The Hydrodynamic Volume of the Heteropoly Hexamolybdocobaltate (III) Anion from Viscosity Measurements

1959 ◽  
Vol 63 (12) ◽  
pp. 2083-2084 ◽  
Author(s):  
Michael T. Pope ◽  
Louis C. W. Baker
Keyword(s):  
Hydrodynamic Volume ◽  
Viscosity Measurements

LIQUID VISCOSITY MEASUREMENTS OF LUNAR HIGHLAND AND MARE IMPACT MELT SIMULANTS: JSC-1A, STILLWATER ANORTHOSITE, AND STILLWATER NORITE

2016 ◽  
Author(s):  
Aaron A. Morrison ◽  
◽  
Michael Zanetti ◽  
Christopher W. Hamilton ◽  
Einat Lev ◽  
...  
Keyword(s):  
Liquid Viscosity ◽  
Impact Melt ◽  
Viscosity Measurements

Extraction of Reliable Molecular Information from Diffusion NMR Spectroscopy: Hydrodynamic Volume or Molecular Mass?

2019 ◽  
Vol 25 (42) ◽  
pp. 9930-9937 ◽  
Author(s):  
Francesco Zaccaria ◽  
Cristiano Zuccaccia ◽  
Roberta Cipullo ◽  
Alceo Macchioni
Keyword(s):  
Nmr Spectroscopy ◽  
Molecular Mass ◽  
Hydrodynamic Volume ◽  
Diffusion Nmr ◽  
Molecular Information

Structure and Solution Properties of High Molecular Weight Butadiene-Styrene Copolymers

1957 ◽  
Vol 30 (1) ◽  
pp. 315-325
Author(s):  
R. B. MacFarlane ◽  
L. A. McLeod
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Complex Structure ◽  
Mixed Solvents ◽  
Solution Time ◽  
Solution Viscosity ◽  
Solution Properties ◽  
Molecular Weight Range ◽  
Viscosity Measurements ◽  
Commercial Practice

Abstract Production of high molecular weight copolymers of butadiene and styrene for use in oil-extended rubbers has aroused interest in the solution properties of copolymers above the molecular weight range commonly encountered in commercial practice. It has been observed that solubility of such polymers in toluene is a time-dependent phenomenon and the apparent solubility can increase continuously, in the absence of agitation, for as long as 800 hours. Although a standard Harris cage solubility test may show the presence of 50% gel, other properties do not confirm the presence of any appreciable quantities of insoluble material. Mild agitation rapidly promotes almost complete solubility. Dilute solution viscosity measurements are very misleading unless the influence of solution time is recognized and apparent intrinsic viscosities rise progressively with time of contact of the sample with solvent. This time-dependence of solution has been found to occur at conversions higher than 50% and is also a function of the amount of modifier used in the polymerization recipe. It has not been possible to shorten the solution time for viscosity measurements by mild heating or gentle agitation. Mixed solvents cause a change in the amount of increase of the apparent intrinsic viscosity but do not shorten the time to equilibrium. Measurement of the slope constant in the Huggins viscosity equation indicate that these solubility and viscosity effects coincide with the appearance of a marked degree of branching in the polymer molecules. The effect is, therefore, interpreted as being caused by the relatively slow disentanglement of molecules of complex structure.

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