Journal ArticleDOI
Revisiting Acetoacetyl Chemistry to Build Malleable Cross-Linked Polymer Networks via Transamidation
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In this article, the authors exploit acetoacetyl chemistry to design CANs in which Acetoacetyl formed amides (AFAs) act as a type of dynamic covalent bonds.Abstract:
Covalent adaptable networks (CANs) have various potential applications for their dynamic features benefiting from the existence of dynamic covalent bonds (DCBs). Here we exploit acetoacetyl chemistry to design CANs in which acetoacetyl formed amides (AFAs) act as a type of DCBs. We first illuminate that the transamidation of AFAs is ascribed to a “proton-switch” mechanism via model study and DFT calculations. When such AFA linkages are incorporated into cross-linked polymer networks, the malleability and recyclability are demonstrated. After recycling the polymer networks for three times, there are no significant mechanical changes or degradations observed. The study reveals that the transamidation is an economic and efficient exchange reaction in the preparation of CANs.read more
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Adaptable Crosslinks in Polymeric Materials: Resolving the Intersection of Thermoplastics and Thermosets.
TL;DR: This Perspective aims to both outline the fundamental theory of CANs and provide a critical assessment of their current status, and identify current issues and address possible solutions for better fundamental understanding within this field.
Journal ArticleDOI
Reprocessable Cross-Linked Polymer Networks: Are Associative Exchange Mechanisms Desirable?
TL;DR: The realization that the cross-link exchange mechanism does not greatly influence the practical reprocessing behavior of most CANs suggests that exchange chemistries can be considered with fewer constraints, focusing instead on their activation parameters, synthetic convenience, and application-specific considerations.
Journal ArticleDOI
Structural tuning of polycaprolactone based thermadapt shape memory polymer
TL;DR: In this article, a transesterification based polycaprolactone (PCL) network with tunable crosslinking density and hydroxyl content was synthesized using a thiol-ene click reaction.
Journal ArticleDOI
Recyclable polymer networks containing hydroxyurethane dynamic cross-links: Tuning morphology, cross-link density, and associated properties with chain extenders
TL;DR: In this article, two types of small-molecule chain extender are incorporated into these networks to tune their morphologies, cross-link densities and associated properties, and the resulting materials remain fully reprocessable.
Journal ArticleDOI
Reaction-Diffusion Model for Thermosetting Polymer Dissolution through Exchange Reactions Assisted by Small-Molecule Solvents
TL;DR: In this article, a small-molecule-participated bond exchange reaction (BE) was used to dissolve a thermodynamic polymers involving dynamic bonds or exchange reactions (also known as vitrimers).
References
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TL;DR: The scope of dynamic covalent reactions is rapidly expanding, and the reversible reactions suitable for DCvC are still very limited.
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TL;DR: A tutorial review on covalent adaptable networks (CANs), in which covalently crosslinked networks are formed such that triggerable, reversible chemical structures persist throughout the network, and how the application of a stimulus causes these materials to alter their shape, topography, and properties is provided.