Extruded binary foam biocomposites
Rokkonen, Teijo (2017)
Rokkonen, Teijo
2017
Materiaalitekniikka
Teknisten tieteiden tiedekunta - Faculty of Engineering Sciences
This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.
Hyväksymispäivämäärä
2017-05-03
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201704121299
https://urn.fi/URN:NBN:fi:tty-201704121299
Tiivistelmä
Wood fiber polymer composites are gaining industrial interest due to environmentally beneficial properties compared to glass or carbon fiber composites, while still exhibiting good physical and mechanical properties. However, wood fiber composites have several drawbacks. For example, drilling and nailing are challenging and they have higher density compared to solid wood. Many of these drawbacks can be overcome with foaming. Foaming produces a cellular structure to the material. This thesis is part of a project where the aim is to develop a new kind of polymer foam structure for wood fiber polymer composites. The concept is built on selective foaming of one polymer component in an immiscible binary polymer blend. The unfoamed phase is a wood fiber polymer composite, while the other phase is a pure polymer undergoing foaming. With this structure, the fibers would bring good mechanical properties in the solid phase but with the added benefit of foamed domains. The structure is meant to be produced with extrusion foaming. In this thesis, preliminary research and experiments have been made for that project.