섬유

Synthesis of Hydroxypropyl Derivatives of Chitosan and Observation of Phase Behavior of Their Aqueous Solutions.

  • 출판일1999.06
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 219
An experiment synthesized hydroxypropyl derivatives of chitosan with different degrees of substitution (DSs) via etherification of chitosan with propylene oxide. Light absorption, polarized optical microscopy (POM), and small angle light scattering analyzed the phase behavior and liquid crystalline properties of aqueous solutions of hydroxypropyl chitosan (HPCt). Aqueous solutions of a highly substituted HPCt (DS = 3.25) were phase separated and became turbid at an elevated temperature of greater than 40 degrees centigrade. The observed cloud point shifted to higher temperatures with an increase in HPCt concentration in the range examined (5-6 percent by weight). The addition of inorganic salts affected the phase separation behavior of the HPCt solutions. POM revealed the prevalence of an optically anisotropic monophase in the concentrated solution containing 50 percent or more by weight PHCt (DS = 3.25). refs.
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