利用荧光各向异性、荧光探针和荧光猝灭等静态光物理技术研究了稀水溶液中聚甲基丙烯酸(PMAA)与阳离子修饰聚丙烯酰胺 (QCPAM )间的络合作用.结果表明 :在 pH=2 -8范围内 ,PMAA与QCPAM之间发生明显络合 ,但以 pH为4时络合作用最大 ,最佳络合配比为1:1(单体单元比 ) ,络合作用的发生大大地改变了PMAA的构象行为.PMAA构象对 pH和络合作用的双重依赖性有可能在新型“智能”凝胶的设计合成上获得应用. The complexation between poly (methacrylic acid) (PMAA) and cationic modified polyacrylamide (QCPAM) in dilute aqueous solution was studied by means of fluorescence anisotropy, fluorescence probe and fluorescence quenching. The results showed that at pH = 2 -8, the complexation between PMAA and QCPAM was obvious, but the complexation was the largest at pH 4 with the best complex ratio being 1: 1 (monomer unit ratio), the complexation occurred Greatly changed the conformational behavior of PMAA.The dual dependence of PMAA conformation on pH and complexation may be applied in the design and synthesis of novel “smart” gels.