scholarly journals Effects of chain length on Rouse modes and non-Gaussianity in linear and ring polymer melts

2021 ◽  
Vol 155 (12) ◽  
pp. 124901
Author(s):  
Shota Goto ◽  
Kang Kim ◽  
Nobuyuki Matubayasi
Keyword(s):  
Chain Length ◽  
Polymer Melts ◽  
Ring Polymer

Lattice self-consistent field calculations of ring polymer brushes

Soft Matter ◽  
2018 ◽  
Vol 14 (10) ◽  
pp. 1887-1896 ◽  
Author(s):  
Wenjuan Qiu ◽  
Baohui Li ◽  
Qiang Wang
Keyword(s):  
Chain Length ◽  
Polymer Brushes ◽  
Grafting Density ◽  
Consistent Field ◽  
Equivalent Linear ◽  
Self Consistent ◽  
Self Consistent Field ◽  
Ring Polymer

Ring brushes are slightly less stretched than, thus nearly but not completely identical to, the “equivalent” linear brushes having half the chain length and double the grafting density.

scholarly journals Slow Dynamics of Ring Polymer Melts by Asymmetric Interaction of Threading Configuration: Monte Carlo Study of a Dynamically Constrained Lattice Model

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 516 ◽  
Author(s):  
Eunsang Lee ◽  
YounJoon Jung
Keyword(s):  
Monte Carlo ◽  
Internal Structure ◽  
Lattice Model ◽  
Polymer Melts ◽  
Field Analysis ◽  
Einstein Relation ◽  
Slow Dynamics ◽  
Tree Model ◽  
Structure Relaxation ◽  
Ring Polymer

Abnormally slower diffusional processes than its internal structure relaxation have been observed in ring polymeric melt systems recently. A key structural feature in ring polymer melts is topological constraints which allow rings to assume a threading configuration in the melt phase. In this work, we constructed a lattice model under the assumption of asymmetric diffusivity between two threading rings, and investigated a link between the structural correlation and its dynamic behavior via Monte Carlo simulations. We discovered that the hierarchical threading configurations render the whole system to exhibit abnormally slow dynamics. By analyzing statistical distributions of timescales of threading configurations, we found that the decoupling between internal structure relaxation and diffusion is crucial to understand the threading effects on the dynamics of a ring melt. In particular, in the limit of small but threaded rings, scaling exponents of the diffusion coefficient D and timescale τ diff with respect to the degree of polymerization N agree well with that of the annealed tree model as well as our mean-field analysis. As N increases, however, the ring diffusion abruptly slows down to the glassy behavior, which is supported by a breakdown of the Stokes–Einstein relation.

Effects of chain stiffness and shear flow on nanoparticle dispersion and distribution in ring polymer melts

2020 ◽  
Vol 21 (3) ◽  
pp. 229-239
Author(s):  
Dan Wang ◽  
Feng-qing Li ◽  
Xiang-hong Wang ◽  
Shi-ben Li ◽  
Lin-li He
Keyword(s):  
Shear Flow ◽  
Polymer Melts ◽  
Nanoparticle Dispersion ◽  
Chain Stiffness ◽  
Ring Polymer

scholarly journals Segregated structures of ring polymer melts near the surface: a molecular dynamics simulation study

Soft Matter ◽  
2015 ◽  
Vol 11 (30) ◽  
pp. 6018-6028 ◽  
Author(s):  
Eunsang Lee ◽  
YounJoon Jung
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Simulation Study ◽  
Polymer Melts ◽  
Dynamics Simulation ◽  
Ring Polymer ◽  
Segregated Structure

A ring polymer in a melt under confinement shows a very compact and segregated structure.

scholarly journals Simulation of ring polymer melts with GPU acceleration

2018 ◽  
Vol 363 ◽  
pp. 128-139 ◽  
Author(s):  
R.D. Schram ◽  
G.T. Barkema
Keyword(s):  
Polymer Melts ◽  
Gpu Acceleration ◽  
Ring Polymer

scholarly journals Influence of knot complexity on glass-formation in low molecular mass ring polymer melts

2019 ◽  
Vol 150 (10) ◽  
pp. 101103 ◽  
Author(s):  
Fernando Vargas-Lara ◽  
Beatriz A. Pazmiño Betancourt ◽  
Jack F. Douglas
Keyword(s):  
Molecular Mass ◽  
Glass Formation ◽  
Polymer Melts ◽  
Ring Polymer

scholarly journals Viscosity of Ring Polymer Melts

2013 ◽  
Vol 2 (10) ◽  
pp. 874-878 ◽  
Author(s):  
Rossana Pasquino ◽  
Thodoris C. Vasilakopoulos ◽  
Youn Cheol Jeong ◽  
Hyojoon Lee ◽  
Simon Rogers ◽  
...  
Keyword(s):  
Polymer Melts ◽  
Ring Polymer

DEVELOPMENTS TOWARD SIMULATION OF ENTANGLED POLYMER MELTS BY DISSIPATIVE PARTICLE DYNAMICS (DPD)

2003 ◽  
Vol 17 (01n02) ◽  
pp. 231-235 ◽  
Author(s):  
GUOAI PAN ◽  
CHARLES W. MANKE
Keyword(s):  
Diffusion Coefficient ◽  
Chain Length ◽  
Polymer Melts ◽  
Center Of Mass ◽  
Dissipative Particle Dynamics ◽  
Scaling Exponent ◽  
Chain Segment ◽  
Entangled Polymer ◽  
Entangled Polymer Melts ◽  
Chain Lengths

A segmental repulsion force is developed to reduce the frequency of artificial chain segment crossing events in DPD simulations of the dynamics of polymer melts. The scaling of viscosity and center of mass diffusion coefficients with chain length show transitions in scaling exponents at a critical entanglement chain length. Above the entanglement chain length, the scaling exponent for the diffusion coefficient is close to the experimental value of -2, but the scaling exponent for viscosity is close to +2, which is smaller than the experimental value of +3.4. Without segmental repulsion forces, chain segment crossings occur freely, and the scaling of both diffusion coefficient and viscosity follow the Rouse model for all chain lengths.

Molecular dynamics study on the structure and relaxation of short-chain branched ring polymer melts

Polymer ◽  
2019 ◽  
Vol 175 ◽  
pp. 107-117 ◽  
Author(s):  
Eun Jung Roh ◽  
Jun Mo Kim ◽  
Chunggi Baig
Keyword(s):  
Molecular Dynamics ◽  
Polymer Melts ◽  
Short Chain ◽  
Ring Polymer
Sign in / Sign up

Export Citation Format

Share Document