Abstract
We describe the generation of supramolecular polyurethanes and the positive effect that chirality has upon the physical properties of these materials.
Highlights
Supramolecular polymers[1,2,3] represent a rich and diverse field of polymer research, developing the design and manipulation of molecular interactions and information through highly specific and directional recognition processes to generate selfassembled arrays in a controlled and spontaneous fashion.[4,5]Supramolecular polymers can have a wide variety of structures, ranging from simple guest–host systems to complex selfassembled supramolecular objects, crystalline networks, and monolayers.[5,6,7] These materials are comprised typically of lowmolecular weight species which are able to form a pseudo-high molecular weight polymer network with attractive physical properties.[8,9] The switchable nature of supramolecular polymers has been investigated for a wide range of potential applications[3] including adhesives,[10,11,12] surface-coatings,[13] biomedical materials,[14,15] healable materials,[9,16,17,18,19] inkjet and 3D printing.[20,21,22] As a consequence of the highly addressable assembly motifs, supramolecular polymers[23] offer a route to novel materials and properties which can be processed4488 | Polym
In order to understand the effect of chiral centres located in the recognition motifs of supramolecular polyurethanes on their self-assembly polymers, (SPUs 1–3) were first synthesised using a one-pot, two-step procedure.[55]
To allow focus on the physical properties arising as a consequence of the chirality of the end-groups which assemble within the hard segment phase, a polyol and diisocyanate were selected with predictable contributions to the self-assembly process
Summary
Supramolecular polymers[1,2,3] represent a rich and diverse field of polymer research, developing the design and manipulation of molecular interactions and information through highly specific and directional recognition processes to generate selfassembled arrays in a controlled and spontaneous fashion.[4,5]Supramolecular polymers can have a wide variety of structures, ranging from simple guest–host systems to complex selfassembled supramolecular objects, crystalline networks, and monolayers.[5,6,7] These materials are comprised typically of lowmolecular weight species which are able to form a pseudo-high molecular weight polymer network with attractive physical properties.[8,9] The switchable nature of supramolecular polymers has been investigated for a wide range of potential applications[3] including adhesives,[10,11,12] surface-coatings,[13] biomedical materials,[14,15] healable materials,[9,16,17,18,19] inkjet and 3D printing.[20,21,22] As a consequence of the highly addressable assembly motifs, supramolecular polymers[23] offer a route to novel materials and properties which can be processed4488 | Polym. We report the use of this chiral recognition motif as an end-group in supramolecular polyurethanes (SPUs) and examine how the highly directional stereochemistry of the self-assembly motif enhances the phase separated morphology and improves the mechanical properties of the resulting materials.
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