Citation: . CHOLESTERIC LIQUID CRYSTALLINE CHARACTER ON THE SURFACE OF CHITOSAN/POLYACRYLIC ACID COMPOSITES*[J]. Chinese Journal of Polymer Science, ;2001, 19(3): 247-253. shu

CHOLESTERIC LIQUID CRYSTALLINE CHARACTER ON THE SURFACE OF CHITOSAN/POLYACRYLIC ACID COMPOSITES*

Received Date: 4 May 2000

The cholesteric liquid crystalline structure in chitosan/polyacrylic acid composite films was studied by surfacetechniques. A periodical lamellar-like structure was observed in the permanganic acid etched film sufface by both scanningelectron microscopy (SEM) and atomic force microscopy (AFM), instead of the thumb-print texture which can be detectedwith polarized optical microscopy. It is suggested that the periodical lamellar-like structure is induced by the etchingselectivity between cholesteric layers due to different molecular arrangement on the film surface.Four kinds of perpendicular disclinations,i.e. χ→τ-+λ+,χ→λ-+τ+,χ→τ-+τ+ and χ→λ-+λ+, were found in the composite films from SEM observations.The smallest periodicity of lamellar-like structure(equals to half pitch)is 20～40 nm measured with AFM.
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