Real-time observation of coil-to-globule transition in thermosensitive poly(N-isopropylacrylamide) brushes by quartz crystal microbalance

Masahiko Annaka, Chie Yahiro, Kenichi Nagase, Akihiko Kikuchi, Teruo Okano

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Thermosensitive poly(N-isopropylacrylamide) (PNIPAm) brushes grafted on SiO2-coated quartz crystal surface were prepared by the surface initiated radical polymerization. Using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM), about 50 nm thickness of PNIPAm brushes were successfully formed. Quartz crystal microbalance with dissipation (QCM-D) is employed to investigate the collapse and swelling behavior of the PNIPAm brushes in water in real time. Both frequency and dissipation of PNIPAm layer were found to change gradually over the temperature range 15-50 °C, indicating that the brushes undergo a continuous transition. This continuous change is attributed to the nonuniformity and stretching of PNIPAm brushes as well as the cooperativity between collapse and dehydration transition.

Original languageEnglish
Pages (from-to)5713-5720
Number of pages8
JournalPolymer
Volume48
Issue number19
DOIs
Publication statusPublished - 2007 Sep 10
Externally publishedYes

Fingerprint

Quartz crystal microbalances
Brushes
Quartz
Free radical polymerization
Dehydration
Stretching
Swelling
Atomic force microscopy
X ray photoelectron spectroscopy
poly-N-isopropylacrylamide
Crystals
Water
Temperature

Keywords

  • Coil-to-globule transition
  • Poly(N-isopropylacrylamide)
  • Polymer brush

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Real-time observation of coil-to-globule transition in thermosensitive poly(N-isopropylacrylamide) brushes by quartz crystal microbalance. / Annaka, Masahiko; Yahiro, Chie; Nagase, Kenichi; Kikuchi, Akihiko; Okano, Teruo.

In: Polymer, Vol. 48, No. 19, 10.09.2007, p. 5713-5720.

Research output: Contribution to journalArticle

Annaka, Masahiko ; Yahiro, Chie ; Nagase, Kenichi ; Kikuchi, Akihiko ; Okano, Teruo. / Real-time observation of coil-to-globule transition in thermosensitive poly(N-isopropylacrylamide) brushes by quartz crystal microbalance. In: Polymer. 2007 ; Vol. 48, No. 19. pp. 5713-5720.
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