Properties of Reversible Diels-Alder Furan/Maleimide Polymer Networks as Function of Crosslink Density

2012 ◽  
Vol 213 (2) ◽  
pp. 157-165 ◽  
Author(s):  
Claudio Toncelli ◽  
Dennis C. De Reus ◽  
Francesco Picchioni ◽  
Antonius A. Broekhuis
Keyword(s):  
Crosslink Density ◽  
Polymer Networks ◽  
Diels Alder

scholarly journals Recent Observations on the Mechanical Properties of Polymer Networks

1971 ◽  
Vol 44 (5) ◽  
pp. 1256-1272 ◽  
Author(s):  
P. Thirion ◽  
R. Chasset
Keyword(s):  
Crosslink Density ◽  
Room Temperature ◽  
Dynamic Properties ◽  
Polymer Networks ◽  
The Other ◽  
Dilution Ratio ◽  
Chain Entanglement ◽  
Influence Of Temperature ◽  
Terminal Zone ◽  
Crosslinking Agents

Abstract The influence of temperature, elongation, swelling or dilution ratio, crosslink density, nature of the polymers, and crosslinking agents on the dynamic properties, creep and relaxation of polymer networks is surveyed in the terminal region of the spectrum. Whereas the deformation does not change the relaxation kinetics in large ranges of extension, the crosslink density acts as a reduced variable apparently accelerating uniformly the viscoelastic processes beyond the glass transition. The other possible reductions ‘time-temperature’ and ‘time—swelling’ do not necessarily seem related to the variations of free volume. From the viewpoint of the explanation of the relaxation mechanisms in the terminal zone, the fact that the equilibrium of loosely crosslinked elastomers would only virtually be reached after several years at room temperature seem in better agreement with chain entanglement effects, either trapped or not by the permanent network, than with the dissociation of secondary linkages.

scholarly journals Electrically-Responsive Reversible Polyketone/MWCNT Network through Diels-Alder Chemistry

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1076 ◽  
Author(s):  
Rodrigo Araya-Hermosilla ◽  
Andrea Pucci ◽  
Patrizio Raffa ◽  
Dian Santosa ◽  
Paolo Pescarmona ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Polymer Networks ◽  
Conductive Polymer ◽  
Mechanical Analysis ◽  
Diels Alder ◽  
Resistive Heating ◽  
Compression Moulding ◽  
Electrically Conductive ◽  
The Matrix ◽  
Tan Δ

This study examines the preparation of electrically conductive polymer networks based on furan-functionalised polyketone (PK-Fu) doped with multi-walled carbon nanotubes (MWCNTs) and reversibly crosslinked with bis-maleimide (B-Ma) via Diels-Alder (DA) cycloaddition. Notably, the incorporation of 5 wt.% of MWCNTs results in an increased modulus of the material, and makes it thermally and electrically conductive. Analysis by X-ray photoelectron spectroscopy indicates that MWCNTs, due to their diene/dienophile character, covalently interact with the matrix via DA reaction, leading to effective interfacial adhesion between the components. Raman spectroscopy points to a more effective graphitic ordering of MWCNTs after reaction with PK-Fu and B-Ma. After crosslinking the obtained composite via the DA reaction, the softening point (tan(δ) in dynamic mechanical analysis measurements) increases up to 155 °C, as compared to the value of 130 °C for the PK-Fu crosslinked with B-Ma and that of 140 °C for the PK-Fu/B-Ma/MWCNT nanocomposite before resistive heating (responsible for crosslinking). After grinding the composite, compression moulding (150 °C/40 bar) activates the retro-DA process that disrupts the network, allowing it to be reshaped as a thermoplastic. A subsequent process of annealing via resistive heating demonstrates the possibility of reconnecting the decoupled DA linkages, thus providing the PK networks with the same thermal, mechanical, and electrical properties as the crosslinked pristine systems.

Thermodynamics and Stereochemistry of Diels–Alder Polymer Networks: Role of Crosslinker Flexibility and Crosslinking Density

2021 ◽  
Author(s):  
Qing Zhou ◽  
Zhen Sang ◽  
Kartik Kumar Rajagopalan ◽  
Yelena Sliozberg ◽  
Frank Gardea ◽  
...  
Keyword(s):  
Polymer Networks ◽  
Crosslinking Density ◽  
Diels Alder

Melt-Blown Cross-Linked Fibers from Thermally Reversible Diels–Alder Polymer Networks

2018 ◽  
Vol 7 (11) ◽  
pp. 1339-1345 ◽  
Author(s):  
Kailong Jin ◽  
Sung-soo Kim ◽  
Jun Xu ◽  
Frank S. Bates ◽  
Christopher J. Ellison
Keyword(s):  
Polymer Networks ◽  
Diels Alder

Comprehensive study of the thermo-reversibility of Diels–Alder based PCL polymer networks

Polymer ◽  
2016 ◽  
Vol 84 ◽  
pp. 234-242 ◽  
Author(s):  
Thomas Defize ◽  
Jean-Michel Thomassin ◽  
Michaël Alexandre ◽  
Bernard Gilbert ◽  
Raphaël Riva ◽  
...  
Keyword(s):  
Polymer Networks ◽  
Diels Alder ◽  
Comprehensive Study

Dual Role for 1,2,4,5-Tetrazines in Polymer Networks: Combining Diels–Alder Reactions and Metal Coordination To Generate Functional Supramolecular Gels

2015 ◽  
Vol 4 (4) ◽  
pp. 458-461 ◽  
Author(s):  
Ken Kawamoto ◽  
Scott C. Grindy ◽  
Jenny Liu ◽  
Niels Holten-Andersen ◽  
Jeremiah A. Johnson
Keyword(s):  
Polymer Networks ◽  
Dual Role ◽  
Diels Alder ◽  
Metal Coordination ◽  
Generate Functional ◽  
Supramolecular Gels

Rheological properties of silicon polymer networks: The influence of the crosslink density

2002 ◽  
Vol 87 (7) ◽  
pp. 1152-1160 ◽  
Author(s):  
C. Robert ◽  
A. Crespy ◽  
S. Bastide ◽  
J.-M. Lopez-Cuesta ◽  
S. Kerboeuf ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Crosslink Density ◽  
Polymer Networks
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