scholarly journals The role of stickiness in the rheology of semiflexible polymers

Soft Matter ◽  
2019 ◽  
Vol 15 (24) ◽  
pp. 4865-4872 ◽  
Author(s):  
Tom Golde ◽  
Martin Glaser ◽  
Cary Tutmarc ◽  
Iman Elbalasy ◽  
Constantin Huster ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Polymer Networks ◽  
Semiflexible Polymers ◽  
Semiflexible Polymer

The rheological properties of semiflexible polymer networks are strongly affected by a polymer specific stickiness.

scholarly journals A science friction story – Molecular interactions in semiflexible polymer networks

2021 ◽  
Author(s):  
Paul Mollenkopf ◽  
Dusan Prascevic ◽  
Martin Glaser ◽  
David M. Smith ◽  
Jörg Schnauß
Keyword(s):  
Molecular Interactions ◽  
Mechanical Response ◽  
Polymer Networks ◽  
Intermediate Frequency ◽  
Model Systems ◽  
Semiflexible Polymers ◽  
Friction Forces ◽  
Semiflexible Polymer ◽  
Frequency Regime ◽  
Nonlinear Deformations

AbstractEstablished model theories, developed to capture the mechanical behavior of soft complex materials composed of semiflexible polymers assume entropic interactions between filaments to determine the mechanical response. In recent studies, the general accepted tube model has been challenged in terms of its basic assumption about filament-filament interactions, but also because of its predictions regarding the frequency dependence of the elastic modulus in the intermediate frequency regime. A central question is how molecular interactions and friction between network constituents influence the rheological response of isotropic entangled networks of semiflexible polymers. It was shown that friction forces between aligned pairs of actin filaments are not negligible. Here, we systematically investigate the influence of friction forces and attractive interactions on network rheology by means of a targeted surface modification. We show that these forces have a qualitative and quantitative influence on the viscoelastic properties of semiflexible polymer networks and contribute to the response to nonlinear deformations. By comparing two polymer model systems with respect to their surface compositions we give a possible explanation about the origin of acting forces on a molecular level.

The role of structure in the nonlinear mechanics of cross-linked semiflexible polymer networks

2012 ◽  
Vol 136 (6) ◽  
pp. 065101 ◽  
Author(s):  
Nicholas Agung Kurniawan ◽  
Søren Enemark ◽  
Raj Rajagopalan
Keyword(s):  
Polymer Networks ◽  
Nonlinear Mechanics ◽  
Semiflexible Polymer

scholarly journals Increasing valence pushes DNA nanostar networks to the isostatic point

2019 ◽  
Vol 116 (15) ◽  
pp. 7238-7243 ◽  
Author(s):  
Nathaniel Conrad ◽  
Tynan Kennedy ◽  
Deborah K. Fygenson ◽  
Omar A. Saleh
Keyword(s):  
Shear Modulus ◽  
Strain Hardening ◽  
Polymer Networks ◽  
Plateau Modulus ◽  
Entropic Elasticity ◽  
Semiflexible Polymer ◽  
Rubber Model ◽  
Series Of Experiments ◽  
Nonlinear Elastic

The classic picture of soft material mechanics is that of rubber elasticity, in which material modulus is related to the entropic elasticity of flexible polymeric linkers. The rubber model, however, largely ignores the role of valence (i.e., the number of network chains emanating from a junction). Recent work predicts that valence, and particularly the Maxwell isostatic point, plays a key role in determining the mechanics of semiflexible polymer networks. Here, we report a series of experiments confirming the prominent role of valence in determining the mechanics of a model system. The system is based on DNA nanostars (DNAns): multiarmed, self-assembled nanostructures that form thermoreversible equilibrium gels through base pair-controlled cross-linking. We measure the linear and nonlinear elastic properties of these gels as a function of DNAns arm number, f, and concentration [DNAns]. We find that, as f increases from three to six, the gel’s high-frequency plateau modulus strongly increases, and its dependence on [DNAns] transitions from nonlinear to linear. Additionally, higher-valence gels exhibit less strain hardening, indicating that they have less configurational freedom. Minimal strain hardening and linear dependence of shear modulus on concentration at high f are consistent with predictions for isostatic systems. Evident strain hardening and nonlinear concentration dependence of shear modulus suggest that the low-f networks are subisostatic and have a transient, potentially fractal percolated structure. Overall, our observations indicate that network elasticity is sensitive both to entropic elasticity of network chains and to junction valence, with an apparent isostatic point 5<fc≤6 in agreement with the Maxwell prediction.

Exploring secondary interactions and the role of temperature in moisture-contaminated polymer networks through molecular simulations

Soft Matter ◽  
2021 ◽  
Vol 17 (10) ◽  
pp. 2942-2956
Author(s):  
Rishabh D. Guha ◽  
Ogheneovo Idolor ◽  
Katherine Berkowitz ◽  
Melissa Pasquinelli ◽  
Landon R. Grace
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Temperature Variation ◽  
Polymer Networks ◽  
Molecular Simulations ◽  
Effect Of Temperature ◽  
Secondary Interactions ◽  
Dynamics Simulations ◽  
Secondary Bonding

We investigated the effect of temperature variation on the secondary bonding interactions between absorbed moisture and epoxies with different morphologies using molecular dynamics simulations.

Role of Additives in Enhancing the Rheological Properties of Magnetorheological Solids: A Review

2018 ◽  
Vol 21 (3) ◽  
pp. 1800696 ◽  
Author(s):  
Muntaz Hana Ahmad Khairi ◽  
Saiful Amri Mazlan ◽  
Ubaidillah   ◽  
Seung‐Bok Choi ◽  
Siti Aishah Abdul Aziz ◽  
...  
Keyword(s):  
Rheological Properties
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