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Showing result 1 - 5 of 10 swedish dissertations matching the above criteria.

2. 1. Heterogeneous Degradation and Recyclability of PP Studied by Imaging Chemiluminescence

   Author : Mikael Hamskog; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Teknik; Technological sciences; recyclability; mapping; surface; heterogeneity; heterogeneous; evaporation; ageing; hamamatsu; russel; ICL; CL; Irganox 1010; Irganox 1076; oxidation; hydroperoxide; radical; carbonyl; luminescence; chemiluminescence; imaging chemiluminescence; recycling; stabilization; polypropylene; degradation;

   Abstract : Oxidative degradation is a serious threat to long-term use and recyclability of polymers. Successful recycling of polymeric quality products requires characterization of the polymer material after reprocessing and use. READ MORE

4. 2. Aluminium oxide - poly(ethylene-co-butylacrylate) nanocomposites : synthesis, structure, transport properties and long-term performance

   Author : Patricia Nordell; Ulf Gedde; Lars Wågberg; Minna Hakkarainen; KTH; []
   Keywords : nanocomposite; nanoparticles; aluminium oxide; poly ethylene-co-butyl acrylate ; silanization; dispersion; Irganox 1010; antioxidant; OIT; sorption kinetics; water; nanokomposit; nanopartiklar; aluminium oxid; poly eten-co-butyl akrylat ; silanisering; dispergering; Irganox 1010; antioxidant; OIT; vattenupptag.;

   Abstract : Polymer nanocomposites are promising materials for dielectrical use in high voltage applications and insulations. This work presents a study of nanocomposites based on poly(ethylene-co-butyl acrylate) with two different comonomer compositions and two different aluminium oxide nanoparticles. READ MORE

5. 3. Consumption and loss of commercial stabilisers in polyethylene exposed to different natural environments

   Author : Nadejzda Haider; KTH; []
   Keywords : LDPE; MDPE; ultrasonic extraction; polymer additives; stabilisers; antioxidants; HALS; Irganox 1010; Irgafos 168; migration; consumption; GC-MS; additive degradation products;

   Abstract : A procedure for the extraction and analysis of commercialstabilisers in low density and medium density polyethylene(LDPE and MDPE) films was developed and used to study theconsumption of stabilisers in polymers exposed to differentnatural environments. An ultrasonic technique was applied toextract HALS-3 (Chimassorb 944) from LDPE film and antioxidants(Irganox 1010 and Irgafos 168) from MDPE film. READ MORE

6. 4. Preparation and long-term performance of poly(ethylene-co-butyl acrylate) nanocomposites and polyethylene

   Author : Sohail Nawaz; Ulf Gedde; Mikael Skrifvars; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymer nanocomposite; nanoparticles; aluminium oxide; poly ethylene-co-butyl acrylate ; long-term performance; ageing; antioxidant; OIT; aqueous media; silanization; irganox 1010; deltamethrin; piperonyl butoxide; chlorine dioxide; migration of stabilizer; SRA - Production; SRA - Produktion;

   Abstract : The current study discusses the preparation and long-term performance of polymer composites used for various purposes under different ageing conditions.The first part deals with the preparation and characterization of polymer nanocomposites based on poly(ethylene-co-butyl acrylate) (EBA–13 and EBA–28 with 13 and 28 wt % butyl acrylate, respectively) and 2–12 wt % (0. READ MORE

7. 5. Stabilizers in crosslinked polydimethylsiloxane

   Author : Kamyar Fateh-Alavi; KTH; []
   Keywords : Polymer; Material Science; Polydimethylsiloxane; Stabilizers;

   Abstract : The loss and recovery of the surface hydrophobicity areimportant phenomena when highvoltage insulators, with a shedmaterial composed of polydimethylsiloxane (PDMS), are used. Theloss of hydrophobicity is mostly due to the oxidativecrosslinking which takes place on the PDMS surface duringexposure to electrical discharges, e. g. corona discharges. READ MORE