Non-Linear Characteristics of the Photoinduced Deformation in Azobenzene-Containing Monolayers at the Air-Water Interface

Abstract

Poly(vinyl alcohol)s having an azobenzene (Az) side chain (6Azn-PVA, n being the carbon number of the methylene spacer connecting PVA and Az unit) form a mechanically stable monomolecular film on a water surface. Alternate irradiation of UV (365 nm) and visible (436 nm) light induces large expansion and contraction of this monolayer in a reversible way. The photoinduced deformation of an isolated monolayer domain could be visualized using a Brewster angle microscope combined with a specially designed mobile mini trough. 6Azn-PVA with the longer spacers (n = 5 and 10) clearly exhibited a non-linear response in UV induced expansion with respect to the trans-to-cis photoisomerization proceeding with an induction time before starting expansion, whereas that of the shortest spacer (n = 1 ) did not show such a behavior. For 6Az10-PVA monolayer, intermittent UV light irradiation showed an forward (UV) and backward (dark) motion. The above non-linear deformation behavior can be the consequence of a cooperativity stemming from the self-assembling nature of the trans-Az side chains with the longer spacer.

References

  1. 1

    M. Irie, Adv. Polym. Sci., 94, 27 (1990). And references cited therein.

  2. 2

    T. Kinoshita, Prog. Polym. Sci., 20, 527 (1995). And references cited therein.

  3. 3

    H. S. Blair, H. I. Pogue, and J. E. Riordan, Polymer, 21, 1195 (1980).

  4. 4

    H. Gruder, R. Vilanove, and F. Rondelez, Phys. Rev. Lett., 44, 590 (1980).

  5. 5

    B. R. Malcolm and O. Pieroni, Biopolymers, 29, 1121 (1990).

  6. 6

    H. Menzel, Macromol. Chem. Phys., 195, 3747 (1994).

  7. 7

    M. Higuchi, M. Minoura, and T. Kinoshita, Colloid Polym. Sci., 273, 1022 (1995).

  8. 8

    T. Seki and T. Tamaki, Chem. Lett. 1993, 1739.

  9. 9

    T. Seki, R. Fukuda, M. Yokoi, T. Tamaki, and K. Ichimura, Bull. Chem. Soc. Jpn., 69, 2375 (1996).

  10. 10

    T. Seki, H. Sekizawa, R. Fukuda, T. Tamaki, M. Yokoi, and K. Ichimura, Polym. J., 28, 613 (1996).

  11. 11

    T. Seki, H. Sekizawa, and K. Ichimura, Polym. Commun., 38, 725 (1997).

  12. 12

    T. Seki, H. Sekizawa, S. Morino, and K. Ichimura, J. Phys. Chem. B., 102, 5313 (1998).

  13. 13

    T. Seki, K. Tanaka, and K, Ichimura, Macromolecules, 30, 6401 (1997).

  14. 14

    T. Seki, H. Sekizawa, K. Tanaka, Y. Matsuzawa, and K. Ichimura, Supramol. Sci., 5, 373 (1998).

  15. 15

    D. J. Bullock, C. W. N. Cumper, and A. I. Vogel, J. Chem. Soc., 1965, 5316.

  16. 16

    K. Kago, M. Feurst, H. Matsuoka, H. Yamaoka, and T. Seki, Langmuir, 15, 2237 (1999).

  17. 17

    T. Seki, M. Sakuragi, Y. Kawanishi, Y. Suzuki, T. Tamaki, R. Fukuda, and K. Ichimura, Langmuir, 9, 211 (1993).

Download references

Author information

Affiliations

Authors

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Seki, T., Sekizawa, H. & Ichimura, K. Non-Linear Characteristics of the Photoinduced Deformation in Azobenzene-Containing Monolayers at the Air-Water Interface. Polym J 31, 1079–1082 (1999). https://doi.org/10.1295/polymj.31.1079

Download citation

Keywords

  • Azobenzene
  • Photoisomerization
  • Monomolecular Films
  • Photomechanical Effects
  • Non-linear Response

Further reading