Sökning: "blowing agents"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden blowing agents.

  1. 1. Blowing Agents in Rigid Polyurethane Foam - Analytical Studies - Technical and Environmental Aspects

    Författare :Magdalena Svanström; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; insulation; ageing; district heating pipes; cyclopentane; CFC-11; carbon dioxide; diffusion; blowing agents; polyurethane foam;

    Sammanfattning : Rigid polyurethane foam is used in many different applications because of its high insulating capacity. CFC-11 has been the predominant blowing agent due to its advantageous properties, especially its low thermal conductivity. LÄS MER

  3. 2. HFC-365mfc and cyclopentane as blowing agents in polyurethane insulation of distric heating pipes

    Författare :Sara Mangs; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; 1; 3-pentaflurorbutane; cyclopentane; diffusion; thermal performance; 1; rigid polyurethane foam; twin pipe; 3; HFC-365mfc; 1; district heating;

    Sammanfattning : .... LÄS MER

  4. 3. Foaming of Some Cellulose Derivatives - Initial Studies

    Författare :Kristina Karlsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rheological characterisation; Foaming; hydroxypropyl methylcellulose HPMC ; scale-up production; ethyl hydroxyethyl cellulose EHEC ; hot-mould baking; cellulose derivatives; extrusion;

    Sammanfattning : Fossil-based polymeric foams, based on polymers such as polystyrene and polyurethane, are important and widely employed materials due to their good mechanical properties relative their low density, the low price and the possibility for large-scale production. There are however a few disadvantages with these foamed products. LÄS MER

  5. 4. Insulation materials in district heating pipes : Environmental and thermal performance of polyethylene terephthalate and polyurethane foam

    Författare :Sara Mangs; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; HFC-365mfc; insulation; District heating pipe; 3-pentafluorobutane; cyclopentane; 3; 1; mass transport; 1; 1; thermal performance; polyurethane foam; polyethylene terephthtalate foam;

    Sammanfattning : District heating can contribute to increased energy efficiency in society. The environmental impact can be reduced by minimising the heat losses in the district heating pipes during distribution of the heat to the customers. LÄS MER

  7. 5. Foaming of cellulose derivatives and hemicellulose-containing materials

    Författare :Kristina Karlsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; β-glucan; arabinoxylan; scale-up production; hydroxypropyl methylcellulose HPMC ; ethyl hydroxyethyl cellulose EHEC ; hot-mould foaming; extensional viscosity; extrusion; hemicellulose; rheological characterisation; Foaming; xylan; cellulose derivatives;

    Sammanfattning : Fossil-based polymeric foams are important materials due to their good mechanical properties relative their low density, the low price and the possibility for large-scale production. They are widely used in cushioning, absorbing and insulation applications. There are however a few disadvantages with these foamed products. LÄS MER