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Showing 1 to 20 of 46 for “"Comonomers"”.
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Improvements in catalysis for the copolymerization of ethylene with polar comonomers
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Incorporation of Polar Comonomers Into High Density Polyethylene With a Cyclopentadienyl-Amido Titanium Catalyst
… rates (8.0 mol%) of all three of the polar comonomers. The two shorter comonomers exhibited no incorporation at all. This confirmed the hypothesis that polar comonomers with longer chains would be less prone to poisoning the electrophilic catalyst.
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Morphology, Crystallization and Melting Behavior of Statistical Copolymers of Propylene with Ethylene, 1-Butene, 1-Hexene and 1-Octene
… the expectations that the ethylene and butene comonomers are partly included in the propylene lattice. Propylene/1-hexene and propylene/1-octene copolymers exhibit remarkably similar behavior and morphologies consistent with the expectations that the hexene and the octene comonomers are …
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Cokulturtestsystem für die Untersuchung des Einflusses physikochemischer Eigenschaften von Copolymeren auf das Verhalten von Keratinozyten und Fibroblasten
… Eigenschaften durch Art und molaren Anteil des Comonomers eingestellt werden können. Durch Variation des molaren Anteils der Comonomere mit positiver bzw. negativer Ladung, Methacrylsäure-2-aminoethylester-hydrochhlorid (AEMA) und N-3-Aminopropyl-methacrylamid-hydro-chlorid (APMA) bzw. …
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Tailoring Fluorene-based Oligomers for micron and sub-micron sized Photopatterning
… and fluorene cooligomers incorporating various comonomers for adjusting the conductive properties towards electron and hole conduction. Since possible applications for these materials feature organic light emitting diodes and organic field effect transistors we focused on the preparation of …
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Simplified Synthesis of Conjugated Polymers Enabled via 1,4-Dihydropyrrolo[3,2-b]pyrrole
… with electron-rich and electron-deficient comonomers. Through the choice of comonomers, H<sub>2</sub>DPP polymers demonstrate facile optical tunability, evident by absorbance and fluorescence across the visible spectrum. Additionally, polymers demonstrate suitable thermal stability for …
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Synthese, Charakterisierung und thermischer Abbau von Copolymeren aus THF und funktionalisierten Oxiranen
… kationic ring-opening copolymerization. Oxirane comonomers used were ethylene oxide, propylene oxide, alkylglycidyl ethers, alkyl 3,4-epoxybutanoate and glycidyl acetate. Copolymers with different ranges of composition and different microstruktures were synthesized. The thermal degradation of the …
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Studies of Conjugated Small Molecules, Polymers and Organic-Inorganic Hybrid Materials for Photovoltaic Applications
… bithiophene units with different comonomers have been synthesized. Due to the electron-donating properties of the alkoxy substituents and the near planar structure of the bithiophene unit, conjugated polymers containing 3,3’-dialkoxy bithiophene units show strong propensity towards …
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Functionalisation of polymers: reactive processing, structure and performance characteristics
… aim of this work was to study the effect of two comonomers, trimethylolpropane trimethacrylate (TRIS) and divinylbenzene (DVB) on the nature and efficiency of grafting of two different monomers, glycidyl methacrylate (GMA) and maleic anhydride (MA) on polypropylene (P) and on natural rubber (NR) …
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Selective ethylene dimerization by a nickel-exchanged metal-organic framework catalyst
… valuable commodity chemicals due to their use as comonomers in linear low-density polyethylene. Presently only homogeneous systems are used to catalyze ethylene dimerization in industry, causing many to suffer from quick deactivation and poor selectivity. The metal-organic framework (MOF) CPF-5 …
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Design and Synthesis of Stimuli-Responsive Polymers with Programmable Cleavability
… introducing a novel approach to cleavable comonomers for improving plastic end-of-life sustainability. The fourth chapter thus provides detailed background on the current plastic waste outlook, vinyl polymers and their synthesis, radical ring-opening polymerization, and current approaches …
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Sterically Crowded Copolymers Based on Functionalized Stilbenes
… polyelectrolytes based on substituted stilbene comonomers. New sterically crowded polyelectrolytes based on functionalized stilbenes with maleic anhydride or functionalized N-phenylmaleimides were prepared via a "protected" precursor polymer strategy. The polyelectrolyte precursors readily …
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Synthesis and characteristics of polyarylene ether sulfones
… one step process, where the intermonomer and/or comonomers had independent functional group reactivities, the resulting copolymer was always random irrespective of the reactivity ratio of the comonomers. A non random distribution was obtained when the reactivity ratio of the funtional groups in …
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Synthesis and Characterization of Linear and Crosslinked Sulfonated Poly(arylene ether sulfone)s: Hydrocarbon-based Copolymers as Ion Conductive Membranes for Electrochemical Systems
… of di-sulfonated and non-sulfonated comonomers with bisphenol monomers. In systematic investigations, a series of copolymers with modified properties were synthesized and characterized by changing the ratio of the sulfonated/non-sulfonated comonomers in each reaction. These copolymers …
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Preparation of Fully Miscible Nanocomposites
… available copolymers with functional comonomers can be used for stable ligand exchange, demonstrating the versatility and broad potential of the method.
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New inverse opal hydrogels as platform for detecting macromolecules
… A, were studied by incorporating functional comonomers of benzoboroxole, biotin and mannose into the copolymers. The incorporated recognition units specifically bind to certain low and highmolar mass biomolecules, namely to certain saccharides, catechols, glycopolymers or proteins. Their …
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Design and synthesis of new processable materials for application in organic devices.
… glycol (Teg) side chains and different comonomers including vinyl, ethylhexyloxy benzodithiophene or functionalized thiophene ring. The majority of materials were synthesized using the Stille condensation reaction, but also an environmentally friendly process, the Direct Heteroarylation …
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Characterization of Structure-Property Relationships in Hydrophilic-Hydrophobic Multiblock Copolymers for Use in Proton Exchange Membrane Fuel Cells
… synthesized by copolymerizing various aromatic comonomers, but the smaller ion channels prohibit rapid proton transport under partially hydrated conditions. One solution has been to synthesize multiblock copolymers from hydrophilic and hydrophobic oligomers to ensure sufficient ion channel size. …
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Synthesis and Solution Properties of Semi-rigid Polyelectrolytes and Polyampholytes
… in an alternating fashion with acceptor comonomers such as maleic anhydride and maleimide. These sterically crowded polymer backbones are classified as semi-rigid. As this is an uncommon category of polymer backbone rigidity, examples of semi-rigid and rigid polyzwitterions in the …
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