侧链型偶氮聚电解质自组装和膜结构研究

研究了4种侧链型偶氮聚电解质的自组装过程及其对自组装膜结构的影响.用聚电解质上的偶氮基团作为“探针”,研究了自组装过程中出现的生色团取向、解吸附和非线性增长等现象.这些侧链型偶氮聚电解质均具有较好的自组装性,但其自组装行为有很大差异.在不同的pH条件下,聚电解质的电离程度不同,导致吸附过程和自组装膜结构亦明显不同.自组装膜的增长和结构取决于体系中吸附和解吸的平衡.偶氮生色团端基的亲水或疏水性对自组装膜的增长有明显的影响.偶氮聚电解质自组装过程不同阶段出现的非线性增长现象,分别反映了基底、溶液性质和聚电解质结构等因素的影响.

Studies on Growth and Architecture of Self-assembled Multilayers Fabricated from Side Chain Azo Polyelectrolytes

Growth and architecture of self assembled multilayers, which were fabricated from four side chain azo polyelectrolytes by a layer by layer adsorption technique, have been studied. The azo chromophore in side chain was employed as a "probe" to investigate chromophore orientation, desorption and nonlinear growth in the multilayer growth process. All azo polyelectrolytes showed a good self assembling ability, but the multilayer growth processes were different from one to another. Different pH valuse resulted in the difference in multilayer growth and architecture, due to this effect on the ionization degree of the polyelectrolytes. The multilayer growth and architecture depend on the adsorption and desorption equilibrium in the systems. The end groups tethered to the azo chromophores, hydrophilic or hydrophobic, showed a significant influence on the multilayer growth. Nonlinear growth appeared at different stages of multilayer formation were found to be related to the substrates, solution properties and polyelectrolyte structures.