Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 132, Issue 34, Pages 12051-12058Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja104446r
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Funding
- EPSRC
- NSF [EP/D07434711, EP/G026203/1, NSF-DMR-0602869]
- Henkel Adhesives Ltd.
- Engineering and Physical Sciences Research Council [EP/G026203/1, EP/D074347/1] Funding Source: researchfish
- EPSRC [EP/G026203/1, EP/D074347/1] Funding Source: UKRI
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An elastomeric, healable, supramolecular polymer blend comprising a chain-folding polyimide and a telechelic polyurethane with pyrenyl end groups is compatibilized by aromatic pi-pi stacking between the pi-electron-deficient diimide groups and the pi-electron-rich pyrenyl units. This interpolymer interaction is the key to forming a tough, healable, elastomeric material. Variable-temperature FTIR analysis of the bulk material also conclusively demonstrates the presence of hydrogen bonding, which complements the pi-pi stacking interactions. Variable-temperature SAXS analysis shows that the healable polymeric blend has a nanophase-separated morphology and that the X-ray contrast between the two types of domain increases with increasing temperature, a feature that is repeatable over several heating and cooling cycles. A fractured sample of this material reproducibly regains more than 95% of the tensile modulus, 91% of the elongation to break, and 77% of the modulus of toughness of the pristine material.
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