Abstract
Cross-linked elastomers containing reversibly binding side groups are capable of storing elastic energy on multiple time-scales, giving rise to shape-memory and self-healing properties. Photo-cross-linkable benzophenone side groups were incorporated into linear macromers containing reversible (2-ureido-4-pyrimidinone, UPy) side groups. This method enables melt-processing of shape-memory elastomers into complex permanent shapes, and samples can be prepared with much higher UPy-content. UV–vis spectroscopy was applied to study the efficacy of the cross-linking process. Resulting elastomer networks with variable densities of covalent cross-links and reversibly associating side groups were systematically prepared and studied. Dynamic mechanical analysis revealed the presence of two storage modulus plateaus: a high-temperature plateau attributed to covalent cross-links, and a lower temperature plateau attributed to both reversible and covalent cross-links. Results also show that dynamic cross-links behave near...
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