Can I read Effect of the Velocity Gradient on Intrinsic Viscosity of Polymers in Solution on EtoBox?

Effect of the Velocity Gradient on Intrinsic Viscosity of Polymers in Solution by A. Peterlin is a Materials Science article available to read on EtoBox.

What is Effect of the Velocity Gradient on Intrinsic Viscosity of Polymers in Solution about?

## Abstract For a soft free‐draining coil that changes its shape quite easily in flow, intrinsic viscosity does not depend on velocity gradient. The deformation and extension of the coil in flow, which increases the contribution of the single molecule, is just compensated for by the decrease in number of molecules crossing the flow plane and thus actually contributing to the additional shear stress. The finite valence angle and the restricted rotation around the valence bond, however, not only extend but also stiffen the molecule. The completely stiff coils—an idealization that never occurs but is very suitable for computing purposes—are oriented in the flow without any alteration of their shapes and shape distribution. The intrinsic viscosity thereby decreases with increasing orientation. The effect is the more accessible the longer the molecule, the deviations from the initial viscosity at rest being proportional to the square of the gradient and the fourth power of the degree of polymerization. The real molecules are neither quite stiff nor completely soft. Thus their intrinsic viscosity ought to lie between the two limiting cases, the decrease with the gradient being smaller th

Who reads Effect of the Velocity Gradient on Intrinsic Viscosity of Polymers in Solution?

Author

A. Peterlin

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley (ISSN 0022-3832)

Published

1952

Language

EN

Field

Materials Science (Physical Sciences)