scholarly journals Thermally Switchable Electrically Conductive Thermoset rGO/PK Self-Healing Composites

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 339
Author(s):  
Esteban Araya-Hermosilla ◽  
Alice Giannetti ◽  
Guilherme Macedo R. Lima ◽  
Felipe Orozco ◽  
Francesco Picchioni ◽  
...  
Keyword(s):  
Smart Materials ◽  
High Performance ◽  
Polymer Network ◽  
Conductive Polymer ◽  
Alder Reaction ◽  
Diels Alder ◽  
Self Healing ◽  
Stimuli Responsive ◽  
Electrically Conductive ◽  
Suitable Material

Among smart materials, self-healing is one of the most studied properties. A self-healing polymer can repair the cracks that occurred in the structure of the material. Polyketones, which are high-performance thermoplastic polymers, are a suitable material for a self-healing mechanism: a furanic pendant moiety can be introduced into the backbone and used as a diene for a temperature reversible Diels-Alder reaction with bismaleimide. The Diels-Alder adduct is formed at around 50 °C and broken at about 120 °C, giving an intrinsic, stimuli-responsive self-healing material triggered by temperature variations. Also, reduced graphene oxide (rGO) is added to the polymer matrix (1.6–7 wt%), giving a reversible OFF-ON electrically conductive polymer network. Remarkably, the electrical conductivity is activated when reaching temperatures higher than 100 °C, thus suggesting applications as electronic switches based on self-healing soft devices.

scholarly journals Self-Healing Material Design and Optimization for Soft Robotic Applications

2020 ◽  
Vol 2 (2) ◽  
pp. 38
Keyword(s):  
Reaction Kinetics ◽  
Polymer Network ◽  
Polymer Networks ◽  
Material Design ◽  
Alder Reaction ◽  
Self Healing ◽  
Stimuli Responsive ◽  
Kinetics And Thermodynamics ◽  
Accurate Knowledge ◽  
Robotic Applications

The Diels-Alder reaction between furan and maleimide is the most studied example of reversible covalent chemistries for creating self-healing materials. While scientific articles reporting the synthesis of new reversible polymer networks are numerous, accurate knowledge of the reaction kinetics and thermodynamics of the dynamically reversible equilibrium reaction and the structure and property development of derived stimuli-responsive materials are less widespread. The requirements for the material properties and behavior become more stringent when designing materials for dedicated applications, such as soft robotic structures. Optima need to be sought between reasonably fast reaction kinetics for fast and efficient damage healing at moderate temperatures and mechanical strength and structural stability on the other hand. Stress relaxation is desired to make materials tougher, relieving stress before defects can grow into cracks and ultimately lead to failure, while creep can’t be allowed. Recycling and reprocessing of materials are desirable from an ecological viewpoint, while the materials should also be able to withstand static and dynamic loading in a considerable range of environmental conditions. Accurate knowledge of the reaction kinetics and thermodynamics and an in-depth knowledge of structure-processing-property relations allow smart polymer network design with tailored stimuli-responsive behavior and use as self-healing materials for robotic applications.

Self-Healing Hydrophobic POSS-functionalized Fluorinated Copolymer via RAFT Polymerization and dynamic Diels-Alder Reaction

2021 ◽  
Author(s):  
Siva Ponnupandian ◽  
Prantik Mondal ◽  
Thomas Becker ◽  
Richard Hoogenboom ◽  
Andrew B Lowe ◽  
...  
Keyword(s):  
Chain Transfer ◽  
Raft Polymerization ◽  
Alder Reaction ◽  
Diels Alder ◽  
Self Healing ◽  
Diels Alder Reaction ◽  
Reversible Addition

This investigation reports the preparation of a tailor-made copolymer of furfuryl methacrylate (FMA) and trifluoroethyl methacrylate (TFEMA) via reversible addition-fragmentation chain transfer (RAFT) polymerization. The furfuryl groups of the copolymer...

High performance epoxy coating with cross-linkable solvent via Diels-Alder reaction for anti-corrosion of concrete

2020 ◽  
Vol 139 ◽  
pp. 105473 ◽  
Author(s):  
Jinfeng Chi ◽  
Guoliang Zhang ◽  
Qingyi Xie ◽  
Chunfeng Ma ◽  
Guangzhao Zhang
Keyword(s):  
High Performance ◽  
Alder Reaction ◽  
Diels Alder ◽  
Epoxy Coating ◽  
Diels Alder Reaction

New Chain Extenders for Self-Healing Polymers

2021 ◽  
Vol 899 ◽  
pp. 628-637
Author(s):  
Daria V. Zakharova ◽  
Zalina A. Lok’yaeva ◽  
Alexander A. Pavlov ◽  
Alexander V. Polezhaev
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Hydroxyl Groups ◽  
Structural Fragment ◽  
Self Healing ◽  
Diels Alder Reaction ◽  
Small Series ◽  
Chain Extenders ◽  
Reversible Covalent ◽  
Thermochemical Parameters

We present here a small series of compounds designed to modify the polymer chain of various polyurethanes in order to introduce a structural fragment with the ability of thermally-triggered reversible covalent interactions. Bismaleimides (2a-2e) were synthesized from commercially available aromatic and aliphatic symmetric diamines (1a-1e) and were further introduced into the Diels-Alder reaction with furfuryl alcohol as dienophiles. The Diels-Alder adducts (3a-3e) were obtained as a mixture of endo- and exo-isomer. The presence of symmetrical hydroxyl groups in the structure of the obtained compounds makes them suitable as chain extenders of low molecular weight diisocyanate prepolymers. The presence of a thermally reversible Diels-Alder reaction adduct in the structure of potential chain-extenders opens a possibility to create unique materials with self-healing properties. All compounds obtained were characterized by 1H, 13C NMR, ESI-HRMS, and IR spectroscopy. The thermochemical parameters of the reverse Diels-Alder reaction were established using DSC analysis.

scholarly journals Coupling the Microscopic Healing Behaviour of Coatings to the Thermoreversible Diels-Alder Network Formation

Coatings ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 13 ◽  
Author(s):  
Joost Brancart ◽  
Robrecht Verhelle ◽  
Jessica Mangialetto ◽  
Guy Van Assche
Keyword(s):  
Network Formation ◽  
Polymer Network ◽  
Cycloaddition Reaction ◽  
Thermomechanical Properties ◽  
Alder Reaction ◽  
Diels Alder ◽  
Force Microscopy ◽  
Diels Alder Reaction ◽  
Atomic Force ◽  
Microscopic Evaluation

While thermally reversible polymer network coatings based on the Diels-Alder reaction are widely studied, the mechanisms responsible for the heating-mediated healing of damage is still not well understood. The combination of microscopic evaluation techniques and fundamental insights for the thermoreversible network formation in the bulk and coating shed light on the mechanisms behind the damage healing events. The thermomechanical properties of thermoset and elastomer coatings, crosslinked by the furan-maleimide Diels-Alder cycloaddition reaction, were studied in bulk and compared to the thermal behaviour applied as coatings onto aluminium substrates. The damage sealing of thermoset (Tg = 79 °C) and elastomer (Tg = −49 °C) coatings were studied using nano-lithography and atomic force microscopy (AFM). The sealing event is studied and modelled at multiple temperatures and correlated to the changes in the network structure and corresponding thermomechanical properties.

Bio-based self-healing coatings based on thermo-reversible Diels-Alder reaction

2017 ◽  
Vol 111 ◽  
pp. 38-46 ◽  
Author(s):  
Daniel H. Turkenburg ◽  
Yvon Durant ◽  
Hartmut R. Fischer
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Self Healing ◽  
Diels Alder Reaction

scholarly journals Room Temperature Self-Healing in Soft Pneumatic Robotics: Autonomous Self-Healing in a Diels-Alder Polymer Network

2020 ◽  
Vol 27 (4) ◽  
pp. 44-55
Author(s):  
Seppe Terryn ◽  
Joost Brancart ◽  
Ellen Roels ◽  
Guy Van Assche ◽  
Bram Vanderborght
Keyword(s):  
Room Temperature ◽  
Polymer Network ◽  
Diels Alder ◽  
Self Healing
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