Search for dissertations about: "Blowing agent"

Showing result 6 - 10 of 10 swedish dissertations containing the words Blowing agent.

2. 6. On the production of polyethylene dielectrics and conductive polymer composite fibres

   Author : Martin Strååt; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; polyethylene; carbon black; polypropylene; melt spinning; foaming; polystyrene; fibres; cables; carbon nanotubes; electrical properties;

   Abstract : Foamed cable insulations and conductive polymer composite fibres are two applications in polymer processing where the electrical properties of a material may be altered significantly during processing. Their common denominator is that the outcome depends to a large degree on the flow behaviour of the polymer melt, in particular the melt extensional properties. READ MORE

4. 7. Long-Term Thermal Performance of Polyurethane-Insulated District Heating Pipes

   Author : Maria E. Olsson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : The distribution of hot water in district heating pipes gives rise to energy losses. In order to minimise heat losses and maintain a high water temperature most district heating pipes produced today are insulated with rigid polyurethane foam. READ MORE

5. 8. On the Dielectric Losses of Polyethylene at Medium and High Frequencies

   Author : Martin Strååt; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Dielectric properties; foaming; crystallinity; polyethylene; frequency; porosity;

   Abstract : AbstractAs mobile communication moves from 3G to 4G, the bandwidth used will be extended from 2 GHz to 5 GHz. The propagation loss is related to the 2.6:th power of frequency, thus a large increase in power consumption may be expected. READ MORE

6. 9. Environmental and Thermal Performance of District Heating Pipes

   Author : Morgan Fröling; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; district heat distribution; cyclopentane; district heating pipe; long-term thermal performance; life cycle assessment; insulation; polyurethane foam; environmental performance; carbon dioxide; HFC-365mfc;

   Abstract : In order to move towards a sustainable society we need to increase the efficiency of our use of available resources, not only in economic terms but also in ecological terms. District heating, the utilisation of centrally produced heat for space heating and domestic hot water generation, has the potential to contribute to the eco-efficient use of energy resources in the parts of the world where space heating is needed. READ MORE

7. 10. Improving properties of poly(lactic acid) biopolymer for use in food packaging

   Author : Mitul Kumar Patel; Kristiina Oksman; Mohini Sain; Marc Delgado Aguire; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; biopolymer; poly lactic acid ; chitin nanocrystals; barrier properties; liquid assisted extrusion; Trä och bionanokompositer; Wood and Bionanocomposites;

   Abstract : The petroleum-based plastics are widely used for food packaging applications because of their low cost, easy processability, and tunable properties to meet the specific needs of food packaging. However, these polymers are non-biodegradable, leading to a substantial amount of plastic waste in both land and marine ecosystems. READ MORE