而溶胀率随着辐照剂量的增加呈先增后减的趋势，表明凝胶的交联程度随辐照剂量呈规律性变化；辐照交联聚合的单体浓度对凝胶的性能，如溶胀率、微观结构和机械性能等也有影响．酸掺杂后，聚丙烯酰胺-g-聚苯胺复合凝胶的电导率达到9S／m．

英文摘要：

Composite hydrogels of polyacrylamide-graft-polyaniline possessing both good mechanical strength and excellent electrical conductivity were prepared through a two-step polymerization route. Firstly, acrylamide （Am） and N-（4-aminophenyl） acrylamide （APAm） were radically copolymerized through Co60 T-irradiated initiation in aqueous solution to form P （Am-co-APAm） hydrogels, of which the aminophenyl side groups facilitated the following graft polymerization of aniline. Secondly, after the lyophilized P （Am-co-APAm） hydrogels were re-swelled in aniline aqueous solution, aniline absorbed in the macroporous hydrogels underwent the oxidation coupling graft polymerization with aminophenyl side groups of P （Am-co-APAm） to result in P（Am-co-APAm）-g-PANI composite hydrogels. As expected, the produced polyaniline was naturally deposited onto the pore wall of P （Am-co-APAm） hydrogels, leading to the formation of inter-connected conductive pathway. Fourier transfer infrared spectroscopy, combined with the repeated removal of possible homopolyaniline with N-methylpyrilidone, confirmed the successful grafting. To modulating the mechanical properties, the influences of radical polymerization parameters were investigated. By changing radiation duration and dose rate, it was found that the gel fraction （GF） of P （Am-co-APAm） hydrogels increased with the increment of irradiation dose, while swelling degree （SD） had the maximum value under medium irradiation dose,reflecting that both monomer conversion and crosslinking degree affected the GF and SD of P （Am-co- APAm） hydrogels. With the increase in monomer concentration,GF was kept going up and levelled off at 1.5 co while SD kept going down and levelled off at the same monomer concentration. The tensile strength and elongation at break of P （Am-co-APAm） hydrogels decreased, but elastic modulus increased, reflecting the cooperative impact of erosslinking degree and polymer produced. Interestingly, as observed by scanning electron mi