Effect of the Position of Azobenzene Moiety on the Light-Driven Anisotropic Actuating Behavior of Polyvinylalcohol Polymer Blend Films

아조벤젠 분자의 사슬 내 위치에 따른 고분자 블렌드 박막의 비등방성 광 변형에 관한 연구

  • Kim, Hyong-Jun (Department of Chemical Engineering, Kongju National University)
  • 김형준 (공주대학교 화학공학부)
  • Published : 2012.02.10

Abstract

Structural changing materials which can induce the physical deformation of materials are interesting research topics with various potential applications. Particularly, light among many driving mechanisms is a non-contact energy source, hence the light-responsive system can be used where non-destructive, local irradiation, and remote control is needed. Here, a mainchain azobenzene polymer is synthesized and its physical and optical properties are observed and compared to that of a polymer having a light-responsive azobenzene moiety on its side chain. Further dispersion onto polyvinylalcohol hydrogel is made and its dual stability and actuation are observed upon UV-visible light irradiation. Extended azobenzene polymer blend films show an anisotropic light-actuation with non-polarized UV light at room temperature. This physical shape change is quite reversible and occurs at lower temperature than that of any other reported systems including liquid crystalline elastomers. It is successfully demonstrated that the simple physical azobenzene/polymer blending has a very good actuation compared to that of LCEs which need an elaborate chemical design and it can be further used in the areas requiring a dimensional shape change.

References

  1. A. Mazzoldi and D. DeRossi, Smart Structures and Materials 2000: Electroactive Polymer Actuators and Devices, eds. Y. Bar-Cohen, Newport Beach, USA (2000).
  2. Y. Bar-Cohen, Electroactive Polymer Actuators as Artificial Muscles-reality, Potential and Challenges, 2nd ed., SPIE Press, USA (2004).
  3. N. K. Viswanathan, D. Y. Kim, S. Bian, J. Williams, W. Liu, L. Li, L. Samuelson, J. Kumar, and S. K. Tripathy, J. Mat. Chem., 9, 1941 (1999). https://doi.org/10.1039/a902424g
  4. Y. Yu, M. Nakano, and T. Ikeda, Pure Appl. Chem., 76, 1467 (2004). https://doi.org/10.1351/pac200476071467
  5. H. Finkelmann and E. Nishikawa, Phys. Rev. Lett., 87, 015501 (2001). https://doi.org/10.1103/PhysRevLett.87.015501
  6. C. Barrett, A. Natansohn, and P. Rochon, Chem. Mater., 7, 899 (1995). https://doi.org/10.1021/cm00053a014
  7. A. Priimagi, S. Cattaneo, R. H. A. Ras, S. Valkama, O. Ikkala, and M. Kauranen, Chem. Mater., 17, 5798 (2005). https://doi.org/10.1021/cm051103p
  8. D. Horn and J. Rieger, Angew. Chem. Int. Ed., 40, 4330 (2001). https://doi.org/10.1002/1521-3773(20011203)40:23<4330::AID-ANIE4330>3.0.CO;2-W
  9. S. Kwolek, P. Morgan, and J. Schaefgen, Encyclopedia of Polymer Science and Engineering, John-Wiley, New York (1985).
  10. S. Yitzchaik and T. J. Marks, Acc. Chem. Res., 29, 197 (1996). https://doi.org/10.1021/ar9501582
  11. H.-J. Kim, K. Lee, S. Kumar, and J. Kim, Langmuir, 21, 8532 (2005). https://doi.org/10.1021/la0511182
  12. Y. Lvov, G. Decher, and H. Mohwald, Langmuir, 9, 481 (1999).