Search for dissertations about: "stereocomplex"

Found 4 swedish dissertations containing the word stereocomplex.

  2. 1. Controlling Polylactide Degradation through Stereocomplexation and Lactic Acid Based Additives

    Author : Sofia Regnell Andersson; Minna Hakkarainen; Ann-Christine Albertsson; Marek Kowalczuk; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Polylactide; stereocomplex; plasticizer; degradation; degradation products; ESI-MS;

    Abstract : The successful use of degradable materials in new applications depends on our ability to control the degradation process. A number of aspects need to be evaluated including degradation rate, the onset of degradation and the nature, formation and release of degradation products. READ MORE

  4. 2. Graphene Oxide Technology to Advance the Performance of Poly(lactic acid) Materials

    Author : Huan Xu; Minna Hakkarainen; Jean-Marie Raquez; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Poly lactic acid ; Graphene Oxide; Stereocomplex; Nucleation Mechanism; Crystalline Morphology; Filler Structure; Mechanical Properties; Gas Barrier; Teknisk materialvetenskap; Materials Science and Engineering;

    Abstract : In the past two decades, a burgeoning biorefinery concept has grown in concert with the materials science, contributing to the rise of biobased materials that respect environment and are versatile for various applications. An excellent example is poly(lactic acid) (PLA) that exhibits high strength and desirable degradability. READ MORE

  5. 3. Towards a retro-structural design of degradable aliphatic polyester-based materials

    Author : Veluska Arias; Ann-Christine Albertsson; Minna Kellomäki; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Hydrolysis; polyesters; polylactide; hydrophobicity; crystallinity; miscibility; nanoparticles; stereocomplex; homocomposites; Kemi; Chemistry;

    Abstract : The increasing amount of accumulated plastic waste has led to a continuous search for degradable materials for use in a variety of applications. This eco-friendly approach contemplates the use of degradable alternatives to the inert polymers (the main components in plastics) used today and further engineering of their degradation pathways. READ MORE

  6. 4. Tuning the polylactide hydrolysis rate without introducing new migrants

    Author : Sofia Regnell Andersson; Minna Hakkarainen; Karin Jacobson; Ulrika Edlund; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; polylactide; sterocomplex; plasticizer; degradation; degradation products; ESI-MS; Biochemistry; Biokemi; Polymer chemistry; Polymerkemi;

    Abstract : The possibility to control and tune the hydrolytic degradation rate of polylactide without introducing any new degradation products was investigated by subjecting polylactide with cyclic or linear oligolactic acid additives, and a stereocomplex between the L- and D-enantiomers of polylactide to hydrolytic degradation at 37 and 60 °C for up to 39 weeks. The degradation was monitored by measuring mass loss, molar mass changes, water uptake, changes of surface structure, crystallinity and thermal properties. READ MORE