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Lignin-Retaining Transparent Wood
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi. KTH, Skolan för kemivetenskap (CHE), Centra, Wallenberg Wood Science Center.ORCID-id: 0000-0002-1591-5815
KTH, Skolan för kemivetenskap (CHE), Centra, Wallenberg Wood Science Center. KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Ytbehandlingsteknik.ORCID-id: 0000-0003-1161-9311
KTH, Tidigare Institutioner (före 2005), Fiber- och polymerteknologi.ORCID-id: 0000-0002-3368-9786
Visa övriga samt affilieringar
2017 (Engelska)Ingår i: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 10, nr 17, s. 3445-3451Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Optically transparent wood, combining optical and mechanical performance, is an emerging new material for light-transmitting structures in buildings with the aim of reducing energy consumption. One of the main obstacles for transparent wood fabrication is delignification, where around 30wt% of wood tissue is removed to reduce light absorption and refractive index mismatch. This step is time consuming and not environmentally benign. Moreover, lignin removal weakens the wood structure, limiting the fabrication of large structures. A green and industrially feasible method has now been developed to prepare transparent wood. Up to 80wt% of lignin is preserved, leading to a stronger wood template compared to the delignified alternative. After polymer infiltration, a high-lignin-content transparent wood with transmittance of 83%, haze of 75%, thermal conductivity of 0.23WmK(-1), and work-tofracture of 1.2MJm(-3) (a magnitude higher than glass) was obtained. This transparent wood preparation method is efficient and applicable to various wood species. The transparent wood obtained shows potential for application in energy-saving buildings.

Ort, förlag, år, upplaga, sidor
WILEY-V C H VERLAG GMBH , 2017. Vol. 10, nr 17, s. 3445-3451
Nyckelord [en]
building materials, delignification, energy saving, lignin, wood
Nationell ämneskategori
Kompositmaterial och -teknik
Identifikatorer
URN: urn:nbn:se:kth:diva-214873DOI: 10.1002/cssc.201701089ISI: 000410136800018Scopus ID: 2-s2.0-85029175474OAI: oai:DiVA.org:kth-214873DiVA: diva2:1152287
Anmärkning

QC 20171024

Tillgänglig från: 2017-10-24 Skapad: 2017-10-24 Senast uppdaterad: 2018-02-21Bibliografiskt granskad
Ingår i avhandling
1. Wood Nanotechnologies for Transparency, Fire Retardancy and Liquid Separation
Öppna denna publikation i ny flik eller fönster >>Wood Nanotechnologies for Transparency, Fire Retardancy and Liquid Separation
2018 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In this thesis, wood nanotechnologies for transparent, fire-retardant and hydrophobic/lipophilic wood have been developed. There are two main parts; wood template preparation/processing concepts and materials design using these templates.

In the wood template processing part, highly porous nanostructured wood templates are prepared. Relationships between processes and material structures are studied. Three chemical treatment methods are used. Lignin and/or chromophores are removed from cell wall, so that nanoscale pores are formed in the cell wall. For preparation of transparent wood, a lignin-retaining method improves physical properties of the template. The pore structures are characterized by scanning electron microscopy and gas adsorption measurement of specific surface area. The compositions of the templates are characterized. Compared with native wood, these templates have nanoscale porosity which provides opportunity for new types of wood modification.

In the materials design part, wood nanotechnologies are used for transparent wood as well as for hydrophobic/lipophilic and fire-retardant wood. Two main strategies are used: i) nanoparticles are embedded inside the cell wall; ii) polymers are impregnated in lumen space, and sometimes also inside the cell wall. The transparent wood is prepared by MMA monomer/oligomer impregnation of lumen space. MMA has similar refractive index to the delignified template, so that scattering is reduced and transparent wood with favorable optical and mechanical properties is obtained. The structure and functional properties are studied. Laminated transparent plywood is designed to modify mechanical properties. Transparent wood and transparent plywood are demonstrated in applications combining loading-bearing properties with optical performance such as luminescent properties.

The highly porous wood template cell walls are also impregnated with colloidal montmorillonite clay or epoxy/amine solutions to modify the cell wall and form nanostructured biocomposites. The structure and properties of the two materials are investigated; wood/clay hybrids for flame-retardancy and wood/epoxy biocomposites for oil/water separation.

Ort, förlag, år, upplaga, sidor
Stockholm: Royal Institute of Technology, 2018. s. 77
Serie
TRITA-CBH-FOU ; 2018:1
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
Teknisk materialvetenskap; Fiber- och polymervetenskap
Identifikatorer
urn:nbn:se:kth:diva-223441 (URN)978-91-7729-671-3 (ISBN)
Disputation
2018-03-07, F3, Lindstedtsvägen 26, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20180221

Tillgänglig från: 2018-02-21 Skapad: 2018-02-21 Senast uppdaterad: 2018-02-21Bibliografiskt granskad

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Li, YuanyuanRojas, RamiroYan, MinLawoko, MartinBerglund, Lars

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Li, YuanyuanRojas, RamiroYan, MinLawoko, MartinBerglund, Lars
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Fiber- och polymerteknologiWallenberg Wood Science CenterYtbehandlingsteknikFiber- och polymerteknologiFarkost och flygBiokompositerVinnExcellens Centrum BiMaC InnovationFiberteknologi
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