Search for dissertations about: "Polylactic acid"

Showing result 1 - 5 of 7 swedish dissertations containing the words Polylactic acid.

  1. 1. Processing and properties of nanocomposites based on polylactic acid, chitin and cellulose

    University dissertation from Luleå : Luleå University of Technology

    Author : Natalia Herrera Vargas; Luleå tekniska universitet.; [2017]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nanocomposite; Cellulose; Chitin; Extrusion; Polylactic acid; Trä och bionanokompositer; Wood and Bionanocomposites;

    Abstract : The production of bio-based and biodegradable nanocomposites has gained attention during recent years for environmental reasons; however, the large-scale production of these nanocomposites still poses challenges. The objective of this work has been to prepare bio-based and biodegradable nanocomposites via liquid-assisted extrusion and to gain a deeper understanding of the process and the relationship between the process, composition, structure and properties. READ MORE

  2. 2. Protein-based packaging films, sheets and composites : process development and functional properties

    University dissertation from Skolan för kemivetenskap, Kungliga Tekniska högskolan

    Author : Sung-Woo Cho; KTH.; Högskolan i Borås.; [2009]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TECHNOLOGY Chemical engineering Other chemical engineering; TEKNIKVETENSKAP Kemiteknik Övrig kemiteknik; wheat gluten; solution casting; compression molding; extrusion; injection molding; aging; migration; opacity; heat sealability; hemp fiber; laminate; polylactic acid; clay; nanocomposites.; nanocomposites; Energi och material;

    Abstract : The depletion of the petroleum resources and a number of environmental concerns led to considerable research efforts in the field of biodegradable materials over the last few decades. Of the diverse range of biopolymers, wheat gluten (WG) stands out as an alternative to synthetic plastics in packaging applications due to its attractive combination of flexibility and strength, high gas barrier properties under low humidity conditions and renewability. READ MORE

  3. 3. Physical, Chemical and Biochemical Modifications of Industrial Softwood Kraft Lignin for Different Applications

    University dissertation from KTH Royal Institute of Technology

    Author : Miao Wang; KTH.; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Kemi; Chemistry;

    Abstract : Various technical lignins, e.g. industrial Softwood Kraft lignin (SKL), are now largely available while they are generally underutilized due to their heterogeneous and complicated structures and/or the poor properties. READ MORE

  4. 4. Processing and Properties of Nanostructured Biocomposites

    University dissertation from Luleå tekniska universitet

    Author : Natalia Herrera Vargas; Luleå tekniska universitet.; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Trä och bionanokompositer; Wood and Bionanocomposites;

    Abstract : In this work, nanostructured biocomposite fibers and films with cellulose nanofibers (CNF), cellulose nanocrystals (CNC) and chitin nanocrystals (ChNC) were prepared using solutions mixing followed by electrospinning and melt compounding. The main processing challenges for these materials were to find parameters for: 1) fiber alignment in electrospinning, 2) feeding the nanomaterials into the extruder and 3) dispersion and distribution of the nanomaterials in the polymeric matrix. READ MORE

  5. 5. Processing of continuous fibers based on nanocellulose: Influence of dispersion and orientation on mechanical properties

    University dissertation from Luleå tekniska universitet

    Author : Saleh Hooshmand; Luleå tekniska universitet.; [2016]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Trä och bionanokompositer; Wood and Bionanocomposites;

    Abstract : The aim of the work was to prepare continuous bio-based fibers where nano-sized cellulose was used to improve the mechanical properties. Two different strategies were used to reach this aim, melt-spinning of thermoplastic fibers reinforced with nanocellulose and dry-spinning of cellulose nanofibers without solvent or chemicals. READ MORE