Search for dissertations about: "polymer degradation products"

Showing result 16 - 20 of 66 swedish dissertations containing the words polymer degradation products.

  2. 16. Solid-Phase Microextraction in Polymer Analysis - Extraction of Volatiles from Virgin and Recycled Polyamide 6.6

    Author : Mikael Gröning; Minna Hakkarainen; Stephen Kelley; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemistry; polymer; polyamide 6.6; volatiles; emissions; degradation; quantitation; Kemi; Chemistry; Kemi;

    Abstract : The extraction and quantitative analysis of low molar mass compounds in polymers is an analytical challenge. It is also important from a practical point of view because the low molar mass compounds in time will migrate from the polymers into the surrounding environment. READ MORE

  4. 17. Microwave heating effects on degradation and migration of additives from polypropylene packaging

    Author : Jonas Alin; Minna Hakkarainen; Jiebing Li; Anna Finne Wistrand; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Polymer chemistry; Polymerkemi;

    Abstract : The effect of different food types, polymer qualities and microwaves on the overall and specific migration during microwave heating of plastic packaging was investigated to better understand the packaging-food interactions and the effect of microwaves on food packaging. This work focuses on the migration of chemical compounds to food simulants from commercially available polypropylene packages. READ MORE

  5. 18. Oxidative Degradation of Polyethylene - A Cause of Off-flavour

    Author : Thorbjörn Andersson; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; biopolymers; Polymerteknik; Polymer technology; off-flavour; degradation; polyethylene;

    Abstract : Polyethylene is the most frequently used polymer material in food packaging today. The polymer is often processed by film extrusion and extrusion coating between 250°C and 325°C. READ MORE

  6. 19. Chromatography and extraction techniques for new evaluation methods of polyolefins long-term performance

    Author : Lina Burman; Ann-Christine Albertsson; Marek Kowalczuk; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical engineering; polymer; chromatographic fingerprinting; gas-chromatography – mass spectrometry; GC-MS; degradable polyethylene; prooxidant systems; chemiluminescence; oxidation; degradation mechanisms; accelerated ageing; antioxidants; transformation products; microwave assisted extraction; MAE; solid-phase microextraction; SPME; volatiles; solid phase extraction; SPE; Kemiteknik; Chemical engineering; Kemiteknik;

    Abstract : Chromatography and extraction techniques, and also chemiluminescence have been utilized to develop new rapid and informative tools in the evaluation of long-term properties and environmental effects of polymeric materials. Methods were developed for classification of materials and for early and rapid degradation detection. READ MORE

  7. 20. Degradation of acrylonitrile butadiene rubber and fluoroelastomers in rapeseed biodiesel and hydrogenated vegetable oil

    Author : Shahin Akhlaghi; Ulf W. Gedde; Jean-Luc Gardette; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Degradation; Acrylonitrile butadiene rubber; Fluoroelastomers; Biodiesel; Hydrotreated vegetable oil; Cavitation; Bound rubber; Dehydrofluorination.; Fiber- och polymervetenskap; Fibre and Polymer Science;

    Abstract : Biodiesel and hydrotreated vegetable oil (HVO) are currently viewed by the transportation sector as the most viable alternative fuels to replace petroleum-based fuels. The use of biodiesel has, however, been limited by the deteriorative effect of biodiesel on rubber parts in automobile fuel systems. READ MORE