Extrusion processing of green biocomposites: Compounding, fibrillation efficiency, and fiber dispersion

Document identifier: oai:DiVA.org:ltu-7754
Access full text here:10.1002/app.39981
Keyword: Engineering and Technology, Industrial Biotechnology, Bio Materials, Teknik och teknologier, Industriell bioteknik, Biomaterial, Trä och bionanokompositer, Wood and Bionanocomposites
Publication year: 2014
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructure
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

The efficiency of twin-screw extrusion process to fibrillate cellulose fibers into micro/nanosize in the same step as the compounding of green bionanocomposites of thermoplastic starch (TPS) with 10 wt % fibers was examined. The effect of the processing setup on micro/nanofibrillation and fiber dispersion/distribution in starch was studied using two types of cellulose fibers: bleached wood fibers and TEMPO-oxidized cellulose fibers. A composite with cellulose nanofibers was prepared to examine the nanofiber distribution and dispersion in the starch and to compare the properties with the composites containing cellulose fibers. Optical microscopy, scanning electron microscopy, and UV/Vis spectroscopy showed that fibers were not nanofibrillated in the extrusion, but good dispersion and distribution of fibers in the starch matrix was obtained. The addition of cellulose fibers enhanced the mechanical properties of the TPS. Moisture uptake study revealed that the material containing TEMPO-oxidized fibers had higher moisture absorption than the other composites

Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructure
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

The efficiency of twin-screw extrusion process to fibrillate cellulose fibers into micro/nanosize in the same step as the compounding of green bionanocomposites of thermoplastic starch with 10wt% fibers was examined. The effect of the processing set-up on micro/nanofibrillation and fiber dispersion/distribution in starch was studied using two types of cellulose fibers: bleached wood fibers and TEMPO-oxidized cellulose fibers. A composite with cellulose nanofibers was prepared to examine the nanofiber distribution and dispersion in the starch and to compare the properties with the composites containing cellulose fibers. Optical microscopy, scanning electron microscopy and UV/Vis spectroscopy showed that fibers were not nanofibrillated in the extrusion, but good dispersion and distribution of fibers in the starch matrix was obtained. The addition of cellulose fibers enhanced the mechanical properties of the thermoplastic starch. Moisture uptake study revealed that the material containing TEMPO-oxidized fibers had higher moisture absorption than the other composites.

Authors

Maiju Hietala

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Pierre Rollo

LTU
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Kaarina Kekäläinen

Fibre and Particle Engineering Laboratory, Department of Process and Environmental Engineering, University of Oulu
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Kristiina Oksman

Luleå tekniska universitet; Materialvetenskap
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