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Showing 1 to 20 of 24 for “"grafting-from"”.
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Preparation of Fully Miscible Nanocomposites
… conditions allows to attach polymer brushes with grafting densities >1 nm^-2 to inorganic nanoparticles for nearly any nanoparticle/polymer combination using only a few types of binding groups. I demonstrate the potential of the method as an alternative to established grafting-from and grafting-to …
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Functional Cylindrical Polymer Brushes and Their Hybrids with Inorganic Nanoparticles
… polymer brushes were synthesized via a grafting-from strategy. Very long poly(2-hydroxylethyl methacrylate) backbones of the brushes were prepared by anionic polymerization (DPn=1500), esterified with an ATRP initiator, and subsequently the side-chains were grafted by atom transfer …
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Synthesis and Characterization of Graphene-Polymer Nanocomposites via Reversible Addition-Fragmentation Chain-Transfer Polymerization
… a facile approach for growing polymer chains from the surface of graphene sheets via reversible addition-fragmentation chain-transfer (RAFT) polymerization. Graphene oxide was synthesized by reacting graphite with potassium permanganate and concentrated sulfuric acid. The oxidation and …
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Regioselective Design of Polysaccharide Ester Graft Copolymers
… (Ð)). Further structural complications arise from complexities inherent to the polysaccharide backbone, as the presence of pendant functional groups on each monosaccharide result in polymer grafts (and any other substituents present) originating from up to three positions. In order to properly …
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Photochemische Fixierung von Strukturen in Grenzflächen mit polymeren Bürsten
… speziellen Oberflächeninitiator konnten durch „Grafting from“ binäre Polymerbürsten mit bis zu 300 nm Schichtdicke erzeugt werden. Es ist gelungen, diese schaltbaren Schichten durch selektive photochemische Vernetzung einer der Bürstenkomponenten im hydrophilen oder im hydrophoben Zustand zu …
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Design, Synthesis and Application of Cylindrical Polymer Brushes: From Nanostructures to Advanced Materials
… organic/inorganic hybrid nanostructures. The ‘grafting-from’ approach was chosen as the general method to synthesize well-defined CPBs with various chemical and structural compositions. The linear polymer backbones (polyinitiators) were obtained by anionic polymerization or RAFT polymerization, …
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Thermo-responsive Graft Copolymers based on Poly(Methyl Vinyl Ether): from Synthesis to Evaluation
… water-soluble at low temperatures, but separate from these solutions when the temperature is raised above a certain temperature, which is called the cloud point temperature (Tcp). This behaviour is based on the fact that the hydrophilic polymer/water interactions dominate at low temperatures, but …
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Smart magnetic affinity adsorbents
… brushes was achieved by employing two different ‘grafting from’ routes, i.e. cerium (IV) initiated polymerisation and Atom Transfer Polymerisation Reaction (ATRP). By identifying the optimum cerium (IV) reaction conditions, the said chemistry was further utilised to attach different polymers …
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Ring-opening Metathesis Polymerization for the Creation of Responsive Colloids and Surfaces
… 2, photonic ellipsoidal particles are created from the self-assembly of dendronized bottlebrush block copolymers (den-BBCPs), which are synthesized by ROMP. The surface energy of these polymer particles is precisely controlled by the design of surfactants that have selective affinity to each …
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Fabrication and Study of Switchable Polymer Layers with Hydrophobic/Hydrophilic Behavior
… to fabricate mixed polymer brushes: "grafting to" and "grafting from". Mixed PS/PVP polymer brushes were synthesized via step-by-step grafting of these two polymers from polyamide (PA) surfaces. NH3 plasma was used for the introduction of amino and OH functionalities on …
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Synthesis of Bottlebrush Polymers Using the Grafting-Through and Transfer-To Methods
… of these large macromolecules using the grafting-through strategy in the first section and the transfer-to strategy in the second section. For the first time the effect of anchor group chemistry—the configuration of atoms linking the polymer to a polymerizable norbornene—was studied on …
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Understanding the Chemistry and Mechanical Properties of Metal-Organic Framework-Polymer Composites
… linkers, was synthesized with AR ranging from 3.4 to 54. The crystallinity and chemical structure of the MOFs remained consistent for different ARs, ensuring that the AR was the only variable in determining the mechanical reinforcement. Fabricated through the doctor-blade technique, the …
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Self assembled transmembrane protein polymer conjugates for the generation of nano thin membranes and micro compartments
… controlled radical polymerization (CRP) using grafting from technique. These polymers were chosen because they would provide stimuli handles in the resulting membranes. The reported polymerization was the first ever attempt to attach polymer chains onto a membrane protein using site specific …
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Template-Controlled Synthesis of Magnetic/Semiconducting Nanoparticles within Amphiphilic Core-Shell Cylindrical Polymer Brushes
… copolymer side chains were synthesized via the “grafting from” technique using a combination of anionic polymerization (for the synthesis of the backbone) and atom transfer radical polymerization (ATRP, for the synthesis of the side chains). The formation of well-defined brushes was confirmed by …
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One-dimensional hybrid nanomaterials based on cylindrical polymer brushes
… polymerization (for the side chains) via the "grafting from" technique to achieve a narrow molecular weight distribution in both the backbone and the side chains. They were employed as template for the preparation of various types of one-dimensional (1D) polymer-inorganic hybrid nanomaterials. …
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Weak polyacid brushes : synthesis, swelling behavior, complex formation and micropatterning
… triggered by thermal cleavage of the initiator ("grafting from" polymerization). By varying the monomer concentration and the polymerization time, the molecular weight of the surface-attached polymer chains and the anchoring density, a characteristic parameter that determines the degree of chain …
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Towards Mechanical Reinforcement in Polymer Layered Silicates Nanocomposites of the Second Generation
… clay applied in this thesis differs from conventionally used natural montmorillonites (MMT) in respect to three main features: the charge density of the clay and thus the interface chemistry is much more homogeneous and may be adjusted to any desired value. The nanoplatelet diameter …
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Immobilisation von Enzymen auf sphärischen Polyelektrolytbürsten
… auf denen Polymerketten durch eine grafting from-Technik angeknüpft wurden. Sie werden als sphärische Polyelektrolytbürsten bezeichnet. Die Parameter dieser Partikel lassen sich gezielt über die Synthese einstellen. Durch die hohe Oberflächendichte wird ein so genannter brush …
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Branched Glycopolymers
… hyperbranched glycomethacrylates were grafted from a silicon wafer consisting of a covalently attached initiator layer of alpha-bromoester fragments by using SCVCP of a methacrylic inimer, BIEM and sugar-carrying methacrylate monomer, MAIGlc. The thickness and roughness of the resulting …
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Template-Directed Synthesis of One-Dimensional Hybrid Nanostructures from Cylindrical Polymer Brushes
… the sequential growth of side chains via the ‘grafting-from’ approach. Depending upon the desired functional 1D hybrid nanostructures, different combinations of core, shell and corona have been chosen. Core-shell-corona CPBs with a poly(tert-butyl acrylate) (PtBA) core, a poly(3-acryloylpropyl …
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