Results 241 to 250 of about 1,359,714 (335)

The intrinsic viscosity of linear DNA

Biopolymers, 2011
AbstractWe measured the intrinsic viscosity of very small synthetic DNA molecules, of 20–395 base pairs, and incorporated them in a nearly complete picture for the whole span of molecular weights reported in the literature to date. A major transition is observed at M ∼ 2 × 106.
Achilleas, Tsortos, George, Papadakis, Electra, Gizeli   +2 more
openaire   +3 more sources

Intrinsic viscosity of polystyrene

Journal of Polymer Science: Polymer Physics Edition, 1979
AbstractZero‐shear‐rate intrinsic viscosities [η]0 in benzene at 25°C and in cyclohexane at 34.5°C were measured for two series of polystyrene samples: six fractions ranging in Mw(weight‐average molecular weight) from 8.8 × 106 to 5.7 × 107 and 11 “monodisperse” samples ranging in Mw from 4 × 103 to 4.8 × 106.
Y. Einaga, Y. Miyaki, H. Fujita
openaire   +1 more source

Intrinsic viscosity of oligo- and polyisobutylenes: treatments of negative intrinsic viscosities

Macromolecules, 1991
The intrinsic viscosity, [η], was determined for 19 samples of oligo- and polyisobutylenes in the M w range from 1.12×10 2 to 1.79×10 6 in isoamyl isovalerate at 25.0 o C (θ) and in benzene at 25.0. o C (θ)•[η] is negative for isobutylene dimers in both solvents.
Fumiaki Abe, Yoshiyuki Einaga, Hiromi Yamakawa   +2 more
openaire   +1 more source

The Intrinsic Viscosity

2004
The number of parameters that have influence on the flow behavior of a polymer solution is, as will be shown in the upcoming chapters, enormous and makes it difficult to interpret the viscosimetric measurements. For this reason, viscosimetric measurements are carried out with dilute sample solutions to minimize the interactions of the single polymer ...
Werner-Michael Kulicke, Christian Clasen
openaire   +1 more source

Intrinsic Viscosity of Gelatin

Nature, 1962
THE intrinsic viscosity ([η]) is commonly used to characterize high polymers; but its determination is often complicated by adsorption of the high-polymer solute to the apparatus1. It has been widely assumed and has recently been categorically stated2 that adsorption effects can be neglected in the determination of the intrinsic viscosity of gelatin ...
J. W. JANUS, R. L. R. DARLOW
openaire   +1 more source

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

Dependence of intrinsic viscosity and molecular size on molecular weight of partially hydrolyzed polyacrylamide

, 2021
Hao Zhang, Yujun Feng
semanticscholar   +1 more source