Date of Award

Summer 1989

Document Type

Thesis

Department

Mechanical & Aerospace Engineering

Program/Concentration

Engineering Mechanics

Committee Director

S. N. Tiwari

Committee Director

T. H. Hou

Committee Member

J. W. Hou

Call Number for Print

Special Collections; LD4331.E57H83

Abstract

Several methods are reviewed by which the molecular weight (MW) and molecular weight distribution (MWD) of polymeric material were determined from the rheological properties. A poly (arylene ether) polymer with six different molecular weights was used in this investigation. Experimentally measured MW and MWD were conducted by GPC/LALLS (Gel Permeation Chromatography/Low Angle Laser Light Scattering), and the rheological properties of the melts were measured by a Rheometric System Four rheometer. It was found that qualitative information of the MW and MWD of these polymers could be derived from the viscoelastic properties, with the methods proposed by Zeichner and Pate1, and by Dormier et al., by shifting the master curves of the dynamic storage modulus, G', and the loss modulus, G”, along the frequency axis. Efforts were also made to calculate quantitative profiles of MW and MWD for these polymers from their rheological properties. The technique recently proposed by Wu was evaluated. It was found that satisfactory results could only. be obtained for polymers with single modal distribution in the molecular weight.

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DOI

10.25777/v9dv-1d74

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