PROPERTIES AND THERMAL BEHAVIORS OF 2, 3-DICARBOXY CELLULOSE METALLIC SALTS

Abstract

2, 3-Dicarboxy cellulose oxidized to nearly 100% of the theoretical was prepared by the selective oxidation of commercial cellulose powder with periodate, and by following oxidation with acidified sodium chlorite solution.
The 2, 3-dicarboxy cellulose prepared was completely soluble in water, but formed precipitate or massive solid in the aqueous solution of most metallic ions other than alkali metals.
2, 3-Dicarboxy cellulose metallic salts of metallic ions having 6Å effective ionic radii in an aqueous medium gave sticky, gel-like products on heating with addition of water.
Thermal analyses of these products showed that 2, 3-dicarboxy cellulose metallic salts had higher thermal stability than the original dicarboxy cellulose, and that considerable differences in the thermal stability depended on the kind of metallic ion. From a view point of the thermal stability, the zinc salt was the highest and the copper one the lowest. On the other hand, calcium salt had the anomalous thermal behavior.