Sökning: "polystyrene"

Visar resultat 1 - 5 av 120 avhandlingar innehållade ordet polystyrene.

1. 1. On Defect Generation and the Appearance of Injection-Moulded Polymers

   Författare :Francesco Pisciotti; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; colour; gloss; ageing; rheology; defect; mechanical properties; surface topography; recycling; polypropylene; injection moulding; mass spectroscopy; simulation; polystyrene;

   Sammanfattning : This thesis addresses the generation of some important manufacturing defects associated with intrinsic limitations of the injection moulding process. These include bulk-surface structural discontinuities, particularly air traps and welds, bulk-surface compositional inhomogeneities and gloss and colour variations. LÄS MER

3. 2. Preparation and Compatibilizing Properties of Poly(styrene-graft-ethylene oxide) in Polymer Blends

   Författare :Patric Jannasch; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Anionic Polymerization of Ethylene Oxide; Polystyrene; Polymer technology; biopolymers; Polymerteknik; Ethoxylation; Grafting; Poly styrene-graft-ethylene oxide ; Crystallization; Interphases; Macrophases; Poly butyl acrylate ; Compatibilization of Polymer Blends; Polyamide;

   Sammanfattning : One of the main trends in the polymer industry today is the increasing importance of polymer blends. Combining two or more immiscible polymers in a polymer blend often leads to multi-phase materials with desirable properties. LÄS MER

4. 3. Understanding hazards of nanoplastics using Daphnia magna

   Författare :Egle Kelpsiene; NanoLund: Centre for Nanoscience; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Daphnia magna; nanoplastics; polystyrene; polylactic acid nanoparticles;

   Sammanfattning : This thesis presents the results of studies focused on effects caused by nano-sized particles using freshwater filter feeder Daphnia magna. I showed that both positively and negatively surface charged PS NPs induced significant mortality in D. magna after a life-time (103 days) of exposure at low concentrations. LÄS MER

5. 4. Polymer Ionic Materials: A Study of new Materials for Solid Polymer Fuel Cells and Rechargeable Polymer Batteries

   Författare :Britta Mattsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; PPO; polystyrene; neutron scattering; poly propylene oxide ; PEO; polymer electrolytes; poly vinylidene fluoride ; poly ethylene oxide ; luminescence; Raman spectroscopy; proton conducting polymer; poly styrene sulfonic acid ; PVDF;

   Sammanfattning : Ion-containing polymeric materials are interesting for use in a wide variety of applications, where the flexible, yet mechanically stable, polymer matrix is essential. Intensive research is presently going on worldwide for applications as electrolytes in solid polymer batteries and fuel cells, where the ion-conducting polymer also serves as an electrode separator. LÄS MER

7. 5. The glass transition and dynamics of thin polymer films

   Författare :Johan Mattsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Brillouin light scattering; polymer dynamics; QCM; thin films; glass transition; confinement; cooperativity; polystyrene;

   Sammanfattning : .... LÄS MER