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Recycling without Fiber Degradation-Strong Paper Structures for 3D Forming Based on Nanostructurally Tailored Wood Holocellulose Fibers
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Dept Fibreand Polymer Technol, Wallenberg Wood Sci Ctr, Tekn Ringen 54, SE-10044 Stockholm, Sweden..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0001-5818-2378
2020 (English)In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, ISSN 2168-0485, Vol. 8, no 2, p. 1146-1154Article in journal (Refereed) Published
Abstract [en]

Cellulosic paper products based on sustainable resources are of interest as a replacement for petroleum-based plastics, for example, in packaging applications. Improvements are desired for mechanical performance, recyclability, and possibilities to shape fiber networks into complex geometries. Commercial bleached wood fibers from the kraft process have insufficient mechanical properties for many applications, even with beating and additives. In addition, mechanical properties of paper structures are significantly reduced after recycling. Here, recycling and 3D shaping performance of holocellulose fibers are compared with kraft fibers and investigated in the context of wood fiber tailoring for eco-friendly materials. Holocellulose fibers from wood are prepared by mild peracetic acid delignification for well-preserved nanostructures and hemicellulose content (28 wt %). Paper structures of about 50% porosity are prepared from both types of fibers by vacuum filtration and drying. Mechanical tensile tests are performed, and fracture surfaces are investigated. The effects of recycling on the fiber structure (chemical composition, morphology, and crystallite size in fibers) and mechanical paper properties are reported. 3D-shaping performance is studied using compression molding with a double-curved mold. Holocellulose paper structures showed much better mechanical properties than kraft fiber paper (Young's modulus 10 GPa, ultimate tensile strength 100 MPa), as well as better recycling performance (only 26% decrease in strength after 5 cycles) and 3D formability. The well-preserved cellulose and hemicellulose components are important, as well as the homogeneity of the fiber cell wall nanostructure. This preserves the intrinsic mechanical properties of fibers, reduces hornification effects, and provides strong interfiber adhesion. Furthermore, the water-soluble hemicelluloses present at the cellulose-cellulose interface are able to facilitate recycling and 3D forming.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2020. Vol. 8, no 2, p. 1146-1154
Keywords [en]
packaging, recycling, shaping, nanostructure, hemicellulose, cellulose, bio-based, wood fibers
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-267750DOI: 10.1021/acssuschemeng.9b06176ISI: 000509432200045Scopus ID: 2-s2.0-85078656746OAI: oai:DiVA.org:kth-267750DiVA, id: diva2:1393902
Note

QC 20200217

Available from: 2020-02-17 Created: 2020-02-17 Last updated: 2020-02-17Bibliographically approved

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