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Some physical properties of films made from cellulose dissolved in solutions of nitrogen dioxide in dimethylformamide
Author(s) -
Venkateswaran A.,
Clermont L. P.
Publication year - 1974
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.1974.070180112
Subject(s) - vinyl alcohol , crystallinity , cellulose , cellophane , dissolution , relative humidity , sorption , materials science , dimethylformamide , polymer chemistry , nitrogen , moisture , nitrogen dioxide , chlorine dioxide , chemical engineering , adsorption , chemistry , inorganic chemistry , organic chemistry , solvent , polymer , composite material , physics , engineering , thermodynamics
Water‐soluble films of cellulose nitrate‐nitrite were prepared by dissolving bleached sulfite pulp in a solution of nitrogen dioxide in dimethylformamide (DMF) at room temperature and heating the solution at 70°C for about 3 hr. Their water sorption, fine structure, and electrical properties were measured and compared with those of three other films—one water soluble (poly(vinyl alcohol)) and two water insoluble (cellophane and a film prepared from a cellulose solution in the nitrogen dioxide–DMF mixture and cast immediately after the cellulose had dissolved at room temperature). A comparison between the properties of water‐soluble films and the poly(vinyl alcohol) film showed that the former had higher crystallinity, lower moisture absorption in the 0–80% relative humidity region, lower permittivity and a.c. conductance, and higher d.c. resistance. The DMF‐cast water‐insoluble film adsorbed less moisture than the cellophane film.