ISSN:
1436-2449
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Summary This paper concerns the viscosity dependence of Xanthan as a function of polymer concentration, shear rate and molecular weight in the ordered conformation. The different samples with various molecular weights are obtained by ultrasonication. A unique curve is obtained for the reduced specific viscosity ( $$\eta _{sp/} \eta _{sp_0 } $$ ) as a function of γ · γ r −1 for the different molecular weight samples and polymer concentrations below an overlap concentration C [η]0⩽ 1.5. The master curve giving the relation $$\eta _{sp_0 } $$ as a function of C [η]0 is drawn and compared with that of polystyrene in good solvent. The largest increase of $$\eta _{sp_0 } $$ in semidilute solution may be due to larger interchain interactions and to larger stiffness of the Xanthan molecule.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00708475
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