A Healable Supramolecular Polymer Blend Based on Aromatic pi-pi Stacking and Hydrogen-Bonding Interactions

作者：Burattini Stefano; Greenland Barnaby W; Merino Daniel Hermida; Weng Wengui; Seppala Jonathan; Colquhoun Howard M^*; Hayes Wayne; Mackay Michael E; Hamley Ian W; Rowan Stuart J

来源：Journal of the American Chemical Society, 2010, 132(34): 12051-12058.

DOI：10.1021/ja104446r

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.

• 出版日期2010-9-1