端羧基芳脂型超支化聚酯自组装性能的研究

利用聚电解质逐层浸渍 ( layer- by- layer dipping)法制备自组装膜是最近发展起来的进行表面改性的新方法1～ 3] .一方面 ,从理论上来说 ,只要是带电荷的聚合物都可以利用该技术制备具有优异性能的自组装膜 ;另一方面 ,还可以通过调节溶液的 p H值和离子强度等控制阴阳离子的组装过程 ,从而控制自组装膜的内部结构和表面形态 ,为在纳米级范围内设计和控制聚合物聚集态内部结构提供了可能性 .近年来 ,具有高度支化结构的超支化分子由于具有独特的物理和化学性能而受到了广泛的关注 4 ,5] ,但以聚电解质逐层浸渍法制备超支化分子自组装膜…

Studies on the Self-assembly of Aliphatic-aromatic Hyperbranched Polyester with Carboxylic End-groups

Carboxylic ended aliphatic aromatic hyperbranched poly(5 hydroxyethoxyisophthalic acid)(PHEIA) was employed for an electrostatic layer by layer self assembly procedure. The self assembly films have been successfully formed from both aqueous solution and water THF mixture. The self assembly procedure was monitored by UV Vis spectroscopy and contact angle measurement meter. The obtained multilayers were characterized by AFM for the surface morphology investigation. The results indicate that PHEIA is able to form self assembly film in the presence of poly(diallyldimethylammonium chloride) (PDAC). On the self assembled surface where PHEIA acted as an outmost layer, the PHEIA aggregated into sphere like particles with uniform diameter. Furthermore, the layer by layer self assembly procedure provided a favorable method for modification of the hydrophilicity of the substrate without heavy interpenetration between these two polyelectrolyte layers.