Viscoelastic Properties of Dilute Polymer Solutions.
Final rept. 1 Feb 71-31 Oct 74,
WISCONSIN UNIV MADISON
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The storage and loss shear moduli of dilute solutions of a large number of polymers carefully characterized samples, mostly with narrow molecular weight distribution have been measured in a frequency range from 100 to 8000 Hz and the data have been extrapolated to infinite dilution for comparison with molecular theories. Linear flexible polymers include poly-alpha-methyl styrene, 1,4-polybutadiene, and polydimethyl siloxane branched flexible polymers stars, combs, and randomly branched include polystyrene, 1,4-polybutadiene, and ethylene-propylene copolymers rigid and semirigid polymers include tobacco moasic virus, poly-gamma-benzyl-L-glutamate, and poly-n-hexyl isocyanate. Different molecular weights were studied. Several branched polystyrenes were studied in high-viscosity solvents to obtain limiting high-frequency behavior. The results have been interpreted by molecular theories in terms of the structure, conformation, internal flexibility, and modes of Brownian motion of these molecules.
- Polymer Chemistry
- Atomic and Molecular Physics and Spectroscopy