Abstract
Abstract A study has been made of the effects of salts, alcohol and surface-active agents, of contamination by micro-organisms, and of storage at various temperatures on the viscosities of aqueous dispersions of methyl-, methylethyl-, and sodium carboxymethylcellulose. Small concentrations of salts decreased the viscosity of sodium carboxymethylcellulose sols but had no effect on methyl- and methylethylcellulose sols. Larger amounts caused the viscosities of methyl- and methylethylcellulose sols to increase. Industrial methylated spirit, propylene glycol and glycerol increased the viscosities of all dispersions. The effect of sodium lauryl sulphate on sodium carboxymethylcellulose sols was similar to that of salts, and cetrimide precipitated the derivative. Methyl- and methylethylcellulose dispersions increased and then decreased in viscosity with increasing concentrations of sodium lauryl sulphate; cetrimide increased the viscosity. All derivatives were degraded by micro-organisms. The viscosity of preserved dispersions of methyl- and methyethylcellulose altered little over a year. The greatest decreases occurred in the highest viscosity grade samples stored at the highest temperature (30°). All dispersions of sodium carboxymethylcellulose decreased in viscosity over the storage period; storage in light producing the most unstable sols. The pH change of any dispersion on storage was negligible.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
