Dynamics of entangled polymers subjected to reptation and drift

Soft Matter ◽  
2020 ◽  
Vol 16 (12) ◽  
pp. 3154-3168
Author(s):  
Andrés R. Tejedor ◽  
Jorge Ramírez
Keyword(s):  
Transport Properties ◽  
Linear Polymers ◽  
Entangled Polymers

Reptating linear polymers with drift give rise to enhanced transport properties.

scholarly journals Comparative Analysis of Different Tube Models for Linear Rheology of Monodisperse Linear Entangled Polymers

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 754 ◽  
Author(s):  
Volha Shchetnikava ◽  
Johan Slot ◽  
Evelyne van Ruymbeke
Keyword(s):  
Experimental Data ◽  
Comparative Analysis ◽  
Hierarchical Model ◽  
Linear Viscoelasticity ◽  
Star Polymers ◽  
Contour Length ◽  
Large Set ◽  
Linear Polymers ◽  
Entangled Polymers ◽  
Constraint Release

The aim of the present paper is to analyse the differences between tube-based models which are widely used for predicting the linear viscoelasticity of monodisperse linear polymers, in comparison to a large set of experimental data. The following models are examined: Milner–McLeish, Likhtman–McLeish, the Hierarchical model proposed by the group of Larson, the BoB model of Das and Read, and the TMA model proposed by the group of van Ruymbeke. This comparison allows us to highlight and discuss important questions related to the relaxation of entangled polymers, such as the importance of the contour-length fluctuations (CLF) process and how it affects the reptation mechanism, or the contribution of the constraint release (CR) process on the motion of the chains. In particular, it allows us to point out important approximations, inherent in some models, which result in an overestimation of the effect of CLF on the reptation time. On the contrary, by validating the TMA model against experimental data, we show that this effect is underestimated in TMA. Therefore, in order to obtain accurate predictions, a novel modification to the TMA model is proposed. Our current work is a continuation of earlier research (Shchetnikava et al., 2014), where a similar analysis is performed on well-defined star polymers.

Do Transport Properties of Entangled Linear Polymers Scale with Excess Entropy?

2013 ◽  
Vol 46 (21) ◽  
pp. 8710-8723 ◽  
Author(s):  
Evangelos Voyiatzis ◽  
Florian Müller-Plathe ◽  
Michael C. Böhm
Keyword(s):  
Transport Properties ◽  
Excess Entropy ◽  
Linear Polymers

Spectroscopic Diagnostics of Tokamaks

1988 ◽  
Vol 102 ◽  
pp. 165-174
Author(s):  
C. de Michelis
Keyword(s):  
Transport Properties ◽  
Power Losses ◽  
Spectroscopic Diagnostics ◽  
Important Concern

AbstractImpurities being an important concern in tokamaks, spectroscopy plays a key role in their understanding. Techniques for the evaluation of concentrations, power losses and transport properties are surveyed, and a few developments are outlined.

Structure and Orientation of As Precipitates in LT-MBE Grown GaAs

1991 ◽  
Vol 49 ◽  
pp. 900-901 ◽  
Author(s):  
Alain Claverie ◽  
Zuzanna Liliental-Weber
Keyword(s):  
Transport Properties ◽  
Layer Thickness ◽  
Growth Temperature ◽  
Low Temperatures ◽  
Lattice Parameter ◽  
Crystalline Quality ◽  
Insulating Properties ◽  
Lt Gaas

GaAs layers grown by MBE at low temperatures (in the 200°C range, LT-GaAs) have been reported to have very interesting electronic and transport properties. Previous studies have shown that, before annealing, the crystalline quality of the layers is related to the growth temperature. Lowering the temperature or increasing the layer thickness generally results in some columnar polycrystalline growth. For the best “temperature-thickness” combinations, the layers may be very As rich (up to 1.25%) resulting in an up to 0.15% increase of the lattice parameter, consistent with the excess As. Only after annealing are the technologically important semi-insulating properties of these layers observed. When annealed in As atmosphere at about 600°C a decrease of the lattice parameter to the substrate value is observed. TEM studies show formation of precipitates which are supposed to be As related since the average As concentration remains almost unchanged upon annealing.

Modification of structural and transport properties in epitaxial YBa2CU3Ox films by pulsed laser irradiation

1993 ◽  
Vol 3 (12) ◽  
pp. 2173-2188
Author(s):  
N. G. Chechenin ◽  
A. V. Chernysh ◽  
V. V. Korneev ◽  
E. V. Monakhov ◽  
B. V. Seleznev
Keyword(s):  
Transport Properties ◽  
Laser Irradiation ◽  
Pulsed Laser ◽  
Pulsed Laser Irradiation

Transport properties of Ni81.5B18.5 - YP y amorphous alloys

1989 ◽  
Vol 50 (21) ◽  
pp. 3233-3242 ◽  
Author(s):  
M. Očko ◽  
E. Babić
Keyword(s):  
Transport Properties ◽  
Amorphous Alloys

Transport properties of evaporated versus sputtered amorphous germanium films

1980 ◽  
Vol 41 (10) ◽  
pp. 1173-1181 ◽  
Author(s):  
M.-L. Theye ◽  
A. Gheorghiu ◽  
T. Rappeneau ◽  
A. Lewis
Keyword(s):  
Transport Properties ◽  
Amorphous Germanium ◽  
Germanium Films

On the surface tension of directed linear polymers

1989 ◽  
Vol 50 (6) ◽  
pp. 599-608 ◽  
Author(s):  
V.B. Priezzhev ◽  
S.A. Terletsky
Keyword(s):  
Surface Tension ◽  
Linear Polymers
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