Results 251 to 260 of about 168,848 (298)

Intrinsic viscosity of polyacrolein

Journal of Polymer Science Part C: Polymer Symposia, 1965
AbstractWhen acrolein is polymerized to polyacrolein, a rapid control procedure is required in order to follow the degree of polymerization. Polyacrolein is insoluble in most organic liquids and in water but dissolves in sulfurous acid with the formation of a polyelectrolyte.
openaire   +1 more source

Intrinsic viscosity calculated by computer

Journal of Applied Polymer Science, 1973
AbstractA computer program has been devised for routine use which processes raw data such as polymer sample weight, moisture content, solution volume, and viscometer flow times to calculate a least‐squares‐derived intrinsic viscosity. In addition to eliminating errors inherent in graphic solutions and freeing technicians from tedious calculation, the ...
B. T. Hofreiter, J. O. Ernst, W. L. Williams   +2 more
openaire   +1 more source

Analysis of intrinsic viscosity data

Journal of Polymer Science, 1961
AbstractIn order to interpret quantitatively intrinsic viscosity data for polymer solutions, especially for chains of poor flexibility, the partially free draining effect discussed in the theories of Kirkwood and Riseman and Debye and Bueche must be also taken into account, as well as the excluded volume effect considered in the theory of Flory and Fox.
Tōru Kawai, Kenji Kamide
openaire   +1 more source

INTRINSIC VISCOSITY OF COPOLYMERS

British Polymer Journal, 1969
AbstractThe intrinsic viscosity of a copolymer has been calculated using the method developed by Fixman. The result shows that the relation [η] = KM1/2 may be observed under certain conditions (where [η] is intrinsic viscosity, M is molecular weight, and K is a constant).
openaire   +1 more source

Intrinsic Viscosity of Polyelectrolytes

The Journal of Chemical Physics, 1969
The intrinsic viscosity and expansion factor of polyelectrolyte have been calculated by using the Debye–Hückel approximation to the potential of mean force between segments. The results obtained are compared with experiments by Takahashi and Nagasawa.
openaire   +1 more source

Intrinsic Viscosity of Wormlike Polymer Chains

The Journal of Chemical Physics, 1968
The intrinsic viscosity of wormlike polymer chains has been calculated using the Kirkwood–Riseman method. The chain statistics are taken from the Hermans and Ullman analysis of the Kratky–Porod model. Results are obtained for several degrees of chain extension for chains of varying molecular weight as a function of the degree of hydrodynamic ...
openaire   +2 more sources

Polymer Dynamics: Non-Newtonian Intrinsic Viscosity

The Journal of Chemical Physics, 1966
The operator techniques developed in the preceding paper are here applied to the determination of the intrinsic viscosity as a function of excluded volume and shear rate. The force constants which represent the excluded-volume interaction are determined, at nonvanishing shear rate, by a criterion of self-consistency. Numerical results are given for the
openaire   +2 more sources

Intrinsic Viscosity of Polymer Chains

The Journal of Chemical Physics, 1965
The intrinsic viscosity [η] of polymer chains is recalculated by methods similar to those of Kirkwood and Zimm. The theory is based on the preceding paper by Fixman, with the adoption of a smoothed excluded-volume potential and the following first-order approximation to the operator L which determines the segment coordinate distribution function ψ; for
Chong Wha Pyun, Marshall Fixman
openaire   +1 more source

Intrinsic viscosities of cellulose derivatives

Journal of Polymer Science, 1958
AbstractIntrinsic viscosities of cellulose acetates of degrees of substitution 2.86 and 3.00 and of cellulose trinitrate have been investigated as functions of temperature, solvent, and molecular weight. Large negative temperature coefficients (ca. −0.6% per degree) of [η] appear to be characteristic of cellulosic chains. These observed decreases in [η]
P. J. Flory, O. K. Spurr, D. K. Carpenter   +2 more
openaire   +1 more source

Intrinsic viscosity-temperature relationships

Polymer, 1981
Deodato Radic, Ligia Gargallo
openaire   +1 more source