Introduction to chemistry for covalent adaptable networks
Christopher Bowman, Filip Du Prez and Julia Kalow introduce the Polymer Chemistry themed collection on chemistry for covalent adaptable networks.
Polymer actuators based on covalent adaptable networks
Advances in polymer actuators containing covalent adaptable networks (CANs) are summarized and discussed in this review.
Self-healing behaviour of furan–maleimide poly(ionic liquid) covalent adaptable networks
Recovery of mechanical (tensile testing) and conductive (chronoamperometric cycling) properties was observed for PIL networks containing thermoreversible furan–maleimide crosslinks.
Functionalization of polyisoprene and polystyrene via reactive processing using azidoformate grafting agents, and its application to the synthesis of dioxaborolane-based polyisoprene vitrimers
Azidoformates carrying dioxaborolane functions were used to functionalize PI and PS, and to prepare PI vitrimers by reactive processing.
Dynamic polyurethane thermosets: tuning associative/dissociative behavior by catalyst selection
Catalyst selection can tune the associative/dissociative dynamic behaviour of polyurethane themosets.
Dicarboxylic acid-epoxy vitrimers: influence of the off-stoichiometric acid content on cure reactions and thermo-mechanical properties
Vitrimers with 1 : 1 to 2 : 1 epoxy/acid ratio and TBD show increased stiffness and gradual transition from an exchangeable to non-exchangeable network.
Influence of the polymer matrix on the viscoelastic behaviour of vitrimers
Vitrimers, an emerging field of research, in which still many fundamental aspects of material design remain to be explored. Here, we systematically explore the effect of the choice of the matrix on a dynamic exchange reaction in a polymer network.
Cross-linker control of vitrimer flow
The rate of stress relaxation in a vitrimer can be modulated by changing solely the structure of the cross-linker electrophile.
Mixed mechanisms of bond exchange in covalent adaptable networks: monitoring the contribution of reversible exchange and reversible addition in thiol–succinic anhydride dynamic networks
Thioester anhydride reversible addition and thiol–thioester reversible exchange are discussed as two competing mechanisms dictating the dynamic response in thiol–succinic anhydride dynamic networks.
Functionalization of amine-cured epoxy resins by boronic acids based on dynamic dioxazaborocane formation
Functionalization of epoxy resins after curing was performed based on dynamic dioxazaborocane formation between intrinsic diethanolamine units in amine-cured epoxy resins and boronic acid modifiers.
Mechanically robust and reprocessable imine exchange networks from modular polyester pre-polymers
Covalent adaptable networks (CANs) containing dynamic imine cross-links impart recyclability to thermoset materials, and the distribution of these cross-links greatly affects their observed thermomechanical properties.
Solvent processable and recyclable covalent adaptable organogels based on dynamic trans-esterification chemistry: separation of toluene from azeotropic mixtures
New covalent adaptable networks (CANs) possessing processability and recyclability to monomers are desirable as an alternative to traditional plastics to address plastic waste-related issues.
Structural tuning of polycaprolactone based thermadapt shape memory polymer
Polycaprolactone based thermadapt shape memory polymers with precisely controlled structures allow tunable shape reconfigurability.
Epoxy vitrimers incorporating physical crosslinks produced by self-association of alkyl chains
Vitrimers synthesized from epoxy-carboxylic acid-alkylamine (Cn) formulations exhibit tunable mechanical properties and stress relaxation without using external catalysts.
Tuning the mechanical and dynamic properties of imine bond crosslinked elastomeric vitrimers by manipulating the crosslinking degree
Imine bond crosslinked networks with tunable mechanical and dynamic properties are prepared by varying the precursor molecular weight and network crosslinking degree.
Dual-dynamic interpenetrated networks tuned through macromolecular architecture
Controlled polymerization is used to make well defined polymers that are assembled into dynamic interpenetrated network materials. Self-healing, toughness and stress relaxation are imparted into the material through the dynamic linkages.
Combining polybenzoxazines and polybutadienes via simultaneous inverse and direct vulcanization for flexible and recyclable thermosets by polysulfide dynamic bonding
Simultaneous inverse and direct vulcanization of a benzoxazine and a polybutadiene gave recyclable films through dynamic S–S bonding.
About this collection
This special issue, Guest Edited by Filip Du Prez (Ghent University), Christopher Bowman (University of Colorado) and Julia Kalow (Northwestern University) presents the latest developments in new dynamic covalent chemistry strategies and derived materials for covalent adaptable networks and related dynamic polymeric network materials, such as vitrimers.
Articles will be added to the collection as they are published.