Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 221, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.202000208
Keywords
Diels-Alder; mechanical properties; photopolymerization; thermoresponsive polymers
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Funding
- TU/e Impuls
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Photopolymerization of (meth)acrylates into highly crosslinked networks is in general accompanied by volumetric shrinkage, often leading to premature material failure. In this work, thermoreversible Diels-Alder groups are investigated to explore their effect on material lifetime. A difunctional acrylic monomer containing Diels-Alder moieties is synthesized and successfully incorporated in a polymer network by photopolymerization. It is demonstrated that upon heating above 150 degrees C, the Diels-Alder bonds open, yielding topological rearrangements of the network. The mechanical properties of the material after opening of the Diels-Alder moieties are investigated by tensile testing, showing a high strain-rate dependence of the yield stress which is indicative of a longer lifetime at the higher strain rates that are prevalent in load-bearing applications.
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