Supramolecular routes towards liquid crystalline side-chain polymers

Hammond, Michelle; Mezzenga, Raffaele

doi:10.1039/b719672e

Cited by 83 publications

(70 citation statements)

References 90 publications

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“…5,6,[31][32][33][34] In these systems, self-assembly is typically organized on two length scales: that of the side chains and that of the polymers. The most frequently observed structure at the lowest length scale is lamellar, with side-chain layers orientated orthogonally to the higher periodicity flat interfaces.…”

Section: Resultsmentioning

confidence: 99%

Controlling Hierarchical Self-Assembly in Supramolecular Tailed-Dendron Systems

et al. 2010

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We study the self-assembly of a dendritic macromolecular system formed by a secondgeneration dendron with pH-responsive end groups and with a polymer chain emanating from its focal point, typically referred to as dendron-coil system. We use supramolecular ionic interactions to attach to the periphery of the dendrons sulfate-terminated alkyl tails of various lengths. The resulting ionic complexes have a molecular architecture similar to a four-arm dendritic pitchfork with varying arms and holder lengths. The bulk morphologies observed by small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) show thermodynamically stable, hierarchical "inverted" hexagonal or lamellar structures. In addition, for a specific range of volume fractions, we show order-to-order transitions associated with the melting of the crystalline alkyl tails. The structural models for the molecular packing emerging from TEM and SAXS analysis are benchmarked to available self-consistent field theories (SCFTs) developed for identical systems and experiments and theoretical predictions are found in perfect agreement. With respect to our previous work on inverted dendron and dendrimer-surfactant self-assembled morphologies (Mezzenga et al. Soft Matter. 2009, 5, 92-97), the present findings show that keeping the same dendritic molecular architecture but adding a polymer chain emanating from the focal point enables the scale up of the structural organization from the liquid crystalline length scale (10 0 nm) to the block copolymer length scale (10 1 nm) while preserving the inverted unconventional morphologies. Because the length of the holder and the arms of the dendritic pitchfork can be finely tuned, these systems offer new possibilities in the design of nanostructured organic materials and their use in templating applications.

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Section: Resultsmentioning

confidence: 99%

Controlling Hierarchical Self-Assembly in Supramolecular Tailed-Dendron Systems

et al. 2010

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“…127,128 Especially in thin films, additives may lead to interesting new observations, as well as offer a variety of advantages for creating funtional nanomaterials, as will be clarified in this final section.…”

Section: Supramolecular Systemsmentioning

confidence: 99%

Thin films of complexed block copolymers

2009

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Due to their ability to microphase separate into well ordered structures with periodicities on the nanometre scale, block copolymers have received widespread attention as building blocks for the fabrication of nanomaterials. In particular, thin films of block copolymers promise new technological breakthroughs in e.g. computer memory applications. This Review gives a short overview of progress that has been made in preparing suitable thin films of conventional coil-coil diblock copolymer systems, while the advantages as well as the complexities of using more unconventional systems such as triblock copolymers and supramolecular systems are emphasized. Gerrit tenBrinke obtained his PhD in Statistical Physics from the University of Groningen, The Netherlands. He spent two years as a postdoctoral fellow at the University of Massachusetts at Amherst. In 1985 he became Associate Professor in the Polymer Department of the University of Groningen and in 1996 Professor. During 1994-1999 he was also part time Professor at the Helsinki University of Technology working closely together with Olli Ikkala. His research interests are self-assembly in complex polymer systems.

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“…The basic pyridine groups of PS-b -P4VP can form hydrogen bonds with hydrogen donor organic molecules. By using this feature of the P4VP block, works have been reported on modifi cation of the self-assembled structure of such block copolymers [ 24,25 ] and the change of pore sizes in membranes of such block copolymers. [ 26 ] Therefore we attempted to utilize the hydrogen bonding acceptor nature of P4VP block of the block copolymer at the interface of two layers by introducing acidic groups in the support layer material.…”

Section: A Facile Methods To Prepare Double-layer Isoporous Hollow Fibmentioning

confidence: 99%

A Facile Method to Prepare Double-Layer Isoporous Hollow Fiber Membrane by In Situ Hydrogen Bond Formation in the Spinning Line

Noor

Koll

Radjabian

et al. 2015

Macromol. Rapid Commun.

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A double-layer hollow fiber is fabricated where an isoporous surface of polystyrene-block-poly(4-vinylpyridine) is fixed on a support layer by co-extrusion. Due to the sulfonation of the support layer material, delamination of the two layers is suppressed without increasing the number of subsequent processing steps for isoporous composite membrane formation. Electron microscope-energy-dispersive X-ray spectroscopy images unveil the existence of a high sulfur concentration in the interfacial region by which in-process H-bond formation between the layers is evidenced. For the very first time, our study reports a facile method to fabricate a sturdy isoporous double-layer hollow fiber.

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Supramolecular routes towards liquid crystalline side-chain polymers

Cited by 83 publications

References 90 publications

Controlling Hierarchical Self-Assembly in Supramolecular Tailed-Dendron Systems

Controlling Hierarchical Self-Assembly in Supramolecular Tailed-Dendron Systems

Thin films of complexed block copolymers

A Facile Method to Prepare Double-Layer Isoporous Hollow Fiber Membrane by In Situ Hydrogen Bond Formation in the Spinning Line

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