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Cellulose nanofibrils as reinforcing agents for PLA-based nanocomposites: An in situ approach
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. Univ Milan, Dept Chem, Via Golgi 19, I-20133 Milan, Italy.;K;Univ Milan, Dept Chem, CRC Mat Polimer LaMPO, Via Golgi 19, I-20133 Milan, Italy..
Univ Milan, Dept Chem, Via Golgi 19, I-20133 Milan, Italy.;Univ Milan, Dept Chem, CRC Mat Polimer LaMPO, Via Golgi 19, I-20133 Milan, Italy..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-7790-8987
INNOVHUB SSI Paper Dept, Via Giuseppe Colombo 83, I-20133 Milan, Italy..
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2019 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 171, p. 94-102Article in journal (Refereed) Published
Abstract [en]

One-pot in situ polymerization approach was explored for the preparation of polylactide (PLA)-cellulose nano-fibril (CNF) bio-nanocomposites. CNF were first prepared through enzymatic and mechanical treatment of bleached hardwood kraft pulp. The bio-nanocomposites- were then fabricated through ring opening polymerization (ROP) of L-lactide, in the presence of various amounts of fibrils. Molecular weight, thermal properties, surface morphology, mechanical and wettability properties of the PLA-CNF nanocomposites were evaluated. DSC analysis demonstrated the effect of CNF on crystallization and crystalline morphology of PLA. Improved modulus for the nanocomposites with respect to standard PLA was demonstrated, however, the differences in tensile stress were small probably due to the counteracting effects of reinforcement from CNF and the decreasing molecular weight as a function of CNF concentration. The absence of pulled-out fibers was assessed, highlighting the strong interface and covalent attachment of PLA chains on CNF surface. Finally, the covalent bonding of PLA chains on CNF surface was demonstrated by isolating the non-soluble part, consisting of PLA-grafted CNF, and characterization of this residue.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2019. Vol. 171, p. 94-102
Keywords [en]
Fibers, Nano composites, Polymers, Short-fibre composites, Interfacial strength
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-244094DOI: 10.1016/j.compscitech.2018.12.015ISI: 000457505600011Scopus ID: 2-s2.0-85058640232OAI: oai:DiVA.org:kth-244094DiVA, id: diva2:1289871
Note

QC 20190219

Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2019-02-19Bibliographically approved

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Hakkarainen, Minna

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