AN INVESTIGATION OF THE RHEOLOGY OF GELS,
Abstract
The report describes work accomplished on the rising sphere rheometer and efforts to develop a standard gel to be used for interlaboratory comparisons both on the rising sphere and on the Brookfield viscometer. The construction details and wiring for the rheometer and an optical method for checking the rate of rise are presented. It was found that the accuracy of the rheometer could be greatly improved by expanding and displaying the output scale on a Leeds and Northrup recorder. Several batches of a 'standard' gel (0.15-percent Carbopol 940 in water) were tried but gave inconsistent results with this rheometer, as well as not giving consistent densities. The results of these tests seem to indicate that Carbopol 940 is not suitable as a component in standard gels, if unsophisticated mixing methods are to be used. In addition, Cabosil (2 concentrations tried), Methocell 90HG-D65 (3 concentrations tried), and Cellosize 5229-JJ were tried with water all mixed by hand shaking. All samples failed to demonstrate reasonable yield values or settled on standing. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 22, 1966
- Accession Number
- AD0641484
Entities
People
- Barry D. Allan
- Joel H. Blatt
Organizations
- United States Army Aviation and Missile Command