Viscosimetry of Polymers and Polyelectrolytes (Springer - download pdf or read online

By Werner-Michael Kulicke

ISBN-10: 354040760X

ISBN-13: 9783540407607

This laboratory instruction manual bargains transparent directions and counsel for the sensible daily software of viscosimetry, in addition to providing a complete significant other for the translation of viscosimetric info from basic to advanced polymer solutions.

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Extra resources for Viscosimetry of Polymers and Polyelectrolytes (Springer Laboratory)

Example text

The correction term Ail is determined by measuring with different depths of immersion, and then plotting the measured torques 7* against the depth of immersion. From the equation T-^TRT^-^^ (3 U) - 3 Execution of Viscosity Measurements 20 A/i is the negatives-axis intersection. , all straight lines for all different viscosities intersect at the point T=0 and /t=-A/i. This is only true for Newtonian fluids or in the case of a Non-Newtonian fluid if the region of the zero shear viscosity is not left in any measurement.

The test with the flow cup is a one-point measurement and only gives a viscosity value that is determined under the given measurement conditions. In the short capillary, no stationary laminar flow profile can be build up, since the inlet and acceleration part is often greater than the viscous part. Because of the undefined flow form in the short capillary, further parameters cannot be determined. Even though flow cups are still a widely used method for the determination of a characteristic efflux time for example for coating compounds.

Another example for decreasing material functions in dependence of time is sodium poly(styrene sulfonate) (PSSNa). The determination of the intrinsic viscosity described in Chap. 5, Fig. 4 was therefore only performed for molar masses ^LSxlO* g mol 1 , because higher molar masses show a time dependent intrinsic viscosity. ,) or low storage temperatures (-34 °C) those aging effects were eliminated. Additional aging effects could be found for graft copolymers (starch-acrylamide copolymers [36], synthetic amylose [36],poiy(acrylamide-co-methacryloxyethylN,N,N,-trimethylammoniumchloride) PAAm/M [30] and poly(acrylamide-cosodium-2-sulfoethylmethacrylate) [37].

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Viscosimetry of Polymers and Polyelectrolytes (Springer Laboratory) by Werner-Michael Kulicke


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