ISSN:
1435-1536
Keywords:
Rheological aging
;
carboxymethylcellulose
;
micro-aggregates
;
viscosity
;
viscoelasticity
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Aqueous gels of carboxymethylcellulose in the free acid form (HCMC) are obtained when dialyzed sodium carboxymethylcellulose (NaCMC)-gels are treated with a strongly acidic ion exchanger. These gels age rheologically. During the aging process (maximum 60 days), thixotropy and increased viscoelasticity occur. The rheological changes are measured by shear viscosityη, coefficient of thixotropy H, complex dynamic shear modulus G*, shear storage modulusG′, shear loss modulusG″, and tangent of the phase angle. The aging process is caused by the formation of quasi-crystalline microaggregates of HCMC which can be detected by electron microscopy (Part II).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01410579
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