scholarly journals Tuning porosity and activity of microporous polymer network organocatalysts by co-polymerisation

2014 ◽  
Vol 50 (25) ◽  
pp. 3347-3349 ◽  
Author(s):  
Johannes Schmidt ◽  
Dipti Sankar Kundu ◽  
Siegfried Blechert ◽  
Arne Thomas
Keyword(s):  
Polymer Network ◽  
Microporous Polymer

A Chiral Microporous Polymer Network as Asymmetric Heterogeneous Organocatalyst

2011 ◽  
Vol 353 (17) ◽  
pp. 3101-3106 ◽  
Author(s):  
Christian Bleschke ◽  
Johannes Schmidt ◽  
Dipti S. Kundu ◽  
Siegfried Blechert ◽  
Arne Thomas
Keyword(s):  
Polymer Network ◽  
Microporous Polymer

A Tetrathiafulvalene (TTF)-Conjugated Microporous Polymer Network

2014 ◽  
Vol 20 (31) ◽  
pp. 9543-9548 ◽  
Author(s):  
Hakan Bildirir ◽  
Jens Peter Paraknowitsch ◽  
Arne Thomas
Keyword(s):  
Polymer Network ◽  
Conjugated Microporous Polymer ◽  
Microporous Polymer

scholarly journals One-step synthesis of a cyclic 2,17-dioxo[3,3](4,4′) biphenylophane and first preparation of a microporous polymer network from a macrocyclic precursor by cyclotrimerization

2015 ◽  
Vol 51 (43) ◽  
pp. 9046-9049 ◽  
Author(s):  
Suman Kalyan Samanta ◽  
Eduard Preis ◽  
Christian W. Lehmann ◽  
Richard Goddard ◽  
Saientan Bag ◽  
...  
Keyword(s):  
Polymer Network ◽  
Microporous Polymer ◽  
One Step

Macrocycle 2,17-dioxo[3,3](4,4′)biphenylophane was synthesized and used in the formation of a microporous polymer network.

scholarly journals Microporous polymer network films covalently bound to gold electrodes

2015 ◽  
Vol 51 (20) ◽  
pp. 4283-4286 ◽  
Author(s):  
Daniel Becker ◽  
Nina Heidary ◽  
Marius Horch ◽  
Ulrich Gernert ◽  
Ingo Zebger ◽  
...  
Keyword(s):  
Thin Films ◽  
Polymer Network ◽  
Polymer Networks ◽  
Gold Electrodes ◽  
Microporous Polymer ◽  
Covalently Bound

Thin films of microporous polymer networks are covalently attached to SAM functionalized gold electrodes.

An Anionic Microporous Polymer Network Prepared by the Polymerization of Weakly Coordinating Anions

2013 ◽  
Vol 52 (46) ◽  
pp. 12174-12178 ◽  
Author(s):  
Sabrina Fischer ◽  
Johannes Schmidt ◽  
Peter Strauch ◽  
Arne Thomas
Keyword(s):  
Polymer Network ◽  
Weakly Coordinating Anions ◽  
Microporous Polymer ◽  
Weakly Coordinating

Freeze-etch TEM of aqueous polymer gel network morphology

1986 ◽  
Vol 44 ◽  
pp. 796-797
Author(s):  
J. A. N. Zasadzinski ◽  
R. K. Prud'homme
Keyword(s):  
Metal Ion ◽  
Polymer Network ◽  
Polymer Gels ◽  
Polymer Gel ◽  
Deformation History ◽  
Crosslinked Polymer ◽  
Aqueous Polymer ◽  
History Of ◽  
Gel Network ◽  
Network Morphology

The rheological and mechanical properties of crosslinked polymer gels arise from the structure of the gel network. In turn, the structure of the gel network results from: thermodynamically determined interactions between the polymer chain segments, the interactions of the crosslinking metal ion with the polymer, and the deformation history of the network. Interpretations of mechanical and rheological measurements on polymer gels invariably begin with a conceptual model of,the microstructure of the gel network derived from polymer kinetic theory. In the present work, we use freeze-etch replication TEM to image the polymer network morphology of titanium crosslinked hydroxypropyl guars in an attempt to directly relate macroscopic phenomena with network structure.

Investigation of the Microscopic Viscoelastic Property for Cross-linked Polymer Network by Molecular Dynamics Simulation

2011 ◽  
Vol 39 (1) ◽  
pp. 44-58 ◽  
Author(s):  
Y. Masumoto ◽  
Y. Iida
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Analytical Method ◽  
Viscoelastic Properties ◽  
Polymer Network ◽  
Dynamics Simulation ◽  
Coarse Grained ◽  
The Cross ◽  
Microscopic Dynamic ◽  
Coarse Grained Molecular Dynamics

Abstract The purpose of this work is to develop a new analytical method for simulating the microscopic mechanical property of the cross-linked polymer system using the coarse-grained molecular dynamics simulation. This new analytical method will be utilized for the molecular designing of the tire rubber compound to improve the tire performances such as rolling resistance and wet traction. First, we evaluate the microscopic dynamic viscoelastic properties of the cross-linked polymer using coarse-grained molecular dynamics simulation. This simulation has been conducted by the coarse-grained molecular dynamics program in the OCTA) (http://octa.jp/). To simplify the problem, we employ the bead-spring model, in which a sequence of beads connected by springs denotes a polymer chain. The linear polymer chains that are cross-linked by the cross-linking agents express the three-dimensional cross-linked polymer network. In order to obtain the microscopic dynamic viscoelastic properties, oscillatory deformation is applied to the simulation cell. By applying the time-temperature reduction law to this simulation result, we can evaluate the dynamic viscoelastic properties in the wide deformational frequency range including the rubbery state. Then, the stress is separated into the nonbonding stress and the bonding stress. We confirm that the contribution of the nonbonding stress is larger at lower temperatures. On the other hand, the contribution of the bonding stress is larger at higher temperatures. Finally, analyzing a change of microscopic structure in dynamic oscillatory deformation, we determine that the temperature/frequency dependence of bond stress response to a dynamic oscillatory deformation depends on the temperature dependence of the average bond length in the equilibrium structure and the temperature/frequency dependence of bond orientation. We show that our simulation is a useful tool for studying the microscopic properties of a cross-linked polymer.

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