University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal

Logo BOKU Resarch Portal

Gewählte Master / Diploma Thesis:

Daniel Ballner (2017): Microfibrillated cellulose-enabled suspension polymerisation of polystyrene.
Master / Diploma Thesis - Institut für Holztechnologie und Nachwachsende Rohstoffe, BOKU-Universität für Bodenkultur, pp 46. UB BOKU obvsg FullText

Data Source: ZID Abstracts
Abstract:
Micro-fibrillated lignocellulose (MFLC), micro-fibrillated cellulose (MFC) and cellulose nanocrystals were suspended in water and mixed with styrene to form oil in water (o/w) emulsions. The stabilisation behaviour was then observed over time. It was assumed that MFLC, because of its comparable high residual lignin content and its amphiphilic behaviour would have a better stabilisation mechanism. In a further step the MFLC and MFC emulsions were polymerised with the radical starter AIBN and heat of 100°C for twelve hours. The result was a cellulose- styrene composite where the MFLC-PS composite showed an even distribution of the fibrils with many polystyrene macrospheres present in the material which were covered completely by fibrils. In contrast the MFC-PS composite was not homogeneous at all and showed parts of pure PS and other parts of aggregated fibrils. No macrospheres could be found in this material. Based on the results of our work it can be concluded that MFLC shows similar emulsion stabilisation behaviour compared to MFC but when it comes to polymerisation MFLC shows superior stabilisation properties which might be due to the presence of lignin in the cellulosic material. The cellulose nanocrystals were not polymerised as no emulsion stabilisation mechanism existed.

Beurteilende(r): Gindl-Altmutter Wolfgang
1.Mitwirkender: Veigel Stefan

© BOKU Wien Imprint