疏水化聚N-异丙基丙烯酰胺胶束的极性

利用Kamlet-Taft溶致变色比较法，在确定了二种探针化合物的峰值波数与溶剂的溶致变色参数表达式的基础上，研究了一系列不同疏水化修饰的聚N-异丙基丙烯酰胶类共聚物水溶液胶束的极性肝（π）和氢键供体能力（α）．结果发现，在摩尔投料比相同时，随着共聚物中丙烯酸酯烷基链的增长，共聚物水溶液胶束的π越来越小，α越来越大；在共聚物组成相同时，随着丙烯酸酯投料比的增大，共聚物水溶液波束的π也呈现相同的情况，而α则无明显的规律．对此现象作了讨论．

A Study on the Micellar Polarity of Hydrophobic Poly(N-isopropylacrylamides)

The parameters of solvent polarity (π) and hydrogen bond donor ability(α) of a series of different hydrophobically modified poly (N-isopropylacrylamides)(PNIPAM ) micelles have been studied using the Kamlet-Taft solvatochrom comparson method,on the basis of the determination of the relationship between two probe s maximum wavenumber in fluorescence spectrum and solviatochromic parameters of different solvents. Results show that, at the same molar feed ratio ,the micellar environments of solubilized probe molecules become more nonpolar and have much stronger hydrogen bond donating ability with the increase of the alkyl length of acrylic ester in the copolymers. While for copolymer of N-isopropylacrylamides and octadecyl acrylate (NIPAM-C18).on increasing the molar feed ratio of ODA, the polarity of the micellar environments have the same rule as the above, however, their have no obvious rule. A preliminary discussion about these phenomena has been given.