The article presents the state-of-the-art of alternating physisorption oppositely charged polyelectrolytes, so-called "layer-by-layer" method or "electrostatic self-assembly" (ESA), for preparation thin polymer coatings. In comparison to other, more established self-organization techniques, this recent is distinguished by its simplicity, versatility, and speed. particular, tendency self-healing unique. Emphasis given role molecular structure nature support. Also, various parameters...

Water-soluble block copolymers were prepared from the nonionic monomer N-isopropylacrylamide (NIPA) and zwitterionic 3-[N-(3-methacrylamidopropyl)-N,N-dimethyl]ammoniopropane sulfonate (SPP) by sequential free radical polymerization via RAFT process. Such with two hydrophilic blocks exhibit double thermoresponsive behavior in water: poly-NIPA shows a lower critical solution temperature, whereas poly-SPP exhibits an upper temperature. Appropriate design of lengths leads to which stay full...

The structures and synthesis of polyzwitterions (“polybetaines”) are reviewed, emphasizing the literature past decade. Particular attention is given to general challenges faced, successful strategies obtain polymers with a true balance permanent cationic anionic groups, thus resulting in an overall zero charge. Also, progress due applying new methodologies from polymer synthesis, such as controlled polymerization methods or use “click” chemical reactions presented. Furthermore, emerging...

A wash and brush up: Thermoresponsive biocompatible oligo(ethylene glycol)-based copolymers enable the control of cell adhesion on planar gold substrates. While at physiological temperature, polymer brushes are collapsed fibroblast cultivation, room now hydrated glycol) segments become cell-repellent, thus allowing harvesting under mild conditions (see scheme).

Like a doughnut with raspberry filling: ABC triblock copolymers, composed of hydrophilic block morpholinium units (blue in the picture), hydrophobic hydrocarbon (red), and fluorocarbon-rich (black), self-assemble water to form multicompartment micelles corona core nanometer-scale subdomains.

The absorption characteristics of a large set thiocarbonyl based chain transfer agents (CTAs) were studied by UV-vis spectroscopy in order to identify appropriate conditions for exploiting their absorbance bands end-group analysis polymers prepared reversible addition–fragmentation (RAFT) polymerisation. Substitution pattern and solvent polarity found affect notably the wavelengths intensities π–π*- n–π*-transition bond dithioester trithiocarbonate RAFT agents. Therefore, it is advisable...

Nonionic water-soluble poly(acrylamide)s and poly(acrylate)s were synthesized by RAFT ATRP methods. Similar to the poly(N-isopropylacrylamide) poly(N-acryloylpyrrolidine), aqueous solutions of statistical acrylate copolymers bearing two different oligo(ethylene oxide) side chains showed a sharp clouding transition upon heating beyond characteristic temperatures. The temperature cloud point can be easily fine tuned copolymer composition. As for cloud-point temperatures these are rather...

Ionic liquids based on imidazolium, pyridinium, and alkylammonium salts were investigated as solvents in free radical polymerization of the model monomer n-butyl methacrylate. The properties ionic systematically varied by changing length alkyl substituents cations, employing different anions such tetrafluoroborate, hexafluorophosphate, tosylate, triflate, sulfates dimethyl phosphate. Results compared to analogous polymerizations toluene bulk. have no detectable influence polymer tacticity....

ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTWell-Defined Uncharged Polymers with a Sharp UCST in Water and Physiological MilieuStefan Glatzel†, André Laschewsky†‡, Jean-François Lutz*†§View Author Information† Fraunhofer Institute for Applied Polymer Research, Geiselbergstrasse 69, Potsdam 14476, Germany‡ Department of Chemistry, University Potsdam, Germany*Corresponding author. E-mail: [email protected]§New address: Institut Charles Sadron, UPR-22 CNRS, 23 rue du Loess, BP 84047, 67034...

The widespread occurrence of zwitterionic compounds in nature has incited their frequent use designing biomimetic materials. Therefore, polymers are a thriving field. A particular interest for this polymer class currently focused on establishing neutral, low-fouling surfaces. After highlighting strategies to prepare model surfaces as well those that more suitable practical purposes relying strongly radical polymerization methods, we present recent efforts diversify the structure hitherto...

Dual responsive inverse opal hydrogels were designed as autonomous sensor systems for (bio)macromolecules, exploiting the analyte-induced modulation of opal's structural color. The that are based on oligo(ethylene glycol) macromonomers additionally incorporate comonomers with various recognition units. They combine a coil-to-globule collapse transition LCST type sensitivity temperature toward molecular processes. This enables specific detection macromolecular analytes, such glycopolymers and...

Modulating the thermo-responsive behaviour of poly(sulfobetaine methacrylates) whereby small structural changes cause big effects but show little logic.

The influence of the charge density polyelectrolytes on growth polyelectrolyte multilayers via layer-by-layer self-assembly from pure aqueous solutions was studied. Multilayers were built strong polyanions, namely poly(styrenesulfonate) and an exfoliated synthetic hectorite, cationic copolymers diallyldimethylammonium chloride (DADMAC) with N-methyl-N-vinylformamide (NMVF) for which composition thus varied systematically. analysis system {cationic copolymer/poly(styrenesulfonate)} reveals...

Thermal properties of the novel, double thermosensitive block copolymer, poly(N-isopropyl acrylamide)-block-poly(3-[N-(3-methacrylamido-propyl)-N,N-dimethyl]-ammonio propane sulfonate) (PNIPA-b-PSPP) have been studied in pure and saline (NaCl) aqueous solutions by dynamic laser light scattering. The copolymer [Mn(PNIPA) = 10 800 g/mol Mn(PSPP) 9700 g/mol] exhibits both upper (UCST about 9 °C) lower (LCST 32 critical solution temperatures water. addition NaCl enhances solubility zwitterionic...

Abstract Summary: Multicompartment micelles are complex nanosized systems that possess a hydrosoluble shell and hydrophobic core, which is characterized by segregated incompatible sub‐domains. With roots starting about ten years ago, the field of multicompartment has evolved slowly, until recently when significant achievements have been made. The present article reviews strategies for building such micellar assemblies as well morphological studies, highlights future challenges, discusses...

The second-order nonlinear optical susceptibilities χ(2) of several phenylhydrazone and stilbazium salt dyes in Langmuir–Blodgett monolayers have been determined from second-harmonic-generation measurements. Three the substances demonstrated values greater than 10−6 electrostatic units, although two three did not absorb light significantly at second-harmonic wavelength.

Citrate-capped gold nanoparticles as well planar surfaces can be efficiently grafted with a covalently attached polymer monolayer few nanometers thick, by simple contact of the metal surface dilute aqueous solutions hydrophilic polymers that are end-capped disulfide moieties, shown UV/vis absorption, dynamic light scattering, and plasmon resonance studies. The polymer-coated colloids freeze-dried stored powders subsequently dissolved to yield stable dispersions, even at very large...

Linear amphiphilic diblock and ternary triblock copolymers were synthesized by the RAFT method in three successive steps, using oligo(ethylene oxide) monomethyl ether acrylate, butyl or 2-ethylhexyl 1H,1H,2H,2H-perfluorodecyl acrylate. The copolymers, which consist of a hydrophilic, lipophilic, fluorophilic block, self-assemble water into spherical micellar aggregates. Imaging cryogenic transmission electron microscopy (cryo-TEM) revealed that cores aggregates made from these "triphilic"...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-organization of polymeric lipids with hydrophilic spacers in side groups and main chain: investigation monolayers multilayersA. Laschewsky, H. Ringsdorf, G. Schmidt, J. SchneiderCite this: Am. Chem. Soc. 1987, 109, 3, 788–796Publication Date (Print):February 1, 1987Publication History Published online1 May 2002Published inissue 1 February 1987https://pubs.acs.org/doi/10.1021/ja00237a025https://doi.org/10.1021/ja00237a025research-articleACS...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrophilic spacer groups in polymerizable lipids: formation of biomembrane models from bulk polymerized lipidsR. Elbert, A. Laschewsky, and H. RingsdorfCite this: J. Am. Chem. Soc. 1985, 107, 14, 4134–4141Publication Date (Print):July 1, 1985Publication History Published online1 May 2002Published inissue 1 July 1985https://pubs.acs.org/doi/10.1021/ja00300a007https://doi.org/10.1021/ja00300a007research-articleACS PublicationsRequest reuse...