Thixotropy of different concentrations of microcrystalline cellulose:sodium carboxymethyl cellulose gels.
An extensive study is made of the rheologic behavior of microcrystalline cellulose:sodium carboxymethyl cellulose gels at six different concentrations (between 1 and 2.5% by weight). The thixotropy of these gels was analyzed in terms of agitation time, the duration of storage, concentration, and temperature; a semiempirical function was thus obtained providing thixotropic area as a function of these variables. The instantaneous variation rate in thixotropic area was defined, providing a better understanding of the rate of structural breakdown. Also, it is shown that after 5 min of agitation, the variation rate becomes negligible (approximately 0.7% of the initial value); this result is practically independent of the remaining variables.
Dolz-Planas
M
M
Department of Thermodynamics, Faculty of Pharmacy, Valencia University, Spain.
Roldan-Garcia
C
C
Herraez-Dominguez
J V
JV
Belda-Maximino
R
R
D002266:Carboxymethylcellulose Sodium / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D005782:Gels; D008956:Models, Chemical; D012212:Rheology
D005782:Gels; D002482:Cellulose; D002266:Carboxymethylcellulose Sodium