Results 281 to 290 of about 192,349 (315)
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Time‐temperature superposition of the fundamental relaxation processes of polyethylene
Journal of Polymer Science: Polymer Symposia, 1974AbstractThe application of Tobolsky's time‐temperature superposition principle for the stress‐relaxation behavior of amorphous polymers is reviewed, and its extension to crystalline polymers and the employment of X‐ray and optical methods is discussed.
Richard S. Stein +3 more
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Time-Temperature Superposition in Two-Phase Polyblends
1974The temperature dependence of the mechanical properties of a 50/50 blend of PVAC and lightly crosslinked PMMA has been examined using the data of Kawai et al. The shift distances, log aT, were generated by bringing the experimental data into coincidence on master curves calculated from a Takayanagi model whose parameters were varied in different ...
D. Kaplan, N. W. Tschoegl
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Time-Temperature Superposition in Linear and Non-linear Domain
Materials Today: Proceedings, 2016Long-term behavior of polymers and their composites is related mainly to their time-dependent mechanical properties, i.e. material functions or master curves, usually obtained by time-temperature superposition (tTS) principle. The “weakest” point utilizing tTS lies in “manual or hand” shifting procedure, which can lead to over- or under-estimated life ...
Marina Gergesova +3 more
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General function with scaling properties and the time-temperature superposition
Il Nuovo Cimento D, 1991The most general function with scaling properties, that is, with superposition properties along a given direction, is deduced from the general solution of the partial differential equation that describes the scaling conditions. The time-temperature superposition, which means a scaling behaviour with a translation path parallel to the abscissa, is ...
M. Fontelos, F. Povolo
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Time‐temperature superposition and physical aging in amorphous polymers
Polymer Engineering & Science, 1988AbstractIn the past, time‐temperature superposition has been used to extend the time scale of creep tests in polymers from the short times easily obtained in the laboratory to long times seen in actual use. A fundamental assumption of time‐temperature superposition is, however, that the polymer does not change in structure as a function of time ...
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Time-temperature superposition and relaxational behavior in polymeric glasses
Journal of Macromolecular Science, Part B, 1968It is shown that a free-volume treatment of the relaxational behavior of a polymer can be extended into the glassy region.
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Breakdown of time-temperature superposition in miscible polymer blends
Polymer, 1989Abstract The empirical principle of time-temperature superposition has been found to fail for a miscible blend of 20 weight% poly(ethylene oxide) in poly(methyl methacrylate). Oscillatory shear rheometry data is reported for this blend at four temperatures well above the glass transition temperature of the blend.
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Time‐temperature superposition for polypropylene
Journal of Polymer Science Part B: Polymer Letters, 1964R. Meredith, R. C. Laible
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On the Time‐Temperature Superposition Principle of Dilute Polymer Liquids
Journal of Rheology, 1979In this work, a simple bead‐spring (dumbbell) model is employed together with the Langevin analysis to show that the master curves for stress must be made in terms of the group S/ρT, and S is the stress tensor, T the absolute temperature, and ρ the density of the solvent.
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Superposition‐based concurrent multiscale approaches for poromechanics
International Journal for Numerical Methods in Engineering, 2021Jacob Fish, Pengpeng Ni, Wei Sun
exaly