聚N-异丙基丙烯酰胺在十二烷基硫酸钠水溶液中的线团-球体转变

Coil-to-globule Transition of Poly (N-isopropylacrylamide) in the Sodium n-Dodecyl Sulfate Aqueous Solution

高分子链在溶液中,当溶剂由良变劣时,将发生线团-球体转变,而同时由于链间聚集造成的相分离,使得很难真正观察到热力学意义上稳定的高分子单链紧缩球体。表面活性剂的加入有助于阻止高分子链间发生聚集,在不同的外部条件下,表面活性剂同高分子链将形成形态迥异且又复杂有趣的复合结构。本文主要讨论了聚N-异丙基丙烯酰胺在十二烷基硫酸钠水溶液体系中的线团-球体转变行为,以及聚N-异丙基丙烯酰胺与十二烷基硫酸钠分子间的相互作用及结构模型。

Coil-to-globule transition of polymers has taken place in solutions when the quality of the solvents turns from good to bad. However, the phase separation of the solutions due to the interchain aggregation makes it very difficult to observe well the thermodynamic stable compact single-chain globules in solution. In the present of surfactant, the phase separation could be delayed for the intriguing formation of polymer-surfactant complexes. In this paper,the behaviors of the coil-to-globule transition of Poly （N-isopropylacrylamide）（ PNIPAM ） in the sodium ndodecyl sulfate（SDS） aqueous solution have been reviewed, and the available structure models of the PNIPAM-SDS complexes have been also discussed.