Swelling behavior of chitosan/poly(acrylic acid) complex

Authors

  • Thi Thi Nge,

    1. Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1–1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
    Search for more papers by this author
  • Naruhito Hori,

    1. Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1–1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
    Search for more papers by this author
  • Akio Takemura,

    Corresponding author
    1. Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1–1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
    • Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1–1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
    Search for more papers by this author
  • Hirokuni Ono

    1. Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1–1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
    Search for more papers by this author

Abstract

This study investigates the improved swelling behavior of chitosan/poly(acrylic acid) complex by solvent (methanol, ethanol, and acetone) extraction. The complex is developed by photoinitiated free-radical polymerization of acrylic acid in the presence of chitosan. The swelling ratio of the complexes depends on the cosolvency effect of poly(acrylic acid) to the extracted solvent, which in turn affects the polymer network structure and ionic states characterized by dynamic force microscopy (DFM), Raman, and FT-IR spectroscopy. The DFM investigation displays the improved structural changes of the polymer network structure after solvent extraction and its relation to the improved swelling property of the chosen system in different environmental conditions (pH, solvent, and salt concentration) are discussed. A high swelling ratio of about 600 times its dry weight is observed in water as well as in low salt and solvent concentration after methanol extraction. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2930–2940, 2004

Ancillary