Sökning: "grafting chemistry"

Visar resultat 21 - 25 av 61 avhandlingar innehållade orden grafting chemistry.

  1. 21. Birch xylan modification by lactide grafting

    Författare :Johanna Persson; Ann-Christine Albertsson; Monica Ek; Mikael Lindström; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The wood based biorefinery concept has led to an increasing interest in the possibility of using hemicelluloses as a source for value added products. Hemicelluloses are dissolved in large amounts in the process liquor during kraft pulping. LÄS MER

  3. 22. 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

  4. 23. Charged Polymers at Spherical Surfaces

    Författare :Anna Akinchina; Fysikalisk kemi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysikalisk kemi; Physical chemistry; Monte Carlo simulation; diblock polyampholyte brushes; polymer brushes; persistent length; stiffness; complexation; macroion; polyelectrolyte; polyion;

    Sammanfattning : Two separate topics in the area of colloidal chemistry have been investigated by the use of molecular modeling: the structural properties of polyion?macroion complexes and of diblock polyampholyte brushes. The main results were obtained by the use of Monte Carlo simulation in the framework of the primitive model, and in the case of polyampholyte brushes the simulation results were also complemented by lattice mean-field calculations. LÄS MER

  5. 24. From Responsive Interfaces to Honeycomb Membranes by Controlled Radical Polymerisation

    Författare :Daniel Nyström; Anders Hult; Søren Hvilsted; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Isoporous membranes; Silica nanoparticles; ATRP; Functional surfaces; cellulose; Polymer chemistry; Polymerkemi;

    Sammanfattning : In this study, surface modification of both organic and inorganic substrates (in terms of cellulose and silica nanoparticles, respectively) has been explored using surface-initiated atom transfer radical polymerisation (ATRP). The desire to modify bio-based materials to fit into new application areas and the need for bio-based materials with improved material properties is steadily increasing due to environmental concern. LÄS MER

  7. 25. Polyhydroxyl and Polyphosphorylcholine functionalized Silica for Hydrophilic interaction liquid Chromatography- Synthesis, characterization and application

    Författare :Nhat Thi Hong Bui; Knut Irgum; Michael Lämmerhofer; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hydrophilic Interaction Chromatography; HILIC; silica; TRIS; acrylamide acrylate; ATRP; iniferter; “controlled living’’ radical polymerization; N; N′-methylenebisacrylamide; MPC; stationary phase; analytisk kemi; Analytical Chemistry;

    Sammanfattning : This thesis focuses on the development of new stationary phases for use in hydrophilic interaction liquid chromatography using TRIS-based and phosphorylcholine typed monomers and porous silica particles as starting substrates. In this thesis, several ways of polymerizing highly hydrophilic mono­mers onto pore surfaces of silica supports are described, based on several “grafting from” schemes. LÄS MER