Conformation of Free Linear Polymer Chains in a Polymer Network

1997 ◽  
Vol 30 (16) ◽  
pp. 4704-4712 ◽  
Author(s):  
Xiaodu Liu ◽  
Barry J. Bauer ◽  
Robert M. Briber
Keyword(s):  
Polymer Network ◽  
Polymer Chains ◽  
Linear Polymer

Chemiluminescent self-reported unfolding of single-chain nanoparticles

2021 ◽  
Author(s):  
Fabian R. Bloesser ◽  
Sarah L. Walden ◽  
Ishrath M. Irshadeen ◽  
Lewis C. Chambers ◽  
Christopher Barner-Kowollik
Keyword(s):  
Polymer Chains ◽  
Linear Polymer ◽  
Single Chain

We demonstrate the light-induced, crosslinker mediated collapse of linear polymer chains into single-chain nanoparticles (SCNPs) capable of self-reporting their unfolding.

Pulses of Fast Electrons as a Tool To Synthesize Poly(acrylic acid) Nanogels. Intramolecular Cross-Linking of Linear Polymer Chains in Additive-Free Aqueous Solution

2003 ◽  
Vol 36 (7) ◽  
pp. 2484-2492 ◽  
Author(s):  
Slawomir Kadlubowski ◽  
Jaroslaw Grobelny ◽  
Wielislaw Olejniczak ◽  
Michal Cichomski ◽  
Piotr Ulanski
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Polymer Chains ◽  
Linear Polymer ◽  
Cross Linking ◽  
Fast Electrons ◽  
Poly Acrylic Acid

scholarly journals Polymer gel with a flexible and highly ordered three-dimensional network synthesized via bond percolation

2019 ◽  
Vol 5 (12) ◽  
pp. eaax8647 ◽  
Author(s):  
X. Li ◽  
S. Nakagawa ◽  
Y. Tsuji ◽  
N. Watanabe ◽  
M. Shibayama
Keyword(s):  
Network Formation ◽  
General Scheme ◽  
Polymer Network ◽  
Three Dimensional ◽  
Geometric Constraints ◽  
Polymer Chains ◽  
Bond Percolation ◽  
Polymer Gel ◽  
Temporal Correlations ◽  
Before And After

Gels are a soft elastic material consisting of a three-dimensional polymer network with nanometer-sized pores and are used in a variety of applications. However, gel networks typically have a substantial level of defects because the network formation reaction proceeds stochastically. In this study, we present a general scheme to fabricate gels with extremely low levels of defects by applying geometric constraints into pregel solution based on the “bond percolation” concept. In the formed gel, stationary laser speckles, which are an indicator of spatial defects, were not observed at all. In addition, we found that the concentration fluctuations of the polymer chains were ergodic across the whole gel network. In such a homogeneous gel, both the spatial and temporal correlations of polymer chains are the same before and after gelation.

Star/Linear Polymer Topology Transformation Facilitated by Mechanical Linking of Polymer Chains

2015 ◽  
Vol 54 (23) ◽  
pp. 6770-6774 ◽  
Author(s):  
Daisuke Aoki ◽  
Satoshi Uchida ◽  
Toshikazu Takata
Keyword(s):  
Polymer Chains ◽  
Linear Polymer ◽  
Polymer Topology

Pseudoelasticity and Nonideal Mullins Effect of Nanocomposite Hydrogels

2016 ◽  
Vol 83 (11) ◽  
Author(s):  
Jingda Tang ◽  
Xing Chen ◽  
Yongmao Pei ◽  
Daining Fang
Keyword(s):  
Polymer Network ◽  
Residual Deformation ◽  
Polymer Chains ◽  
Residual Fraction ◽  
Mullins Effect ◽  
Nanocomposite Hydrogels ◽  
High Toughness ◽  
Physically Crosslinked ◽  
Two Parameters ◽  
The Ideal

The polymer network of a nanocomposite (NC) hydrogel is physically crosslinked by nanoclay. Recently reported high toughness of nanocomposite (NC) hydrogels highlights the importance of their dissipative properties. The desorption of polymer chains from clay surface may contribute mostly to the hysteresis of NC hydrogels. Here, we proposed a mechanistically motivated pseudoelastic model capable of characterizing the hysteresis of NC hydrogels. The two parameters in the proposed damage variable can be determined by the experiments. We applied the model to the uniaxial tension and reproduced the ideal Mullins effect of NC hydrogels. Furthermore, we considered two nonideal effects: residual deformation and nonideal reloading in multicycle test, using newly proposed damage parameters. A power law with the order of 1/3 is established between the residual fraction of the stretch and the re-adsorption ratio of polymer chains. Finally, we demonstrated the dissipative properties of various NC hydrogels with the model.

scholarly journals Connective Tissue Mechanics of Metridium Senile

1971 ◽  
Vol 55 (3) ◽  
pp. 775-795
Author(s):  
JOHN M. GOSLINE
Keyword(s):  
Mechanical Properties ◽  
Electrostatic Interactions ◽  
Amorphous Polymer ◽  
Polymer Network ◽  
Inorganic Ions ◽  
Tissue Mechanics ◽  
Polymer Chains ◽  
Metridium Senile ◽  
The Matrix ◽  
Elastic Mechanism

1. The mechanical properties of the mesogloea of the sea anemone Metridium senile were investigated. An amorphous polymer network in the matrix was found to play a major role in determining the mechanical properties of the tissue. 2. The matrix network provides an elastic mechanism based on ‘rubber elasticity’ of the folded matrix molecules. The properties of the matrix network alone account for the extensibility and elasticity of mesogloea. 3. The collagen acts as a reinforcing filler providing short-term rigidity to the flimsy polymer network. 4. The collagen fibres are not directly cross-linked to one another but are tied together through the amorphous matrix. 5. The extensibility and elasticity of the tissue appear to be dependent on a very low degree of cross-linking in the mesogloeal system. Inorganic ions mask ionized groups on the collagen and matrix polymer chains and block electrostatic interactions which could cross-link the system.

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