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):

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):

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

Other publications >>

Pierre Rollo

LTU
Other publications >>

Kaarina Kekäläinen

Fibre and Particle Engineering Laboratory, Department of Process and Environmental Engineering, University of Oulu
Other publications >>

Kristiina Oksman

Luleå tekniska universitet; Materialvetenskap
Other publications >>

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        identifier: oai:DiVA.org:ltu-7754
        datestamp: 2021-04-19T12:20:48Z
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                recordCreationDate: 2016-09-29
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                http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-7754
                10.1002/app.39981
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            titleInfo: 
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                    lang: eng
                title: Extrusion processing of green biocomposites: Compounding fibrillation efficiency and fiber dispersion
            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

                
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.

            subject: 
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                        lang: eng
                        authority: uka.se
                    topic: 
                        Engineering and Technology
                        Industrial Biotechnology
                        Bio Materials
                    @attributes: 
                        lang: swe
                        authority: uka.se
                    topic: 
                        Teknik och teknologier
                        Industriell bioteknik
                        Biomaterial
                    @attributes: 
                        lang: swe
                        authority: ltu
                    topic: Trä och bionanokompositer
                    genre: Research subject
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                        lang: eng
                        authority: ltu
                    topic: Wood and Bionanocomposites
                    genre: Research subject
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                languageTerm: eng
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                publication/journal-article
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                Published
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                Validerad; 2014; 20130608 (krioks)
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                    affiliation: Fibre and Particle Engineering Laboratory Department of Process and Environmental Engineering University of Oulu
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                    title: Journal of Applied Polymer Science
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                                type: volume
                            number: 131
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