Observation of collapse and swelling of thermosensitive poly(N-isopropylacrylamide) brashes grafted on SiO2

Chie Yahiro, Masahiko Annaka, Motoyasu Kobayashi, Atsushi Takahara, Akihiko Kikuchi, Teruo Okano

Research output: Contribution to conferencePaper

Abstract

Thermosensitve poly(N-isopropylacrylamide) (PNIPAM) brushes grafted onto SiO2-coated quartz crystal or glass surface were prepared with a surface-immobilized initiator. The microstructure of PNIPAM layer was examined by XPS, and AFM. Using QCM, we investigated the collapse and swelling of the brushes in water in real time. Frequency of PNIPAM brushes were found to gradually change throughout a temperature range 20-40°C, indicating that the PNIPAM brushes undergo a continuous transition. The nonuniformity and stretching of PNIPAM brushes as well as the cooperativity between collapse and dehydration transitions are thought to be responsible for the continuity.

Original languageEnglish
Number of pages1
Publication statusPublished - 18 Oct 2006
Event55th SPSJ Annual Meeting - Nagoya, Japan
Duration: 24 May 200626 May 2006

Conference

Conference55th SPSJ Annual Meeting
CountryJapan
CityNagoya
Period24/05/0626/05/06

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Keywords

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

Cite this

Yahiro, C., Annaka, M., Kobayashi, M., Takahara, A., Kikuchi, A., & Okano, T. (2006). Observation of collapse and swelling of thermosensitive poly(N-isopropylacrylamide) brashes grafted on SiO2. Paper presented at 55th SPSJ Annual Meeting, Nagoya, Japan.