A Healable Supramolecular Polymer Blend Based on Aromatic π−π Stacking and Hydrogen-Bonding Interactions
Stefano Burattini
Barnaby W. Greenland
Daniel Hermida Merino
Wengui Weng
Jonathan Seppala
Howard M. Colquhoun
Wayne Hayes
Michael E. Mackay
Ian W. Hamley
Stuart J. Rowan
10.1021/ja104446r.s001
https://acs.figshare.com/articles/journal_contribution/A_Healable_Supramolecular_Polymer_Blend_Based_on_Aromatic__Stacking_and_Hydrogen_Bonding_Interactions/2737879
An elastomeric, healable, supramolecular polymer blend comprising a chain-folding polyimide and a telechelic polyurethane with pyrenyl end groups is compatibilized by aromatic π−π stacking between the π-electron-deficient diimide groups and the π-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 π−π 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 <i>increases</i> 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.
2010-09-01 00:00:00
bulk material
modulu
FTIR
cooling cycles
telechelic polyurethane
interpolymer interaction
healable
SAXS
elastomeric material
domain increases
supramolecular polymer blend
analysis
Healable Supramolecular Polymer
pyrenyl end groups