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Wet feeding approach for cellulosic materials/PCL Biocomposites
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Biocomposites.ORCID iD: 0000-0001-8840-1172
2018 (English)In: Biomass Extrusion and Reaction Technologies: Principles to Practices and Future Potential, American Chemical Society (ACS), 2018, p. 209-226Chapter in book (Refereed)
Abstract [en]

In the past decades, cellulosic materials attracted increasing interest for their potential as reinforcement in bioplastics due to their intrinsic strength and light weight, although uniform fiber dispersion is a challenge. Among biodegradable polyesters, polycaprolactone (PCL) has regained attention for its biodegradability in marine environment together with its ductility. Its low strength, petroleum-based origin and comparably high cost, limit the use of PCL. PCL, therefore, is a good candidate for beneficial effect of cellulose material addition for the preparation of biodegradable composites with improved properties. A one-step wet compounding is reported in this chapter to validate a sustainable method to improve the cellulose dispersion in a hydrophobic polymer matrix as PCL. A comparison between cellulosic wood pulp fibers, microfibrillated cellulose and nanofibrils is made to assess the feasibility of the wet feeding approach for the processing of the biocomposites. Assessment of matrix molar mass demonstrated that PCL is insensitive to the presence of the water during the melt compounding. FE-SEM and X-ray tomography was used to characterize the morphology and to evaluate the nanofibrillation. Tensile tests were carried out to evaluate the mechanical properties of the biocomposites. The shortening and dispersion of the cellulose fibers after the melt processing were evaluated. Young's modulus values indicated that the wet feeding approach improve the dispersion of the cellulose and resulted in enhanced mechanical properties of the biocomposites. The beneficial effect of the wet feeding approach was greater for the pulp fibers compared to the microfibrillated cellulose or the nanofibrils due to a more efficient melt processing and more significant effect on the preservation of the fiber length and their aspect ratio.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. p. 209-226
Series
ACS Symposium Series, ISSN 0097-6156 ; 1304
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-238403DOI: 10.1021/bk-2018-1304.ch011Scopus ID: 2-s2.0-85052301145ISBN: 9780841233713 (print)OAI: oai:DiVA.org:kth-238403DiVA, id: diva2:1262474
Note

QC 20181112

Available from: 2018-11-12 Created: 2018-11-12 Last updated: 2018-11-12Bibliographically approved

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