Accession Number : ADA001600

Title :   Viscoelastic Properties of Dilute Polymer Solutions.

Descriptive Note : Final rept. 1 Feb 71-31 Oct 74,


Personal Author(s) : Ferry,John D.

Report Date : 01 NOV 1974

Pagination or Media Count : 10

Abstract : 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.

Descriptors :   *Polymers, *Solutions(Mixtures), *Viscoelasticity, Styrene plastics, Molecular weight, Shear properties, Molecular structure, Polystyrene, Polybutadiene, Siloxanes

Subject Categories : Polymer Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE