Development of novel methods for production of cellulose-based materials

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Vuorinen, Tapani, Prof., Aalto University, Department of Bioproducts and Biosystems, Finland
dc.contributor.author Khanjani, Pegah
dc.date.accessioned 2019-04-09T09:01:01Z
dc.date.available 2019-04-09T09:01:01Z
dc.date.issued 2019
dc.identifier.isbn 978-952-60-8511-1 (electronic)
dc.identifier.isbn 978-952-60-8510-4 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/37433
dc.description.abstract Modern technology requires sustainable solutions for future new applications. Different types of cellulose such as cellulose nanocrystals (CNCs) and microfibrillated cellulose (MFC) are of particular interest as renewa-ble, highly functionalizable and widely available raw materials. In this thesis, various novel methods for the production of cellulose-based materials were explored. The main findings of this study can be divided into two parts: (i) introducing a method for assessing the reactivity of cellulose in chemical pulps and bacterial cellulose (BC) under mild conditions (RT and pH 9) (Paper I) and ii) investgating several approaches for the chemical functionalization of cellulose as an easy way to adjust the prop-erties of the macromolecule for various purposes. Esterification of cellu-lose with long-chain aliphatic acid chloride is an effective technique for enhancing the hydrophobicity of cellulose, which can then be used as a coating (Paper II). Another crucial route of cellular functionalization is TEMPO-mediated oxidation, which forms carboxyl groups on the surface of MFC. Crosslinking of these carboxyl groups with metal ions under specific conditions leads to increased tensile strength of the cellulosic film (Paper III and IV). The results yield different approaches to the cellulose reactivity and to improve the water-resistance and tensile strength of the paper and Films, respectively, which may create many renewable options in various applications to replace fossil raw materials. en
dc.format.extent 72 + app. 46
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 70/2019
dc.relation.haspart [Publication 1]: Khanjani, P.; Väisäinen, S.; Lovikka, V.; Nieminen, K.; Maloney, T.; Vuorinen, T. Assessing the reactivity of cellulose by oxidation with 4-acetamido-2,2,6,6-tetramethylpiperidine-1-oxo-piperidinium cation under mild conditions, Carbohydrate Polymers, 2017, 176, 293-298. DOI:10.1016/j.carbpol.2017.08.092
dc.relation.haspart [Publication 2]: Khanjani, P.; King, A.W.T.; Partl, G.J.; Johansson, L.S.; Kostiainen, M.A.; Ras, R.H.A. Superhydrophobic paper from nanostructured fluorinated cellulose esters, ACS Applied Materials & Interfaces, 2018, 10 (13), 11280-11288. Full Text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201805222563. DOI: 10.1021/acsami.7b19310
dc.relation.haspart [Publication 3]: Khanjani, P.; Kosonen, H.; Ristolainen, M.; Virtanen, P.; Vuorinen, T. Interaction of divalent cations with carboxylate group in TEMPO-oxidized microfibrillated cellulose systems, 2018.
dc.relation.haspart [Publication 4]: Khanjani, P.; Ristolainen, M.; Kosonen, H.; Virtanen, P.; Ceccherini, S.; Maloney, T.; Vuorinen, T. Time-triggered calcium in bridging in preparation of films of oxidized microfibrillated cellulose and pulp, 2018.
dc.subject.other Chemistry en
dc.title Development of novel methods for production of cellulose-based materials en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.contributor.school School of Chemical Technology en
dc.contributor.department Biotuotteiden ja biotekniikan laitos fi
dc.contributor.department Department of Bioproducts and Biosystems en
dc.subject.keyword cellulose nanocrystals en
dc.subject.keyword microfibrillated cellulose en
dc.subject.keyword pulp en
dc.subject.keyword reactivity en
dc.subject.keyword TEMPO-mediated oxidation en
dc.subject.keyword esterification en
dc.subject.keyword film en
dc.identifier.urn URN:ISBN:978-952-60-8511-1
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Vuorinen, Tapani, Prof., Aalto University, Department of Bioproducts and Biosystems, Finland
dc.opn Fardim, Pedro, Prof., University of Leuven, Belgium
dc.contributor.lab Wood Chemistry en
dc.rev Ek, Monica, Prof., KTH Royal Institute of Technology, Sweden
dc.rev Sirviö, Juho, Dr., University of Oulu, Finland
dc.date.defence 2019-04-18
local.aalto.acrisexportstatus checked 2019-06-17_1333


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