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High‐temperature dynamic laser light‐scattering characterization of polyethylene in trichlorobenzene
Author(s) -
Wu Chi,
Lilge Dieter
Publication year - 1993
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.1993.070501011
Subject(s) - polyethylene , molar mass distribution , molar mass , analytical chemistry (journal) , dynamic light scattering , light scattering , materials science , laser , diffusion , chemistry , polymer chemistry , scattering , polymer , chromatography , thermodynamics , optics , composite material , physics , nanotechnology , nanoparticle
Polyethylene samples were characterized in trichlorobenzene at 135°C by high‐temperature dynamic laser light scattering (LLS). Precise measurements of the intensity‐intensity time correlation function permit us to make a Laplace inversion to obtain an estimate of the normalized translational diffusion coefficient distribution [ G(D) ]. After establishing a calibration between the translational diffusion coefficient ( D ) and molar mass, by using six moderately dispersed polyethylene samples, we were able to transform G(D) to molecular weight distribution (MWD), and to calculate the weight average molecular weight ( M w ), which weights were comparable with the ones obtained by using static LLS and size exclusion chromatograph (SEC). The advantages and limitations of using dynamic LLS as a routine method to characterize of polyethylene are discussed. © 1993 John Wiley & Sons, Inc.