DETERMINATION OF MOLECULAR-WEIGHT DISTRIBUTION OF WATER-SOLUBLE MACROMOLECULES BY DYNAMIC LIGHT-SCATTERING
Polymers and High Performance Materials
An algorithm for the extraction of molecular weight distributions of typical high molecular weight, water-soluble polymers from dynamic light scattering has been developed. A function fit method was used to determine the best distribution parameters of a generalized exponential function. The algorithm employs a Marquardt-Levenburg constrained nonlinear least squares regression. A series approximation of the integral equation which is generated was attempted. This approach was abandoned because of difficulties with series convergence. A modified Rhomberg numerical integration was utilized with limited success. Two water-soluble polymer molecular weight distributions were obtained. The distributions of a polyethyleneoxide and a polyacrylamide were determined and compared with distributions obtained using gel permeation chromatography. The two methods were in fair agreement.
ACS SYMPOSIUM SERIES
Hester, R. D.
(1991). DETERMINATION OF MOLECULAR-WEIGHT DISTRIBUTION OF WATER-SOLUBLE MACROMOLECULES BY DYNAMIC LIGHT-SCATTERING. ACS SYMPOSIUM SERIES, 467, 276-290.
Available at: http://aquila.usm.edu/fac_pubs/7066