Formation and characterization of cellulose films from a liquid crystalline solution of cellulose in ammonia/ammonium thiocyanate

Autor:	Kap S. Yang, Yue-Shen Chen, John A. Cuculo
Rok vydání:	1990
Předmět:	Materials science Polymers and Plastics Thiocyanate General Chemistry Surfaces Coatings and Films Solvent Crystallinity chemistry.chemical_compound Ammonia chemistry Chemical engineering Liquid crystal Phase (matter) Materials Chemistry Organic chemistry Ammonium thiocyanate Cellulose
Zdroj:	Journal of Applied Polymer Science. 41:587-594
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.1990.070410310
Popis:	Films were cast from liquid crystalline solutions of cellulose in an ammonia (NH3)/ammonium thiocyanate (NH4SCN) solvent. Microscopic examination of the cellulose liquid crystalline solutions used for the film formation exhibited the so-called conjugated phase. It displayed a fingerprint and a uniformly dispersed highly birefringent pattern. Without additives, the films made from these liquid crystalline solutions are clear, flexible, and have high strength comparable to commercial Cellophone® films. The infrared crystallinity index of the film was somewhat higher than that of other cellulose II materials.
Databáze:	OpenAIRE
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