The formation of a lyotropic mesophase in aqueous solutions of the sodium salt of cellulose acetate sulfate

DD Grinshpan, NG Tsygankova, Svetlana Tret'yakova, TA Savitskaya

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Aqueous solutions of the sodium salt of cellulose acetate sulfate are shown to be isotropic at concentrations below 42 wt %, biphasic in the concentration range 42-52 wt % in which the isotropic phase-anisotropic phase transition is partially accomplished, and liquid-crystalline at a concentration of higher 52 wt %. The anisotropic phase is represented by different ordered supramolecular structures, such as individual spherulites, spherulite ribbons, fingerprint structures, and other more complex entities. Rheological curves typical of LC systems were recorded; the corresponding concentration and temperature dependences of shear viscosity also prove the existence of an LC state in aqueous solutions of the cellulose acetate sulfate sodium salt. The critical concentration corresponding to the transition of the sodium salt of cellulose acetate sulfate to the LC state at 293-323K was estimated at 52-52.5 wt %.
LanguageEnglish
Pages23-26
JournalPolymer Science Series B
Volume44
Issue number1-2
Publication statusPublished - Jan 2002

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Sulfates
Salts
Sodium
Shear viscosity
Phase transitions
Crystalline materials
Liquids
acetylcellulose
Temperature
sodium sulfate

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title = "The formation of a lyotropic mesophase in aqueous solutions of the sodium salt of cellulose acetate sulfate",
abstract = "Aqueous solutions of the sodium salt of cellulose acetate sulfate are shown to be isotropic at concentrations below 42 wt {\%}, biphasic in the concentration range 42-52 wt {\%} in which the isotropic phase-anisotropic phase transition is partially accomplished, and liquid-crystalline at a concentration of higher 52 wt {\%}. The anisotropic phase is represented by different ordered supramolecular structures, such as individual spherulites, spherulite ribbons, fingerprint structures, and other more complex entities. Rheological curves typical of LC systems were recorded; the corresponding concentration and temperature dependences of shear viscosity also prove the existence of an LC state in aqueous solutions of the cellulose acetate sulfate sodium salt. The critical concentration corresponding to the transition of the sodium salt of cellulose acetate sulfate to the LC state at 293-323K was estimated at 52-52.5 wt {\%}.",
author = "DD Grinshpan and NG Tsygankova and Svetlana Tret'yakova and TA Savitskaya",
year = "2002",
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The formation of a lyotropic mesophase in aqueous solutions of the sodium salt of cellulose acetate sulfate. / Grinshpan, DD; Tsygankova, NG; Tret'yakova, Svetlana; Savitskaya, TA.

In: Polymer Science Series B, Vol. 44, No. 1-2, 01.2002, p. 23-26.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The formation of a lyotropic mesophase in aqueous solutions of the sodium salt of cellulose acetate sulfate

AU - Grinshpan, DD

AU - Tsygankova, NG

AU - Tret'yakova, Svetlana

AU - Savitskaya, TA

PY - 2002/1

Y1 - 2002/1

N2 - Aqueous solutions of the sodium salt of cellulose acetate sulfate are shown to be isotropic at concentrations below 42 wt %, biphasic in the concentration range 42-52 wt % in which the isotropic phase-anisotropic phase transition is partially accomplished, and liquid-crystalline at a concentration of higher 52 wt %. The anisotropic phase is represented by different ordered supramolecular structures, such as individual spherulites, spherulite ribbons, fingerprint structures, and other more complex entities. Rheological curves typical of LC systems were recorded; the corresponding concentration and temperature dependences of shear viscosity also prove the existence of an LC state in aqueous solutions of the cellulose acetate sulfate sodium salt. The critical concentration corresponding to the transition of the sodium salt of cellulose acetate sulfate to the LC state at 293-323K was estimated at 52-52.5 wt %.

AB - Aqueous solutions of the sodium salt of cellulose acetate sulfate are shown to be isotropic at concentrations below 42 wt %, biphasic in the concentration range 42-52 wt % in which the isotropic phase-anisotropic phase transition is partially accomplished, and liquid-crystalline at a concentration of higher 52 wt %. The anisotropic phase is represented by different ordered supramolecular structures, such as individual spherulites, spherulite ribbons, fingerprint structures, and other more complex entities. Rheological curves typical of LC systems were recorded; the corresponding concentration and temperature dependences of shear viscosity also prove the existence of an LC state in aqueous solutions of the cellulose acetate sulfate sodium salt. The critical concentration corresponding to the transition of the sodium salt of cellulose acetate sulfate to the LC state at 293-323K was estimated at 52-52.5 wt %.

M3 - Article

VL - 44

SP - 23

EP - 26

JO - Polymer Science Series B

T2 - Polymer Science Series B

JF - Polymer Science Series B

SN - 1560-0904

IS - 1-2

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