2022
DOI: 10.1002/anie.202210405
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A Highly Dynamic Covalent Polymer Network without Creep: Mission Impossible?

Abstract: Dynamic covalent polymer networks provide an interesting solution to the challenging recyclability of thermosets and elastomers. One of the remaining design constraints, however, is balancing thermal reprocessability in the form of material flow with dimensional stability during use. As a result, many chemistries are being investigated in order to improve bond reactivity control and material robustness. This Minireview highlights a number of promising concepts, with a particular emphasis on disconnecting chemi… Show more

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Cited by 90 publications
(89 citation statements)
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“…[8][9][10][11][12] Over the last two decades, a great deal of research has gone into determining on which time scale and to what extent a dynamic covalent network will start to show signicant ow. 5,7,[13][14][15][16][17][18][19] To accurately address this question, one should investigate both the kinetics and thermodynamics of the underlying bond formation, cleavage, reformation or rearrangement within the viscoelastic material. This is for example quite relevant if advanced processing options such as extrusion and additive manufacturing are targeted for such dynamic materials.…”
Section: Introductionmentioning
confidence: 99%
“…[8][9][10][11][12] Over the last two decades, a great deal of research has gone into determining on which time scale and to what extent a dynamic covalent network will start to show signicant ow. 5,7,[13][14][15][16][17][18][19] To accurately address this question, one should investigate both the kinetics and thermodynamics of the underlying bond formation, cleavage, reformation or rearrangement within the viscoelastic material. This is for example quite relevant if advanced processing options such as extrusion and additive manufacturing are targeted for such dynamic materials.…”
Section: Introductionmentioning
confidence: 99%
“…An especially well-known problem is the occurrence of creep in CANs at ambient conditions. 148 Because of the (constant) bond exchange in CANs, they relax stress over time. As such, when a force is applied that leads to deformation of a CAN material, stress re- laxation via bond exchange will compensate for this deformation, leading to creep of the material.…”
Section: Chemistry Of Cansmentioning
confidence: 99%
“…Ideally, these relationships could be applied predictively to engineer a network with target stiffness, temperature dependence, and time scale of rearrangement that match the intended application. For example, a plastic with improved recyclability should exhibit flow at elevated temperatures but undergo minimal rearrangement at room temperature . Similarly, a dynamic hydrogel for biomimetic cell culture should match the mechanics of the native tissue of interest at 37 °C and cannot employ cytotoxic catalysts.…”
Section: Introductionmentioning
confidence: 99%