The effect of shear rate on the molecular weight determination of acrylamide polymers from intrinsic viscosity measurements | Zendy

Shawki S. M. | Zendy; Hamielec A. E. | Zendy

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The effect of shear rate on the molecular weight determination of acrylamide polymers from intrinsic viscosity measurements

Author(s) -

Shawki S. M.,

Hamielec A. E.

Publication year - 1979

Publication title -

journal of applied polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.575

H-Index - 166

eISSN - 1097-4628

pISSN - 0021-8995

DOI - 10.1002/app.1979.070231118

Subject(s) - viscometer , rheology , shear rate , polymer , thermodynamics , intrinsic viscosity , capillary action , viscosity , shear (geology) , apparent viscosity , materials science , polymer chemistry , newtonian fluid , reduced viscosity , chemistry , composite material , physics

The rheological response of dilute solutions of high molecular weight polyacrylamides at low shear rates has been measured using a capillary viscometer that provided for a fivefold variation in shear rate at each concentration. The non‐Newtonian effects were found to be significant for polyacrylamides with number‐average molecular weights exceeding 10 6 . The molecular weight average–intrinsic viscosity relationship most widely used in the literature, [η] = 6.80 × 10 −4 M n 0.66, was found to be valid when [η] was measured at high shear rates where the polymer solutions approached Newtonian behavior. A new relationship was developed relating M n to the intrinsic viscosity extrapolated to zero shear rate.

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