Properties of Reversible Diels-Alder Furan/Maleimide Polymer Networks as Function of Crosslink Density

Thermally reversible thermosets are synthesized based on furan functionalized polyketones crosslinked with (methylene‐di‐p‐phenylene)bis‐maleimide. The number of furan groups present along the backbone and the crosslinker/furan molar ratio are varied. According to DSC measurements the de‐crosslinkin...

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Bibliographic Details
Published in:Macromolecular chemistry and physics 2012-01, Vol.213 (2), p.157-165
Main Authors: Toncelli, Claudio, De Reus, Dennis C., Picchioni, Francesco, Broekhuis, Antonius A.
Format: Article
Language:English
Subjects:
diels-alder polymers
self-healing
shape-memory
stimulus-sensitive polymers
structure-property relations
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Summary:Thermally reversible thermosets are synthesized based on furan functionalized polyketones crosslinked with (methylene‐di‐p‐phenylene)bis‐maleimide. The number of furan groups present along the backbone and the crosslinker/furan molar ratio are varied. According to DSC measurements the de‐crosslinking temperature does not change significantly as function of furan intake and its molar ratio with the crosslinker. All samples show an almost complete recovery of storage and loss modulus. The crosslinked samples are recycled up to seven times without significant quality loss. This suggests that a change in conformation does not result in different visco‐elastic behavior. The most crosslinked sample is able to fully repair itself within 1 hour. A number of low crosslink density materials additionally show a shape memory effect. Thermo‐reversible polymer networks based on furan‐modified polyketone and a bis‐maleimide crosslinker are synthesized and characterized. Product properties are related to the crosslink density and the degree of polyketone functionalization. Polyketone modification provides a novel toolbox to design reversible thermosetting polymers.
ISSN:1022-1352
1521-3935
DOI:10.1002/macp.201100405