Sökning: "Polymer Architecture"

Visar resultat 1 - 5 av 55 avhandlingar innehållade orden Polymer Architecture.

  1. 1. Macromolecular design and architecture of aliphatic polyesters

    Författare :Karin Odelius; Ann-Christine Albertsson; Helmut Keul; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ring-opening polymerization; L-lactide; 1; 5-dioxepane-2-one; ε-caprolactone; Polymerization kinetics; Star-shaped architecture; Spirocyclic tin initiator; Polymer chemistry; Polymerkemi;

    Sammanfattning : Public health care has reached a level where tissue or organ reconstruction by means of biodegradable short-term implants via e.g. tissue engineering will be practicable in the near future. LÄS MER

  3. 2. Synthesis, characterization and molecular architecture of electroactive and degradable polymers

    Författare :Baolin Guo; Ann-Christine Albertsson; Anna Finne Wistrand; Ann Cornell; Mark Rutland; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Poly L; L-lactide ; poly ε-caprolactone ; ring-opening polymerization; carboxyl-capped aniline trimer; carboxyl-capped aniline pentamer; coupling reaction; DCC DMAP system; degradability; electroactivity; conductivity; macromolecular architecture; tissue engineering; Polymer chemistry; Polymerkemi;

    Sammanfattning : The third-generation biomaterials are designed to stimulate specific cellular responses at the molecular level. Recent studies have shown that electrical signals regulate cellular activities including cell adhesion, migration, proliferation and differentiation. LÄS MER

  4. 3. Novel methods to synthesize aliphatic polyesters of vivid architectures

    Författare :Rajiv Srivastava; Ann-Christine Albertsson; Ronnie Palmgren; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Polyesters; 1; 5-dioxepan-2-one; Caprolactone; Sn Oct 2; Enzyme; Lipase-CA; Ring-Opening Polymerization; Architecture; Tissue Engineering; Polymer chemistry; Polymerkemi;

    Sammanfattning : Cross-linked films of ε-caprolactone (CL) and 1,5-dioxepan-2-one (DXO) having various mole fractions of monomers and different cross-link densities were prepared using 2,2’-bis-(-caprolactone-4-yl) propane (BCP) as cross-linking agent and Sn(Oct)2 as catalyst. Reaction parameters were examined to optimize the film-forming conditions. LÄS MER

  5. 4. Polymer Nanocomposites in Thin Film Applications

    Författare :Linda Fogelström; Anders Hult; José M. Kenny; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nanocomposites; hyperbranched polymers; montmorillonite; clay nanoparticles; exfoliated; coatings; crosslinking; TEM; XRD; mechanical properties; thermal properties; cellulose nanofibers; Atom Transfer Radical Polymerization; Ring-Opening Polymerization; poly ε-caprolactone ; surface modification; grafting; interfacial adhesion; Polymer chemistry; Polymerkemi;

    Sammanfattning : The introduction of a nanoscopic reinforcing phase to a polymer matrix offers great possibilities of obtaining improved properties, enabling applications outside the boundaries of traditional composites. The majority of the work in this thesis has been devoted to polymer/clay nanocomposites in coating applications, using the hydroxyl-functional hyperbranched polyester Boltorn® as matrix and montmorillonite clay as nanofiller. LÄS MER

  7. 5. Tailoring Surface Properties of Bio-Fibers via Atom Transfer Radical Polymerization

    Författare :Josefina Lindqvist; Eva Malmström; Steven Rannard; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cellulose; bio-fiber; atom transfer radical polymerization; surface modification; grafting; polymer brushes; functional surfaces; superhydrophobic; stimuli-responsive; Polymer chemistry; Polymerkemi;

    Sammanfattning : The potential use of renewable, bio-based polymers in high-technological applications has attracted great interest due to increased environmental concern. Cellulose is the most abundant biopolymer resource in the world, and it has great potential to be modified to suit new application areas. LÄS MER