Development of novel methods for production of cellulose-based materials

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School of Chemical Engineering | Doctoral thesis (article-based) | Defence date: 2019-04-18
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Date

2019

Department

Biotuotteiden ja biotekniikan laitos
Department of Bioproducts and Biosystems

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Mcode

Degree programme

Language

en

Pages

72 + app. 46

Series

Aalto University publication series DOCTORAL DISSERTATIONS, 70/2019

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 renewable, 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 properties of the macromolecule for various purposes. Esterification of cellulose 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.

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Supervising professor

Vuorinen, Tapani, Prof., Aalto University, Department of Bioproducts and Biosystems, Finland

Thesis advisor

Vuorinen, Tapani, Prof., Aalto University, Department of Bioproducts and Biosystems, Finland

Keywords

cellulose nanocrystals, microfibrillated cellulose, pulp, reactivity, TEMPO-mediated oxidation, esterification, film

Other note

Parts

  • [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 View at publisher
  • [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 View at publisher
  • [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.
  • [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.

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https://urn.fi/URN:ISBN:978-952-60-8511-1

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[diss] Kemian tekniikan korkeakoulu / CHEM