Swelling and mechanical properties of cellulose hydrogels. V. Swelling in concentrated alkaline solutions

Conference · Sat Jan 01 04:00:00 EST 1983 · J. Appl. Polym. Sci.: Appl. Polym. Symp.; (United States)

OSTI ID:6971419

Westman, L; Lindstroem, T

The swelling and mechanical properties of crosslinked regenerated cellulose gels in concentrated aqueous alkaline solutions (LiOH, NaOH, and KOH) were studied. Swelling maxima were found in NaOH at 2.75 M and in LiOH at 3.25 M, but no such maximum was observed in KOH. An increase in temperature or the presence of NaCl decreased the magnitude of swelling maxima. The gels exhibited typical rubber-like properties in concentrated NaOH. The results are qualitatively discussed in terms of the theory of swelling of polyelectrolytic gels, assuming deprotonization of the cellulose hydroxyl groups occurs in concentrated alkaline solutions. The reasons for the differences in swelling behavior in LiOH, NaOH, and KOH are discussed, as well as the changes in the gel structure which lead to a reduction in the degree of swelling in water after alkaline treatment. On the basis of results relating the creep compliance to the degree of swelling in water, it is suggested that these structural changes are similar to those occurring during the drying of water-swollen cellulose. 16 references, 9 figures, 1 table.

• Research Organization: Swedish Forest Products Research Lab., Stockholm
• OSTI ID: 6971419
• Report Number(s): CONF-8205234-Vol.1
• Conference Information: Journal Name: J. Appl. Polym. Sci.: Appl. Polym. Symp.; (United States)
• Country of Publication: United States
• Language: English

Related Subjects

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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ALKALI METAL COMPOUNDS
ALKALINE HYDROLYSIS
CARBOHYDRATES
CELLULOSE
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COLLOIDS
DECOMPOSITION
DISPERSIONS
GELS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROLYSIS
HYDROXIDES
LITHIUM COMPOUNDS
LITHIUM HYDROXIDES
LYSIS
MECHANICAL PROPERTIES
MOLECULAR STRUCTURE
MORPHOLOGICAL CHANGES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLYSACCHARIDES
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
QUANTITY RATIO
SACCHARIDES
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SOLVOLYSIS
SWELLING
TEMPERATURE DEPENDENCE