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

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

The viscoelastic properties of linear polymers in the state of flow and the transition to the high elastic state. Review

1978 ◽  
Vol 20 (11) ◽  
pp. 2701-2717 ◽  
Author(s):  
G.V. Vinogradov ◽  
Yu.G. Yanovskii ◽  
A.Ya. Malkin ◽  
L.V. Titkova ◽  
V.V. Barancheyeva ◽  
...  
Keyword(s):  
Viscoelastic Properties ◽  
The State ◽  
Linear Polymers ◽  
Elastic State

Viscoelastic Properties of Linear Polymers in the High-Elastic State

1972 ◽  
Vol 45 (4) ◽  
pp. 1015-1032
Author(s):  
G. V. Vinogradov ◽  
E. A. Dzyura ◽  
A. Ya Malkin ◽  
V. A. Grechanovskii
Keyword(s):  
Molecular Weight ◽  
Storage Modulus ◽  
Viscoelastic Properties ◽  
Polymer Chains ◽  
Quantitative Relation ◽  
Linear Polymers ◽  
Elastic State ◽  
Thermomechanical Characteristics ◽  
Time Regime ◽  
Temperature Dependences

Abstract The relation between molecular weight, chain rigidity, and the length of the high-elasticity plateau is determined from frequency and temperature dependences of the storage modulus for polybutadienes and polystyrenes with Mw/Mn≤1.1. Use is made of the concept of equivalence of high-elastic states characterized by equal lengths of high-elastic plateaus for linear polymers. The high-elastic states of the linear polymers studied are equivalent if the polymer chains have equal numbers of dynamic segments and if the reference temperature is T0=1.22Tg, where Tg is the glass transition temperature. The viscoelastic properties of the polymers in the high-elastic state are determined unambiguously by Tg and the molecular weight of the dynamic segment. The quantitative relation between thermomechanical characteristics obtained by measuring deformation versus temperature under a constant time regime and dependence of storage modulus versus frequency under isothermal conditions is discussed.

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%.

A predictive multiscale computational framework for viscoelastic properties of linear polymers

Polymer ◽  
2012 ◽  
Vol 53 (25) ◽  
pp. 5935-5952 ◽  
Author(s):  
Ying Li ◽  
Shan Tang ◽  
Brendan C. Abberton ◽  
Martin Kröger ◽  
Craig Burkhart ◽  
...  
Keyword(s):  
Viscoelastic Properties ◽  
Linear Polymers ◽  
Computational Framework

Viscoelastic Properties of Rubber Networks

1975 ◽  
Vol 48 (5) ◽  
pp. 981-994 ◽  
Author(s):  
P. Thirion
Keyword(s):  
Viscoelastic Properties ◽  
Dynamic Properties ◽  
Mechanical Energy ◽  
Filler Particle ◽  
Polymer Networks ◽  
Relaxation Times ◽  
Low Frequency ◽  
Linear Polymers ◽  
Approach To Equilibrium ◽  
Sinusoidal Vibration

Abstract The molecular theory of Rouse, Zimm, and Bueche correctly accounts for the viscoelastic properties of polymers in very dilute solution and, to a large extent, for those of polymers in bulk or in concentrated solution, as long as their mean molecular weight is below about 20 000. Above this MW limit, relaxation times appear which are longer than those provided for in this theory. The “viscoelastic plateau”, which then appears in the long relaxation time region of the dynamic spectrum, is ascribed to entanglements of molecular chains which behave like temporary crosslinks. An analogous phenomenon occurs in the same way in permanent polymer networks, such as rubber vulcanizates. In this case one finds abnormally slow relaxation or creep rates during the approach to equilibrium, as well as increased low-frequency mechanical energy losses under forced sinusoidal vibration. The presence of colloidal fillers, such as carbon blacks used to reinforce rubbers, also seems to increase this hysteresis within the polymer matrix, independent of thixotropic effects which result from the reversible rupture of filler particle aggregates under large-amplitude cyclic deformations. We propose to analyze here the results (obtained jointly at the Institut Français du Caoutchouc and at the laboratory of Professor J. D. Ferry, University of Wisconsin) of measurements over the entire rubbery spectrum of the dynamic properties and of stress relaxation on vulcanizates of natural rubber, cis-polybutadiene, and styrene-butadiene copolymer (SBR) in the absence of secondary crystallization or aging phenomena. Then we examine the interpretation of the behavior of these materials, both at low frequency and during the approach to equilibrium, by analogy with the theories of the “viscoelastic plateau” of linear polymers.

Transition of polymers from rubbery elastic state to fluid state

2009 ◽  
Vol 4 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Renyuan Qian ◽  
Yansheng Yu
Keyword(s):  
Elastic State ◽  
Fluid State

Effects of polydispersity on relaxation mechanisms and viscoelastic properties of entangled linear polymers

1988 ◽  
Vol 21 (11) ◽  
pp. 3171-3178 ◽  
Author(s):  
Kwang Sik Choi ◽  
In Jae Chung ◽  
Hee Young Kim
Keyword(s):  
Viscoelastic Properties ◽  
Linear Polymers
Sign in / Sign up

Export Citation Format

Share Document