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Impact of birch xylan composition and structure on film formation and properties
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Wood Chemistry and Pulp Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. University of Helsinki, Finland.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Wood Chemistry and Pulp Technology. Graduate School of Engineering in Paper, Print Media and Biomaterials, Grenoble INP-Pagora, Grenoble, 38402, France.
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.ORCID iD: 0000-0003-0277-2269
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Wood Chemistry and Pulp Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-2900-4713
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2020 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 74, no 2, p. 184-196Article in journal (Refereed) Published
Abstract [en]

Commercial birch xylan (CX) and alkali-soluble birch xylan (ASX) were subjected to controlled acetylation and used for film formation in the presence (20% and 40%) or absence of plasticizers (i.e. glycerol, sorbitol and xylitol). Although the content of Klason lignin was similar (1.2-1.4%), the acetylation process was favored by the high-purity CX (97% xylan) over the ASX (89% xylan). On the other hand, the presence of residual pectin heteropolysaccharides rather than xylan in the ASX sample was beneficial for film formation. These heteropolysaccharides seemed to act as natural plasticizers during film formation, allowing the formation of coherent films from ASX, even in the absence of an external plasticizer. The use of plasticizers favored the mechanical properties of films, especially in a dosage of 40%, when plastic behavior was created. Acetylation favored the film formation and slightly improved the mechanical properties of the films, and this improvement was in the same range as that achieved when using 20% plasticizer in non-acetylated ASX.

Place, publisher, year, edition, pages
Walter de Gruyter, 2020. Vol. 74, no 2, p. 184-196
Keywords [en]
birch xylan, controlled acetylation, physico-mechanical properties, plasticizer, thermochemical properties
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-268778DOI: 10.1515/hf-2018-0224ISI: 000510621600011Scopus ID: 2-s2.0-85066132162OAI: oai:DiVA.org:kth-268778DiVA, id: diva2:1396201
Conference
15th European Workshop on Lignocellulosics and Pulp (EWLP), JUN 26-29, 2018, Aveiro, Portugal
Note

QC 20200225

Available from: 2020-02-25 Created: 2020-02-25 Last updated: 2020-02-25Bibliographically approved

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de Carvalho, Danila MoraisMarchand, CeliaBerglund, JennieLindström, MikaelVilaplana, FranciscoSevastyanova, Olena

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de Carvalho, Danila MoraisMarchand, CeliaBerglund, JennieLindström, MikaelVilaplana, FranciscoSevastyanova, Olena
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