Swelling degree and shape change of photo- and thermo-response of spirobenzopyran-functionalized porous pNIPAAm hydrogels

Genoveva Filipcsei, Kimio Sumaru, Toshiyuki Takagi, Toshiyuki Kanamori, Miklós Zrinyi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Novel hydrogels that shrink in response to light irradiation and temperature change have been developed. Since any technical application of polymer gels critically depends on the response rate, therefore porous hydrogels have been prepared in order to accelerate the response reaction. Poly(N-isopropylacrylamide) gels were functionalized with photo-responsive spirobenzopyran and solvent/nonsolvent mixtures were used as swelling agent to introduce network heterogeneities during the gelation process. Both photo- and thermo-responsive properties of gels have been investigated and compared. The time dependence of bending deformation due to the asymmetric light irradiation as well as kinetics of shrinking has been measured. It was found that the fastest photo- and thermo-responsive shrinking was observed for loosely crosslinked porous hydrogels. Furthermore, it was confirmed that the highly cross-linked cylindrical gel rod with macroporous structure showed rapid bending deformation due to the asymmetric light irradiation.

Original languageEnglish
Pages (from-to)63-67
Number of pages5
JournalJournal of Molecular Liquids
Volume189
DOIs
Publication statusPublished - Jan 1 2014

Keywords

  • Photo-induced bending
  • Photo-responsive hydrogel
  • Thermo-responsive hydrogel

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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