An analysis of anisotropic gel forming process of chitosan

Toshiaki Dobashi, Naoko Tomita, Yasuyuki Maki, Chih Pong Chang, Takao Yamamoto

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


We have prepared anisotropic chitosan gels with birefringence by immersing a sandwiched chitosan in aqueous acetic acid into aqueous sodium hydroxide. The gel forming process was traced under observation with crossed nicols and open nicols with and without litmus agent. The time courses of the gel front, the birefringent layer and the pH-change layer agreed with each other fairly well. The early stage of the dynamics was expressed by a theory with an assumption of an OH- diffusion-limited process, whereas the behavior in the late stage deviated from the theoretical one. The deviation results from the effect of the outflow of protons, and the crossover of the two behaviors is attributed to the relaxation to the thermal equilibrium.

Original languageEnglish
Pages (from-to)709-712
Number of pages4
JournalCarbohydrate Polymers
Issue number2
Publication statusPublished - Mar 1 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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