Studies of Thermoresponsive Polymer Brushes by Atomic Force Microscopy and Quartz Crystal Microbalance with Dissipation

Abstract

Poly(N-isopropylacrylamide) (PNIPAAm) brushes were prepared on silicon/gold surfaces using
surface-initiated atom transfer radical polymerization of NIPAAm. AFM studies showed that the chain
growth dynamics of PNIPAAm could be well controlled by the polymerization time. At room temperature, a
PNIPAAm film with a thickness of 33 nm dried at room temperature increased its thickness to 82.4 nm in
water as a result of extension of the PNIPAAm chains. On the contrary, the PNIPAAm chains collapsed in
1∶1 (V∶V) water/MeOH solution, leading to a film thickness of 45 nm. When the film was dried at 55 ℃,
a more severe chain collapse occurred, resulting in a thin thickness of 22 nm. Moreover, the adhesion force
between the PNIPAAm chains and AFM tip in solution was far smaller than that in air, demonstrating that
the adhesion force at the collapsed state is larger than that at the extended state. The results of quartz crystal
microbalance showed further that the PNIPAM brushes exhibited a continuous collapse over a temperature
range of 24～42 ℃.

Key words: atom transfer radical polymerization, poly(N-isopropylacrylamide), atom force microscopy,
quartz crystal microbalance

Cite this article

LI Lin-Hui, TUN Jin-Dan, WANG Hong-Xia, GAO Chang-Wei. Studies of Thermoresponsive Polymer Brushes by Atomic Force Microscopy and Quartz Crystal Microbalance with Dissipation[J]. Acta Chimica Sinica, 2009, 67(24): 2867-2874.

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