The thermotropic and lyotropic liquid-crystalline properties of acetoacetoxypropyl cellulose

The thermotropic and lyotropic liquid-crystalline properties of acetoacetoxypropyl cellulose

Acetoacetoxypropyl cellulose, formed by the acetoacetylation of hydroxypropyl cellulose using a diketene/acetone adduct at elevated temperature, forms both thermotropic and lyotropic liquid‐crystalline phases. DSC and hot‐stage polarized light microscopy confirmed the thermotropic nature of the bulk...

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Veröffentlicht in:Journal of polymer science. Part B, Polymer physics Polymer physics, 1987-11, Vol.25 (11), p.2293-2301
Hauptverfasser: Pawlowski, Walter P., Gilbert, Richard D., Fornes, Raymond E., Purrington, Suzanne T.
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Sprache:eng
Schlagworte:
Applied sciences
Cellulose and derivatives
Exact sciences and technology
Natural polymers
Physicochemistry of polymers
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container_end_page 2301
container_issue 11
container_start_page 2293
container_title Journal of polymer science. Part B, Polymer physics
container_volume 25
creator Pawlowski, Walter P.
Gilbert, Richard D.
Fornes, Raymond E.
Purrington, Suzanne T.
description Acetoacetoxypropyl cellulose, formed by the acetoacetylation of hydroxypropyl cellulose using a diketene/acetone adduct at elevated temperature, forms both thermotropic and lyotropic liquid‐crystalline phases. DSC and hot‐stage polarized light microscopy confirmed the thermotropic nature of the bulk polymer. Thin layers showed green reflection colors at room temperature. The wavelength λ0 of selective reflection was measured spectrophotometrically. The crystalline structure of the polymer was investigated using x‐ray diffraction. A lyotropic mesophase formed in acetic acid at ≥ 40 wt% polymer. The value of λ0 for the lyotropic cholesteric mesophase was determined by optical rotatory dispersion (ORD) and circular dichroism (CD) of a thin layer of a wholly anisotropic solution.
doi_str_mv 10.1002/polb.1987.090251107
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DSC and hot‐stage polarized light microscopy confirmed the thermotropic nature of the bulk polymer. Thin layers showed green reflection colors at room temperature. The wavelength λ0 of selective reflection was measured spectrophotometrically. The crystalline structure of the polymer was investigated using x‐ray diffraction. A lyotropic mesophase formed in acetic acid at ≥ 40 wt% polymer. 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subjects Applied sciences
Cellulose and derivatives
Exact sciences and technology
Natural polymers
Physicochemistry of polymers
title The thermotropic and lyotropic liquid-crystalline properties of acetoacetoxypropyl cellulose
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