Journal ArticleDOI
Controlling polymer shape through the self-assembly of dendritic side-groups
Virgil Percec,Cheol Hee Ahn,Goran Ungar,Duncan J. P. Yeardley,Martin Möller,Sergei S. Sheiko +5 more
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In this article, the authors report a general strategy for the rational control of polymer conformation through self-assembly of quasi-equivalent monodendritic (branched) side-groups attached to flexible backbones.Abstract:
The chain conformation of polymers plays an important role in controlling their phase behaviour and associated material properties In the case of flexible polymers, conformation is controlled by the degree of polymerization (DP), with low-DP polymers having extended polymer chains and high-DP polymers adopting random-coil conformations in solution and the bulk amorphous state1, and folded conformations in the crystalline phase2 Exceptions to this general rule are polymers that contain structurally rigid building blocks, or that are subjected to directional shear forces during solidification The backbones of semi-flexible and rigid rod-like polymers, for example, are always extended in liquid crystalline and crystalline phases3,4,5, and gel-spun flexible polymers form extended-chain crystals2 Here we report a general strategy for the rational control of polymer conformation through the self-assembly of quasi-equivalent monodendritic (branched) side-groups attached to flexible backbones At low DPs, the conical monodendrons assemble to produce a spherical polymer with random-coil backbone conformation On increasing the DP, the self-assembly pattern of the monodendritic units changes to give cylindrical polymers with extended backbones This correlation between polymer conformation and DP is opposite to that seen in most synthetic and natural macromolecules We anticipate that our strategy will provide new approaches for the rational design of organized supramolecular materials6,7,8,9 in areas such as nanotechnology, functional films and fibres, molecular devices, and membranes, expanding the synthetic and technological uses of dendritic building blocks7,10,11,12,13,14,15read more
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Journal ArticleDOI
Quantification of modelling uncertainties in a large ensemble of climate change simulations
James M. Murphy,David M. H. Sexton,David N. Barnett,Gareth S. Jones,Mark J. Webb,Matthew Collins,David A. Stainforth +6 more
TL;DR: A systematic attempt to determine the range of climate changes consistent with these uncertainties, based on a 53-member ensemble of model versions constructed by varying model parameters, which produces a range of regional changes much wider than indicated by traditional methods based on scaling the response patterns of an individual simulation.
Journal ArticleDOI
Convergent Dendrons and Dendrimers: from Synthesis to Applications
Journal ArticleDOI
Platinum Group Organometallics Based on “Pincer” Complexes: Sensors, Switches, and Catalysts
Martin Albrecht,Gerard van Koten +1 more
TL;DR: This review discusses the synthetic methodologies that are currently available for the preparation of platinum group metal complexes containing pincer ligands and especially emphasizes different applications that have been realized in materials science such as the development and engineering of sensors, switches, and catalysts.
Journal ArticleDOI
Peptide-amphiphile nanofibers: A versatile scaffold for the preparation of self-assembling materials
TL;DR: The scope of amino acid selection and alkyl tail modification in the peptide-amphiphile molecules are investigated, yielding nanofibers varying in morphology, surface chemistry, and potential bioactivity, demonstrating the chemically versatile nature of this supramolecular system.
Journal ArticleDOI
Synthetic helical polymers: conformation and function.
Tamaki Nakano,Yoshio Okamoto +1 more
References
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MonographDOI
Supramolecular Chemistry: Concepts and Perspectives
TL;DR: From molecular to supramolescular chemistry: concepts and language of supramolecular chemistry, molecular recognition, information, complementarity molecular receptors - design principles and more.
Journal ArticleDOI
Functional polymers and dendrimers: reactivity, molecular architecture, and interfacial energy
TL;DR: The interaction of polymers with their environment depends largely on the functional groups they carry and the placement of functional groups at polymer chain ends or in well-defined segments can determine the ultimate properties.
Journal ArticleDOI
Direct Visualization of Individual Cylindrical and Spherical Supramolecular Dendrimers
Steven D. Hudson,Hannes Jung,Hannes Jung,Virgil Percec,Virgil Percec,Wook-Dong Cho,Wook-Dong Cho,Gary Johansson,Gary Johansson,Goran Ungar,Goran Ungar,Venkatachalapathy S. K. Balagurusamy,Venkatachalapathy S. K. Balagurusamy +12 more
TL;DR: In this article, the stiffness of cylindrical supramolecular dendrimers was evaluated by examining their planar texture and its defects, showing that they are self-assembled, self-organized, and aligned spontaneously and simultaneously in hexagonal columnar or cubic thermotropic liquid-crystal phases with high uniformity.