Study of the kinetics of the pancake-to-brush transition of poly(N-isopropylacrylamide) chains

作者：Liu GM; Cheng H; Yan LF; Zhang GZ

来源：Journal of Physical Chemistry B, 2005, 109(47): 22603-22607.

DOI：10.1021/jp0538417

The chemical grafting of thiol-terminated poly(N-isopropylacrylamide) (HS-PNIPAM) chains to a gold surface from a solution was investigated with a quartz crystal microbalance (QCM) in real time. The frequency and energy dissipation responses revealed that short HS-PNIPAM chains exhibit three-regime kinetics of the grafting. In regimes I and II, the HS-PNIPAM chains form pancake and mushroom structures, respectively. In regime III, the chains form brushes. From regime II to regime III, the mushroom-to-brush transition occurs. For the longer HS-PNIPAM chains, because of the strong segment-surface interaction, the segments cannot desorb from the surface, and the chains do not undergo a pancake-to-brush transition.

• 出版日期2005-12-1
• 单位中国科学技术大学