聚电解质复合物在表面活性剂水溶液中的溶解机理

聚电解质复合物 ( PEC)因其独特的物理化学性质而受到广泛关注 .对其研究主要集中在其结构及形成的影响因素 ,如聚电解质的分子量 1,2 ] 、电荷密度、电荷强弱 1,2 ] 及溶液离子强度 3,4 ] ,而很少有关于聚电解质复合物溶解性的报道 5,6 ] .一般认为组成 PEC的聚正离子 ( PC)和聚负离子 ( PA)之间 ,通过离子键形成网状交联结构而不溶于水及有机溶剂 .只有一种特殊的溶剂体系屏蔽溶剂可溶解此类复合物7,8] .本文报道一类新的聚电解质复合物 :以二苯胺重氮树脂 DR为聚正离子 ,苯乙烯 -马来酸酐碱性水解物 ( PSMNa)为聚负离子的 P…

The Dissolution Mechanism of Polyelectrolyte Complex in Surfactant Aqueous Solution

Polyelectrolyte complex formed from diazoresin(DR) as cationic polyelectrolyte and alkaline hydrolysate of styrenemaleic anhydride copolymer(PSMNa) as anionic polyelectrolyte does not dissolve in water or organic solvents due to its ionic crosslinking structure. It was found that the solubility of this complex was greatly enhanced in aqueous solution of sodium dodecyl sulfate(SDS). The solubility of DR-PSMNa complex in0.1 mol/Land 0.15 mol/L SDSaqueous solution was determined to be 0.024 g/mLand 0.033 g/mLrespectively. It was also confirmed that the complex from DR and SDS, which does not dissolve in water, can also dissolve in SDSaqueous solution. The decomposition temperature(T_d) of diazonium groups for different complexes was determined by DSCand shows that the T_dof DR-PSMNa after dissolution in SDSaqueous solution changes to 146 ℃ from the original value of 133 ℃. It was proposed that during the dissolution of PECin surfactant aqueous solution, the complex is separated to its two components via the interaction between PECand surfactant molecules at first, then the components dissolve in water.