Branched Polymers under Shear

Nikoubashman, Arash; Likos, Christos N.

doi:10.1021/ma902212s

Cited by 39 publications

(39 citation statements)

References 46 publications

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“…Increased flow resistance at high frequency could be caused by flow instabilities and turbulences 38. While the angular frequency increases over time, the macromolecules interact and recoil more and more, and as a consequence the viscosity of the solution increases again 13, 21, 38, 39…”

Section: Resultsmentioning

confidence: 99%

“…Due to the ability of preparing brushes with a wide range of molecular characteristics, and with well‐defined compositions, architecture and functionality, these materials demonstrate the potential utility of macromolecular engineering for preparing new advanced materials 8. It is therefore important to understand the fundamental structure–property relationships inherent to molecular brushes 10, 13–16…”

Section: Introductionmentioning

confidence: 99%

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Novel Glycopolymer Brushes via ATRP: 2. Thermal and Mechanical Properties

Fleet

Dungen

Klumperman

2011

Macro Chemistry & Physics

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The thermal and mechanical properties of a series of novel glycopolymer brushes with various degrees of polymerization of the backbone and various grafting densities are established. Modulated differential scanning calorimetry (MDSC) is found to be an effective tool for the characterization of the thermal behavior of these glycopoly mer brushes. There is little difference among the glass transition temperatures of the different glycopolymer brushes. The elastic features of each glycopolymer predominate ( G ′ > G ″ ) at low frequency, while at higher frequencies the G ″ curve overtakes the G ′ curve, indicating the predominance of the viscous response.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Glycopolymer Brushes via ATRP: 2. Thermal and Mechanical Properties

Fleet

Dungen

Klumperman

2011

Macro Chemistry & Physics

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“…[38][39][40][41][42][43] The ring polymer chains consist of N beads of mass M each. [38][39][40][41][42][43] The ring polymer chains consist of N beads of mass M each.…”

Section: Model and Simulation Methodsmentioning

confidence: 99%

Effects of excluded volume and hydrodynamic interaction on the deformation, orientation and motion of ring polymers in shear flow

et al. 2015

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A ring polymer is a classical model to explore the behaviors of biomacromolecules. Compared with its linear counterpart in shear flow, the ring polymer should be more sensitive to excluded volume and hydrodynamic interaction attributed to the absence of chain ends. We carried out multiparticle collision dynamics combined with molecular dynamics simulation to study the effects of excluded volume and hydrodynamic interaction on the behaviors of ring polymers in shear flow. The results show that in the absence of the strong excluded volume interaction, the ring polymer prefers a two-strand linear conformation with high deformation and orientation in the flow-gradient plane, and the tank-treading motion is nearly negligible. Ring polymers without excluded volume show no significant difference from linear polymers in the scaling exponents for the deformation, orientation and tumbling motion. We also observed that the hydrodynamic interaction could efficiently slow down the relaxation of ring polymers while the scaling exponents against the Weissenberg number have rarely been affected.

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“…To date there has been a considerable amount of work on the response of flexible polymers with different architectures (e.g., linear, ring, hyperbranched and star polymers) to shear stress, which has revealed generic and specific properties of such systems. On top of experimental techniques, the development of simulation methods allowing to efficiently couple the solvent particles and monomers, a wide spectrum of behaviors has been found regarding the average deformation and the orientation as a function of the shear rate, as well as, multiple dynamic responses [3][4][5][6][7][8]. The latter encompass stretching and recoil, tumbling, tank-treading, rupture, and collapse of polymers and ultimately determine the (complex) viscoelastic response of dilute bulk phases.…”

Section: Introductionmentioning

confidence: 99%

Rotation Dynamics of Star Block Copolymers under Shear Flow

Jaramillo-Cano

Likos

Camargo

2018

Preprint

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Star block-copolymers (SBCs) are macromolecules formed by a number of diblock copolymers anchored to a common central core, being the internal monomers solvophilic and the end monomers solvophobic. Recent studies have demonstrated that SBCs constitute a self-assembling building blocks with specific softness, functionalization, shape, and flexibility. Depending on different physical and chemical parameters the SBCs can behave as flexible patchy particles. In this paper, we study the rotational dynamics of isolated SBCs using a hybrid mesoscale simulation technique. We compare three different approaches to analyse the dynamics: the laboratory frame, the non-inertial Eckart's frame, and a geometrical approximation relating the conformation of the SBC to the velocity profile of the solvent. We find that the geometrical approach is adequate when dealing with very soft systems while in the opposite extreme, the dynamics is best explained using the laboratory frame. On the other hand, the Eckart frame is found to be very general and to reproduced well both extreme cases. We also compare the rotational frequency and the kinetic energy with the definitions of the angular momentum and inertia tensor different from recent publications.

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Branched Polymers under Shear

Cited by 39 publications

References 46 publications

Novel Glycopolymer Brushes via ATRP: 2. Thermal and Mechanical Properties

Novel Glycopolymer Brushes via ATRP: 2. Thermal and Mechanical Properties

Effects of excluded volume and hydrodynamic interaction on the deformation, orientation and motion of ring polymers in shear flow

Rotation Dynamics of Star Block Copolymers under Shear Flow

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