Lyotropic mesophase of cellulose in ammonia/ammonium thiocyanate solution

Autor:	Yue-Shen Chen, John A. Cuculo
Rok vydání:	1986
Předmět:	Polymers and Plastics Thiocyanate Organic Chemistry Mesophase Degree of polymerization chemistry.chemical_compound Ammonia chemistry Chemical engineering Liquid crystal Lyotropic Materials Chemistry Organic chemistry Ammonium thiocyanate Cellulose
Zdroj:	Journal of Polymer Science Part A: Polymer Chemistry. 24:2075-2084
ISSN:	1099-0518 0887-624X
DOI:	10.1002/pola.1986.080240904
Popis:	Solutions of cellulose in a mixture of 27:73 (w/w) of liquid ammonia and ammonium thiocyanate become liquid crystalline at room temperature above a certain critical concentration which depends on the degree of polymerization of the dissolved cellulose. The high optical rotations of the solution suggest that the cellulose mesophase is cholesteric in nature. In the two-phase region, the cellulose solutions exhibit negatively birefringent spherulites that possess both ringed and nonringed internal structures. The anisotropic solutions can be oriented by shear, indicating high potential for spinning them into useful fibers.
Databáze:	OpenAIRE
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