Results 261 to 270 of about 192,349 (315)

Time-temperature superposition and linear viscoelasticity of polybutadienes

Macromolecules, 1995
A series of monodisperse polybutadienes has been used to perform mechanical relaxation measurements from the flow regime to the glassy state. Results on loss shear moduli have been analyzed within the framework of a coupling model. It has been found to represent well the frequency dependence in the glassy and terminal zones using a segmental motion ...
Palade, L., Verney, Vincent, Attané, P.
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Time—temperature superposition of n-hexane sorption in polystyrene

Journal of Membrane Science, 1984
Abstract Liquid n-hexane sorption in glassy polystyrene has been analyzed in the range of temperatures between 20 and 60°C. The superposition of relaxation-controlled transport and Fickian diffusion leads, in the same experimental time scale, to an apparent time-dependent behavior. Initially, a sharp boundary advances with a constant velocity through
NICOLAIS L, APICELLA, Antonio, DE NOTARISTEFANO C.   +2 more
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Fractional relaxation and the time-temperature superposition principle

Rheologica Acta, 1994
Relaxation processes in complex systems like polymers or other viscoelastic materials can be described by equations containing fractional differential or integral operators. In order to give a physical motivation for fractional order equations, the fractional relaxation is discussed in the framework of statistical mechanics.
Walter G. Glöckle, Theo F. Nonnenmacher
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Time-temperature superposition. Review

Polymer Mechanics, 1976
Experimental attempts to confirm the applicability of time-temperature superposition as a means of predicting the deformation of polymeric materials are reviewed. Examples of the use of the method for the accelerated testing of amorphous and crystalline thermoplastics, thermosets, and composites are presented.
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Study on the transferability of the time temperature superposition principle to emulsions

International Journal of Cosmetic Science, 2006
SynopsisThe instability of emulsions is basically clarified by a phase separation. The separated phase can either cream or sediment. Destabilization is mostly compounded by coalescence and gives a first indication through extension of droplets. In the cosmetics industry as well as many other branches of industry such as the food industry and paint and ...
M. Muehlbach, R. Brummer, R. Eggers
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Time–temperature superposition of the dynamic birefringence of polyethylene

Journal of Polymer Science Part A-2: Polymer Physics, 1967
AbstractThe dynamic strain‐optical coefficient of low‐density polyethylene is found to decrease with increasing frequency and increase with increasing temperature (at temperatures up to 60°C.). It is found that a series of curves representing the real, K′, and imaginary, K″, parts of the frequency variation of the strain‐optical coefficient obtained at
A. Takeuchi, Richard S. Stein
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Creep of Geotextiles Using Time–Temperature Superposition Methods [PDF]

Journal of Geotechnical and Geoenvironmental Engineering, 2004
The objective of this study is to evaluate the creep deformations, creep failure, and residual tensile strength of geosynthetics using accelerated time-temperature procedures and procedures consistent with rapid tensile testing. The study proposes new definitions for the quantification of creep, of creep failure, and of the reference strength for ...
Brett R. Byler, Jorge G. Zornberg, Justin W. Knudsen   +2 more
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The application of time-temperature superposition to printing inks

Rheologica Acta, 1978
A simple model ink consisting of 80% polybutene and 20% pigment was tested for time-temperature superposition. The principle appeared to work but when the polybutene without pigment was tested, time-temperature superposition did not work completely. Further details of this work may be found inBayford (8).
F. R. Young, G. J. Bayford
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Time‐temperature superposition in thermorheologically complex materials

Journal of Polymer Science Part C: Polymer Symposia, 1971
AbstractTwo‐phase polymeric materials such as polymer blends, block copolymers, and graft copolymers, are thermorheologically complex. Mechanical response curves obtained on such materials at different temperatures cannot, in principle, be brought into superposition by a simple shift along the logarithmic time or frequency axis.
D. G. Fesko, N. W. Tschoegl
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Time-temperature superposition principle and scaling behaviour

Journal of Materials Science, 1987
The time-temperature superposition principle, frequently used to describe the mechanical and electrical relaxation behaviour of polymers, is considered within the more general concept of scaling with translation path parallel to the abscissa. The most general functions leading to scaling with translation path parallel to the horizontal axis are given ...
F. Povolo, M. Fontelos
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