Preemptive healing through supramolecular cross-links

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Abstract

The ability of highly cross-linked thermoset materials to relax stresses by network chainsegment mobility above or just below Tg is generally limited. We describe materials in whichsome of the cross-links have been replaced by dimers of quadruple hydrogen bonding ureidopyrimidinone(UPy) moieties, which act as reversible cross-links. Materials based on mixturesof ??-caprolactone and L-lactic acid, and containing different ratios of covalent and UPy dimercross-links, were synthesized and their thermal and mechanical properties were tested byDifferential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA). Thepresence of reversible cross-links results in superior relaxation of stresses even below Tg, aswitnessed by the creep and stress relaxation behavior. These properties bode well for potentialapplications, e.g. in coatings technology.
Original languageEnglish
Pages (from-to)6640-6646
JournalMacromolecules
Volume42
Issue number17
DOIs
Publication statusPublished - 2009

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