Viscoelastic properties of amorphous polymers in the rubberlike elastic state as a function of the nature and length of the polymer chain

1970 ◽  
Vol 18 (6) ◽  
pp. 659-668
Author(s):  
G. V. Vinogradov ◽  
E. A. Dzyura ◽  
A. Ya. Malkin
Keyword(s):  
Polymer Chain ◽  
Viscoelastic Properties ◽  
Amorphous Polymers ◽  
Elastic State

Identification of Different Modes of Molecular Motion in Polymers That Cause Thermorheological Complexity

1995 ◽  
Vol 68 (3) ◽  
pp. 376-434 ◽  
Author(s):  
K. L. Ngai ◽  
D. J. Plazek
Keyword(s):  
Temperature Dependence ◽  
Polymer Chain ◽  
Viscoelastic Properties ◽  
Amorphous Polymers ◽  
Glass Temperature ◽  
Segmental Motion ◽  
Coupling Theory ◽  
Theoretical Understanding ◽  
Chain Dynamics ◽  
The Many

Abstract The viscoelastic properties of amorphous polymers are reviewed with emphasis on the glass to rubber dispersion (often referred to as the transition zone). Deviations from thermorheologieal simplicity (where molecular retardation and relaxation mechanisms have the same temperature dependence) are identified. Most theories and models of polymer chain dynamics do not address or acknowledge thermorheological complexities and correlations, such as that between the temperature dependence and the breadth of viscoelastic and dielectric dispersions of the local segmental motion. Without successful theories of these phenomena the understanding of polymer chain dynamics must be considered incomplete. In this review, old and new experimental data are used to identify the different modes of molecular motions and the domains of their contributions to the time and frequency dependence of the mechanical response of amorphous polymers. The different modes are then shown generally to have their own dependence on temperature. Thus the viscoelastic spectrum, including local segmental motions which dominate the onset of glassy behavior and largely determine the glass temperature, Tg, the glass to rubber softening dispersion, the rubbery plateau and the terminal zone, is thermorheologically complex. A coupling theory, with the physics of intermolecular interactions and cooperativity built into it, describes well the many-body dynamics of densely packed molecular systems such as polymers. The many predictions of the coupling theory are applied to the different viscoeleatic modes to explain the observed anomalous experimental facts and established correlations. The theoretical understanding has been improved to the extent that now a connection can be made between the chemical structure of the monomer and the viscoelastic properties of the polymer.

scholarly journals Термомеханический анализ эффекта памяти формы полиуретанового композита, используемого для создания развертываемых конструкций космического назначения

2019 ◽  
Vol 45 (9) ◽  
pp. 32
Author(s):  
Т.А. Шалыгина ◽  
С.Ю. Воронина ◽  
А.Ю. Власов ◽  
К.А. Пасечник ◽  
И.В. Обверткин
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Recovery Rate ◽  
Viscoelastic Properties ◽  
Original Form ◽  
Elastic State ◽  
Three Point Bending ◽  
Polyurethane Composite

The possibility of using a three-point bending clamp thermomechanical analyzer for study the shape memory effect of a constructional polyurethane composite is investigated. The viscoelastic properties of the sample in the region of the transition from the glassy to the highly elastic state are studied. The parameters affecting the recovery rate of the original form (Rr) and the fixation factor of the temporary form (Rf) are determined. The conditions for deforming and cooling the polyurethane composite are established, which allow to achieve the values of Rr = 99.98% and Rf = 99.70%.

Viscoelastic properties of amorphous polymers 3: low molecular weight poly(methylphenylsiloxane)

1994 ◽  
Vol 272 (11) ◽  
pp. 1430-1438 ◽  
Author(s):  
D. J. Plazek ◽  
C. A. Bero ◽  
S. Neumeister ◽  
G. Floudas ◽  
G. Fytas ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Viscoelastic Properties ◽  
Amorphous Polymers ◽  
Low Molecular Weight

Viscoelastic properties of linear polymers in the high-elastic state

1971 ◽  
Vol 9 (7) ◽  
pp. 1153-1171 ◽  
Author(s):  
G. V. Vinogradov ◽  
E. A. Dzyura ◽  
A. Ya. Malkin ◽  
V. A. Grechanovski??
Keyword(s):  
Viscoelastic Properties ◽  
Linear Polymers ◽  
Elastic State

Viscoelastic properties of linear polymers in the fluid state and their transition to the high-elastic state

1980 ◽  
Vol 20 (17) ◽  
pp. 1138-1146 ◽  
Author(s):  
G. V. Vinogradov ◽  
Yu. G. Yanovsky ◽  
L. V. Titkova ◽  
V. V. Barancheeva ◽  
S. I. Sergeenkov ◽  
...  
Keyword(s):  
Viscoelastic Properties ◽  
Linear Polymers ◽  
Elastic State ◽  
Fluid State
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