Sökning: "Composite Chitosan -Os-polymer"

Visar resultat 1 - 5 av 12 avhandlingar innehållade orden Composite Chitosan -Os-polymer.

  1. 1. Interfacial Properties of Biomacromolecular Model Systems: Surface Forces and Nanotribology

    Författare :Niklas Nordgren; Mark Rutland; Harry Brumer III; Robert Pelton; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; afm; surface force; friction; composite material; model surface; quartz crystal microbalance; dissipation; cellulose; xyloglucan; chitosan; colloidal probe; nanotribology; biomimetic; enzymatic; polysaccharide; graft; fiber; thiol; spring constant; calibration; lubrication; polyion; responsive.; Surface and colloid chemistry; Yt- och kolloidkemi;

    Sammanfattning : The nanotribology, adhesion and related interfacial properties of biomacromolecular systems have been studied.  The aim was to elucidate the role of physisorbed and chemically grafted bio-polymers implicated as mediators for cellulose based processing and material design. LÄS MER

  3. 2. Exploring Biopolymer-Clay Nanocomposite Materials by Molecular Modelling

    Författare :Yan Wang; Hans Ågren; Vincenzo Carravetta; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; bio-nanocomposite; interfacial mechanism; binding affinity; dimensional stability; counterions; hydration; stress-strain behavior; xyloglucan; chitosan; chitin; molecular dynamics; montmorillonite.; 生物复合材料，界面机理，分子间亲和力，材料尺寸稳定性，抗衡离子，水合作用，应力应变表现， 木葡聚糖，壳聚糖，甲壳素，分子动力学模拟，蒙脱土; bio-nanokompositer; gränsytor; affinitet; dimensionsstabilitet; jonhydrering; spännings-töjningsbeteende; xyloglukan; kitosan; kitin; molekyldynamisk; montmorillonit.; Kemi; Chemistry; Fiber- och polymervetenskap; Fibre and Polymer Science; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : In this thesis, bio-nanocomposites made from two alternative biopolymers and montmorillonite (Mnt) clay have been investigated by molecular modelling. These biopolymers are xyloglucan (XG) and chitosan (CHS), both of which are abundant, renewable, and cost-effective. LÄS MER

  4. 3. From Polysaccharides to Functional Materials for Trace Pharmaceutical Adsorption

    Författare :Zhaoxuan Feng; Minna Hakkarainen; Rojas Orlando J; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Chitosan; cellulose; nanographene oxide; carbon spheres; hydrogel; microsphere; adsorbent; pharmaceutical; microwave; spray-drying; Fiber- och polymervetenskap; Fibre and Polymer Science;

    Sammanfattning : The transition to bioeconomy will reduce our dependency on fossil fuels as well as contribute to a more sustainable society. Within this framework, exploitation and development of renewable substitutes to petroleum-based products provides feasible roadmap for the material design. LÄS MER

  5. 4. Study of Paper Dry Strength Additives on Cellulose Fibres

    Författare :Mengxiao Zhao; Torbjörn Pettersson; Lars Wågberg; Leif Robertsén; Tekla Tammelin; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Paper dry strength additives; adsorption of polymer; polyelectrolyte; birch fibres; model cellulose surface; cellulose beads; filaments; light-weight paper board; polyacrylamide; cationic starch; Torrstyrkekemikalier; polymeradsorption; polyelektrolyter; cellulosafibrer; modellcellulosaytor; cellulosakulor; lättviktsliner; polyakrylamid; katjonstärkelse; Fiber- och polymervetenskap; Fibre and Polymer Science;

    Sammanfattning : Paper packaging is commonly found in the form of paper and cardboard boxes, but recently paper packing is being used in food packaging, trays, beverage packaging and even paper straws, among others. Paper strength additives have been developed to increase the efficiency of the joint strength and the joint areas and potentially maintain bulk in paper products. LÄS MER

  7. 5. Biodegradable nanocomposite films based on amylopectin and chitosan

    Författare :David Nordqvist; Mikael Hedenqvist; Lars Berglund; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Polymer chemistry; Polymerkemi;

    Sammanfattning : The use of disposable material is rapidly increasing, today the absolute majority of the material used for these application, i.e. food packages, are oil-based plastics such as polyethylene and polypropylene. Therefore it is of great importance to find alternative biodegradable materials made from renewable resources for this huge growing market. LÄS MER