在N,N-二甲基甲酰胺/水混合溶剂中制备偶氮聚电解质自组装膜

利用静电吸附逐层自组装方法在有机溶剂N,N二甲基甲酰胺(DMF)和H2O的混合介质中制备非水溶性偶氮聚电解质自组装多层膜.研究了DMF和H2O的配比对自组装膜生长、结构与表面形态的影响.结果表明,DMFH2O的混合溶剂是非水溶性偶氮聚电解质自组装的理想介质,二者之间的配比对自组装膜的生长速度,膜的结构以及表面形态均有显著影响.随着混合溶液中DMF含量的升高,自组装膜的生长速度逐渐下降但线形生长关系越来越好,所得自组装膜中偶氮生色团的H聚集程度逐渐下降,而且自组装膜的表面越来越平整.

BUILDING-UP OF AZO POLYELECTROLYTE SELF-ASSEMBLED MULTILAYERS IN N, N-DIMETHYL FORMAMIDE/H2O MIXTURES

Building up the azo polyelectrolyte(PEAPH)/PDAC self-assembled multilayers was explored in N,N-dimethyl formamide(DMF)/H_2O mixtures using the layer-by-layer electrostatic adsorption technique.The focus of studies was concentrated on the effect of the ratios of DMF to water in the mixtures on the growth,structure and surface morphology of the PEAPH/PDAC multilayers.Results show that DMF/H_2O mixtures are ideal media for PEAPH/PDAC multilayer growth.The ratio of DMF to water in the mixture has significant influence on the multilayer structure and surface morphology.With the increase of DMF content the multilayer thickness has better linear growth relationship with multilayer number and the multilayer surface becomes smoother.As well,less azo chromophores exist in the H-aggregate style for multilayers fabricated from the DMF/H_2O mixture with more DMF content.These studies demonstrate that it is an effective method to control the multilayer construction by adjusting the medium properties and this method is useful for multilayer fabrication of water insoluble polyelectrolytes.