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One‐point method to calculate molecular weight from low‐angle laser light scattering data. I. Application to acrylamide polymers
Author(s) -
Hunkeler D.,
Hamielec A. E.
Publication year - 1988
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.1988.070350616
Subject(s) - dispersity , virial coefficient , rayleigh scattering , polymer , static light scattering , light scattering , scattering , materials science , radius of gyration , acrylamide , molar mass distribution , polymer chemistry , optics , thermodynamics , physics , copolymer , composite material
A new method for the calculation of the weight‐average molecular weight from low‐angle laser light scattering data has been developed which only requires the measurement of the Rayleigh factor at a single concentration. The method requires the knowledge of the dependence of the second virial coefficient on molecular weight and has been applied to polyacrylamides ranging in molecular weight from 10,000 to 9,000,000. The new method improves the accuracy of light scattering measurements to ±4.7% compared with ±11.2% for the conventional procedure and requires only one‐fourth the time. The effect of polydispersity has been included in the procedure. The method is general and is recommended for all linear polymers.