Journal ArticleDOI
Dynamic Covalent Polymer Networks: from Old Chemistry to Modern Day Innovations.
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This work designs dynamic covalent polymer networks with unique adaptive properties for vitrimeric rheological behavior and solid-state plasticity for this type of material, and suggests a promising future for this class of materials.Abstract:
Dynamic covalent polymer networks have long been recognized. With the initial focus on the unintended impact of dynamic covalent linkages on the viscoelasticity of commercial rubbers, efforts in modern times have transitioned into designing dynamic covalent polymer networks with unique adaptive properties. Whereas self-healing and thermoset reprocessing have been the primary motivations for studying dynamic covalent polymer networks, the recent discovery of the vitrimeric rheological behavior and solid-state plasticity for this type of material have opened up new opportunities in material innovations. This, coupled with the revelation of the dynamic characteristics of commercially relevant polymer building blocks such as esters and urethanes, suggests a promising future for this class of materials.read more
Citations
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Covalent Adaptive Networks for Enhanced Adhesion: Exploiting Disulfide Dynamic Chemistry and Annealing during Application
TL;DR: In this article, it is shown that during the curing process of traditional thermoset adhesives/sealants, it is impractical to avoid all non-ideal conditions, e.g., preassembly reactions, trapped voids, and polymerization induced sh...
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Double neighbouring group participation for ultrafast exchange in phthalate monoester networks
TL;DR: In this article, a model study of PMEs with different substituents at the β-carbon position was performed, showing a remarkable acceleration for alcohols containing tertiary amines on the β carbon.
Journal ArticleDOI
Closed-loop chemical recycling of thermosetting polymers and their applications: a review
TL;DR: In this article , closed-loop recycling of novel thermosets as a closed loop process is proposed, where the closed loop is used to reuse the thermoset when discarded.
Journal ArticleDOI
Unconstrained 3D Shape Programming with Light-Induced Stress Gradient.
TL;DR: Wang et al. as mentioned in this paper introduced dynamic diselenide bonds into shape-memory materials, and the material could hold and release internal stress by themselves through the shapememory effect, simplifying programming setups.
Journal ArticleDOI
In Situ Network Formation in PBT Vitrimers via Processing-Induced Deprotection Chemistry.
Yanwu Zhou,Johannes Gerardus Petrus Goossens,Sjarco van den Bergen,Rint P. Sijbesma,Johan P. A. Heuts +4 more
TL;DR: It is shown that theUse of protected pentaerythritol as a latent cross-linker and the use of a Zn(II) transesterification catalyst allows for the in situ dynamic network formation in PBT during processing, with a delayed onset of gelation.
References
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Journal ArticleDOI
Autonomic healing of polymer composites
Scott R. White,Nancy R. Sottos,Philippe H. Geubelle,Jeffrey S. Moore,Jeffrey S. Moore,Michael R. Kessler,Suresh R. Sriram,Suresh R. Sriram,Eric Brown,S. Viswanathan +9 more
TL;DR: A structural polymeric material with the ability to autonomically heal cracks is reported, which incorporates a microencapsulated healing agent that is released upon crack intrusion and polymerization of the healing agent is triggered by contact with an embedded catalyst, bonding the crack faces.
Journal ArticleDOI
Controlled/living radical polymerization: Features, developments, and perspectives
TL;DR: In this article, a review of recent mechanistic developments in the field of controlled/living radical polymerization (CRP) is presented, with particular emphasis on structure-reactivity correlations and "rules" for catalyst selection in ATRP, for chain transfer agent selection in reversible addition-fragmentation chain transfer (RAFT) polymerization, and for the selection of an appropriate mediating agent in stable free radical polymerisation (SFRP), including organic and transition metal persistent radicals.
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Self-healing and thermoreversible rubber from supramolecular assembly
TL;DR: The design and synthesis of molecules that associate together to form both chains and cross-links via hydrogen bonds and the system shows recoverable extensibility up to several hundred per cent and little creep under load are designed and synthesized.
Journal ArticleDOI
A Thermally Re-mendable Cross-Linked Polymeric Material
Xiangxu Chen,Matheus Adrianus Dam,Kanji Ono,Ajit Mal,Hongbin Shen,Steven Nutt,Kevin Sheran,Fred Wudl +7 more
TL;DR: A transparent organic polymeric material that can repeatedly mend or “re-mend” itself under mild conditions and is a tough solid at room temperature and below with mechanical properties equaling those of commercial epoxy resins.
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Silica-Like Malleable Materials from Permanent Organic Networks
TL;DR: In this paper, the authors designed epoxy networks that can rearrange their topology by exchange reactions without depolymerization, and showed that they are insoluble and processable.