High‐temperature dynamic laser light‐scattering characterization of polyethylene in trichlorobenzene | Zendy

Wu Chi | Zendy; Lilge Dieter | Zendy

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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.

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