Sökning: "divinylbenzene"

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet divinylbenzene.

  1. 1. Synthesis and modification of monodisperse polymer particles for chromatography

    Författare :Fredrik Limé; Knut Irgum; Harald D. H: Stöver; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Polymer particles; photoinitiation; precipitation polymerization; styrene; divinylbenzene; atom transfer radical polymerization; liquid chromatography; Analytical chemistry; Analytisk kemi;

    Sammanfattning : Liquid chromatography is an analytical technique that is constantly facing new challenges in the separation of small molecules and large biomacromolecules. Recently the development of ultra high pressure liquid chromatography has increased the demand on sturdy particles as stationary phase. LÄS MER

  3. 2. Porous polymeric materials for chromatography : Synthesis, functionalization and characterization

    Författare :Emil Byström; Knut Irgum; Camilla Viklund; Solomon Tesfalidet; Klaus K Unger; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; porous polymer monolith; pore size distribution; nitrogen sorptiometry; mercury intrusion porosimetry; scanning and transmission electron microscopy; plasma functionalization; Analytical chemistry; Analytisk kemi; Separation methods; Separationsmetoder; Polymer chemistry; Polymerkemi; analytisk kemi; Analytical Chemistry;

    Sammanfattning : Background: Separation science is heavily reliant on materials to fulfill ever more complicated demands raised by other areas of science, notably the rapidly expanding molecular biosciences and environmental monitoring. The key to successful separations lies in a combination of physical properties and surface chemistry of stationary phases used in liquid chromatographic separation, and this thesis address both aspects of novel separation materials. LÄS MER

  4. 3. Synthesis and modifications of materials for separation science

    Författare :Anna Nordborg; Knut Irgum; Michael Lämmerhofer; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; material synthesis; monolith; surface modification; telomer; “grafting to”; gradient polymer elution; chromatography; Chemistry; Kemi;

    Sammanfattning : This thesis deals with the preparation of materials for use in separation science and their surface modification by grafting. The overall aim is the preparation of diverse materials by combination of a set of developed tools. LÄS MER

  5. 4. C-H Activation Reactions Mediated by Pd Based Heterogeneous Catalysts : Regioselective Formation of C-O and C-X Bonds

    Författare :Maitham Majeed; Centrum för analys och syntes; []
    Nyckelord :C-H Activation; N-heterocyclic carbenes; palladium; polymer supported Pd II ; undirected acetoxylation; directed halogenation; continuous flow; reduced graphene oxide supported Pd II ;

    Sammanfattning : New classes of N-heterocyclic carbene-palladium(II) complexes containing either a vinyl group in different positions or an anthracene tag in the backbone of the N-heterocycle were synthesized and fully characterized. The vinyl based complexes were copolymerized with divinylbenzene to fabricate robust polymer-supported NHC-Pd(II) systems, while the anthracene based complexes were π-stacked onto the surface of reduced graphene oxide (rGO) producing immobilized catalysts with interesting features. LÄS MER

  7. 5. Analytical methods for studying polychlorinated naphtalene congener profiles and levels in the Environment

    Författare :Ulf Järnberg; Terry Bidleman; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

    Sammanfattning : This thesis describes the development, refinement and application of analytical techniques in conjunction with other methods for studying the environmental occurrence, distribution and transformation of polychlorinated naphthalenes (PCNs). The procedures involve selective high-performance liquid chromatographic fractionation on a styrene-divinylbenzene gel permeation column and 2-(1-pyrenyl)ethyldimethylsilylated silica column combined with high resolution gas chromatography and low resolution mass spectrometry. LÄS MER