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Hydrogen bonded supramolecular elastomers : correlating hydrogen bonding strength with morphology and rheology

By Philip Woodward, Daniel Hermida-Merino, Barnaby William Greenland, Ian William Hamley, Zoe Light, Andrew Slark and Wayne Hayes

Abstract

A series of six low molecular weight elastomers with hydrogen bonding end-groups have been designed, synthesised and studied. The poly(urethane) based elastomers all contained essentially the same hard block content (ca. 11%) and differ only in the nature of their end-groups. Solution state 1H NMR spectroscopic analysis of model compounds featuring the end-groups demonstrate that they all exhibit very low binding constants, in the range 1.4 to 45.0 M-1 in CDCl3, yet the corresponding elastomers each possess a markedly different nanoscale morphology and rheology in the bulk. We are able to correlate small variations of the binding constant of the end-groups with dramatic changes in the bulk properties of the elastomers. These results provide an important insight into the way in which weak non-covalent interactions can be utilized to afford a range of self-assembled polyurethane based materials that feature different morphologies

Publisher: American Chemical Society
Year: 2010
OAI identifier: oai:centaur.reading.ac.uk:16417

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