阳离子纤维素与十二烷基苯磺酸钠的相互作用

Interaction Between Cationic Cellulose and Sodium Dodecyl Benzene Sulfonate

通过浊度、电导率、荧光和流变研究了阳离子纤维素（PQ-10）与阴离子表面活性剂。卜=烷基苯磺酸钠（SDBS）的相互作用。结果表明在等电点附近产生沉淀，且沉淀区域随PQ-10浓度增大而变宽。在整个浓度区域内，PQ-10存在时SDBS的电导率要高于纯SDBS的电导率。SDBS的聚集数在相应的微极性曲线平台区（0．86～1．43mM）内保持不变。并由稳态流变检测了复合物结构变化，随SDBS浓度增大，复合物结构由蠕虫状的枝化结构转变为相互连接的网络结构，最后网络结构坍塌。

The interactions between cationic cellulose （PQ-10） and anionic surfactant （SDBS） were investigated by turbidity, conductivity, steady fluorescence and steady theology analyses. Results indicated that precipitation appeared near the charge neutrality point, and the size of precipitation region widened with increasing PQ-10 concentration. The specific conductivity values of SDBS in the presence of PQ-10 were higher than that of pure SDBS over the whole concentration range under current experimental conditions. The aggregation number of SDBS kept constant in the flat region of the micropolarity curve （0.86- 1.43 mM）. The structural transformation of the mixtures was monitored by rheology. As SDBS concentration increased, the morphologies of the mixtures changed gradually from branched wormlike aggregates to interconnected networks, finally the networks collapsed.