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.

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

Branching in Polymer Chains

1972 ◽  
Vol 45 (3) ◽  
pp. 519-545 ◽  
Author(s):  
V. A. Grechanovskii
Keyword(s):  
Molecular Weight ◽  
Breaking Strength ◽  
Strength Properties ◽  
Polymer Chains ◽  
Branched Polymers ◽  
Shear Stresses ◽  
Linear Polymers ◽  
Concentrated Solutions ◽  
Active Centers ◽  
Lower Viscosity

Abstract The branching that occurs in molecular chains leads to extensive changes of the physico-mechanical and technological properties of various polymers, as compared with the corresponding linear polymers. For example, branched divinylstyrene rubbers, polybutadienes, and other branched elastomers possess a low elasticity, breaking strength, etc. The decrease of strength properties and the change of the dynamic and mechanical properties with the increase of the degree of branching is characteristic for such thermoplastic polymers as polystyrene, polyethylene, polyvinyl chloride, etc. There also exist considerable differences in the rheological properties of linear and branched polymers. For example, at low loads (shear stresses) linear polymers and their melts flow like newtonian fluids and possess a lower viscosity as compared with branched polymers, whereas at high loads the character of flow deviates from that of a newtonian flow, so that the viscosity of a branched polymer is lower than that of a linear polymer or almost equal. Similar regularities have also been observed for concentrated solutions. Hence, the branching, together with the regularity of the structure of polymer chains, the molecular weight, and the molecular weight distribution, represents one of the most important molecular parameters of polymers. The branching occurs during polymerization and is caused essentially by a transfer of active centers to the polymer chain.

Viscoelastic Properties of Linear Polymers with High Molecular Weights and Sharp Molecular Weight Distributions

1978 ◽  
Vol 11 (5) ◽  
pp. 888-893 ◽  
Author(s):  
Yoshinobu Isono ◽  
Teruo Fujimoto ◽  
Naoki Takeno ◽  
Hirokazu Kajiura ◽  
Mitsuru Nagasawa
Keyword(s):  
Molecular Weight ◽  
Viscoelastic Properties ◽  
Linear Polymers ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
Weight Distributions

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

Peculiarities of flow and viscoelastic properties of solutions of polymers with a narrow molecular-weight distribution

1973 ◽  
Vol 9 (11) ◽  
pp. 1231-1249 ◽  
Author(s):  
G.V. Vinogradov ◽  
A.Ya. Malkin ◽  
N.K. Blinova ◽  
S.I. Sergeyenkov ◽  
M.P. Zabugina ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Viscoelastic Properties ◽  
Narrow Molecular Weight Distribution

Processability predictions for mechanically recycled blends of linear polymers

2020 ◽  
Vol 40 (9) ◽  
pp. 771-781
Author(s):  
Janne van Gisbergen ◽  
Jaap den Doelder
Keyword(s):  
Molecular Weight ◽  
Circular Economy ◽  
Melt Flow Index ◽  
Building Blocks ◽  
Experimental Designs ◽  
New Method ◽  
Flow Index ◽  
Linear Polymers ◽  
Combined Method

AbstractRecycling of thermoplastic polymers is an important element of sustainable circular economy practices. The quality of mechanically recycled polymers is a concern. A method is presented to predict the structure and processability of recycled blends of polymers based on processability knowledge of their virgin precursor components. Blending rules at molecular weight distribution level are well established and form the foundation of the new method. Two essential fundamental building blocks are combined with this foundation. First, component and blend structure are related to viscosity via tube theories. Second, viscosity is related to melt flow index via a continuum mechanics approach. Emulator equations are built based on virtual experimental designs for fast forward and reverse calculations directly relating structure to viscosity and processability. The new combined method is compared with empirical blend rules, and shows important similarities and also clear quantitative differences. Finally, the new method is applied to practical recycling quality challenges.

Sign in / Sign up

Export Citation Format

Share Document