ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Dynamic studies on polymeric liquidsThis work was supported by the Reconstruction Finance Corporation, Synthetic Rubber Division, at the Mellon Institute of Industrial Research.Presented at the International Congress of Pure and Applied Chemistry, New York, September, 1951. (1952)

Harper, R. C. ; Markovitz, H. ; Dewitt, T. W.

Hoboken, NJ : Wiley-Blackwell

Journal of Polymer Science 8 (1952), S. 435-443

add to mindlist on the mindlist

Details

ISSN: 0022-3832

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: The dynamic properties of low molecular weight polyisobutylene and silicone oils have been investigated over a range of frequencies and temperatures. When subjected to oscillating stresses, these materials behave as though they had a shear modulus as well as a viscosity. Dynamic viscosities and rigidities have been determined at frequencies between 10 and 100 cycles per second and at temperatures between -50° and +60°C. Falling ball viscosities were also obtained over the same temperature range. In general, moduli increase with increasing frequency and decreasing temperature while dynamic viscosities decrease with increasing frequency and increasing temperature. At room temperature and above, the dynamic viscosity varies very little with the frequency and is essentially the same as the falling ball viscosity. At lower temperatures the dynamic viscosity decreases considerably with increasing frequency but extrapolates to the falling ball viscosity at zero frequency. If these materials are regarded as complex Maxwell liquids, the dynamic rigidities and viscosities may be written as functions of a “reduced frequency” equal to the frequency multiplied by an exponential of a constant divided by the absolute temperature. This constant can be evaluated from the slope of the linear plot of the logarithm of the falling ball viscosity over the absolute temperature versus the reciprocal of the absolute temperature. For a given material a single constant suffices to bring the data at all frequencies and temperatures into a single plot similar to that used by Ferry.

Additional Material: 8 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pol.1952.120080407

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Editorial (1967)

Fox, T. G. ; Casassa, E. F. ; Markovitz, H.

New York : Wiley-Blackwell

Journal of Polymer Science Part A-2: Polymer Physics 5 (1967), S. i