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

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• 作者：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
• 刊名：Journal of the American Chemical Society
• 出版年：2010
• 出版时间：September 1, 2010
• 年：2010
• 卷：132
• 期：34
• 页码：12051-12058
• 全文大小：390K
• 年卷期：v.132,no.34(September 1, 2010)
• ISSN：1520-5126

文摘

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 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.