Laser light scattering characterization of molecular weight distribution of worm-like chains poly(1,4-phenylene terephthalamide) in concentrated sulfuric acid

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Journal of Colloid and Interface Science


By combining static and dynamic light scattering measurements, we have succeeded in determining the molecular weight distribution of poly(1,4-phenylene terephthalamide) in concentrated sulfuric acid using Laplace inversion of the photoelectron autocorrelation function. The complex method of data analysis can be greatly simplified for on-line monitoring purposes by measuring the difference correlation functions whereby changes of molecular weight and of polydispersity can be detected quantitatively by photon correlation measurements at a fixed scattering angle and finite concentration even for worm-like chains. Effects due to concentration, intramolecular interference, and internal motions can be taken into account in the empirical procedure.


This paper is dedicated to Dr. Milton Kerker on the occasion of his 65th birthday.

Work supported by the National Science Foundation, Polymers Program (DMR 8314193), and the Petroleum Research Fund, administered by the American Chemical Society.

Copyright © 1985 Published by Elsevier Inc.