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A novel self-healing supramolecular polymer system

Burattini, S., Colquhoun, H.M., Greenland, B.W. and Hayes, W. (2009) A novel self-healing supramolecular polymer system. Faraday Discussions, 143. pp. 251-264. ISSN 1364-5498

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To link to this item DOI: 10.1039/b900859d

Abstract/Summary

Utilising supramolecular pi-pi stacking interactions to drive miscibility in two-component polymer blends offers a novel approach to producing materials with unique properties. We report in this paper the preparation of a supramolecular polymer network that exploits this principle. A low molecular weight polydiimide which contains multiple pi-electron-poor receptor sites along its backbone forms homogeneous films with a siloxane polymer that features pi-electron-rich pyrenyl end-groups. Compatibility results from a complexation process that involves chain-folding of the polydiimide to create an optimum binding site for the pi-electron-rich chain ends of the polysiloxane. These complementary pi-electron-rich and -poor receptors exhibit rapid and reversible complexation behaviour in solution, and healable characteristics in the solid state in response to temperature. A mechanism is proposed for this thermoreversible healing behaviour that involves disruption of the intermolecular pi-pi stacking cross-links as the temperature of the supramolecular film is increased. The low T-g siloxane component can then flow and as the temperature of the blend is decreased, pi-pi stacking interactions drive formation of a new network and so lead to good damage-recovery characteristics of the two-component blend.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Interdisciplinary centres and themes > Chemical Analysis Facility (CAF)
ID Code:11068
Uncontrolled Keywords:NITROAROMATIC COMPOUNDS, SEQUENCE INFORMATION, RECOGNITION, COMPOSITE, MOLECULES, TWEEZER, NETWORK, PYRENE

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