A composite flocculants polyaluminum chloride (PAC) - polydimethyldiallyammonium chloride (PDMDAAC) were prepared by using PAC and PDMDAAC as raw materials. And the framework characteristic of PDMDAAC was studied by TEM. The effect of dilutedness and aging on the framework characteristic of the composite flocculant was also investigated. The experimental results show that the framework characteristic of PAC-PDMDAAC is different from that of PAC, due to the interaction of PDMDAAC and PAC. The interaction of ...