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Thermal and structural properties of tri‐ O ‐substituted cellulose ethers
Author(s) -
Isogai Akira,
Ishizu Atsushi,
Nakano Junzo
Publication year - 1985
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1985.070300130
Subject(s) - thermotropic crystal , liquid crystal , differential scanning calorimetry , phase (matter) , materials science , cellulose , diethylamine , sodium hydroxide , crystallography , organic chemistry , polymer chemistry , chemistry , liquid crystalline , thermodynamics , physics , optoelectronics
Tri‐ O ‐substituted cellulose ethers prepared by the use of SO 2 –diethylamine (DEA)–dimethylsulfoxide (DMSO) and powdered sodium hydroxide were characterized by measurement of melting points and degradation points and by differential scanning calorimetric (DSC) and X‐ray analyses. Their thermal and structural characteristics were ascertained to be dependent on the kinds of substituents. Among the ethers examined, four kinds of arylmethylcelluloses showed the characteristics of thermotropic liquid crystals (smectic). Tri‐ O ‐α‐naphthylmethyl‐cellulose showed the three transformations due to a solid–smectic phase, a smectic–nematic phase, and a nematic–isotropic phase transformation. This thermotropic liquid crystal was enantiotropic below 200°C.