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Design of new bioresourcepackaging from wood hydrolysates
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Hemicelluloses are a large group of polysaccharides that have recently attracted considerable attention in many industrial fields due to their abundance and renewability. They are non-edible and possess very good oxygen-barrier properties.

Wood hydrolysates are hemicellulose-rich liquids extracted in aqueous solution from the hydrothermal treatment of wood. Nevertheless few industrial applications have been explored for this group of polysaccharides. This thesis presents methods for utilizing wood hydrolysates with primary upgrading as a key material for making oxygen-barrier films with a considerable potential for the food packaging industry.

Softwood hydrolysates from wood chips and the fiberboard industry have been hydrothermally treated and upgraded via ultra-filtration and dia-filtration using different cut-offs.  

Films produced directly from wood hydrolysates were fragile, hence three types of components were chosen to blend with the wood hydrolysates in order to reinforce the matrix: carboxymethyl cellulose (CMC) and microfibrillated cellulose (MFC) have been blended with softwood hydrolysates originally from wood chips (SW), and poly L-lactide (PLLA) with softwood hydrolysates from a fiberboard mill (Masonite AB) referred to as MSW.

MSW was functionalized with L-lactide oligomers through a ring-opening polymerization mediated grafting-from reaction. The graft copolymer was designed to act as a compatibilizer in MSW/PLLA blend films. The PLLA addition improved the tensile behavior of the MSW/PLLA matrix and this effect was further enhanced by the addition of minor amounts of the synthesized compatibilizer which has only a minor influence on the oxygen-barrier property. With addition of only 1% (w/w), a 400% increase in the ductility of the PLLA/MSW was observed.

Free-standing films of SW with different cut-offs were made with CMC and MFC as co-component and oxygen permeability values as low as 0.35 cm3µm day-1m-2kPa-1 was achieved using 10 kDa cut-off softwood hydrolysate, referred to as SW10, which made these films ready to compete with most of the petroleum-based polymers such as PET and PVOH for the packaging industry.

 

Keywords: Wood hydrolysate, oxygen permeability, ring-opening polymerization (ROP), CMC, MFC, food packaging. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. , 29 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2012:20
National Category
Polymer Technologies Paper, Pulp and Fiber Technology Composite Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-95450ISBN: 978-91-7501-345-9 (print)OAI: oai:DiVA.org:kth-95450DiVA: diva2:528402
Presentation
2012-06-07, K1, Teknikringen 56, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20120626Available from: 2012-06-26 Created: 2012-05-25 Last updated: 2012-06-26Bibliographically approved
List of papers
1. Compatibilizers of a purposely designed graft copolymer for hydrolysate/PLLA blends
Open this publication in new window or tab >>Compatibilizers of a purposely designed graft copolymer for hydrolysate/PLLA blends
2011 (English)In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 52, no 21, 4648-4655 p.Article in journal (Refereed) Published
Abstract [en]

A wood hydrolysate derived hemicellulose-rich fraction was functionalized with L-lactide oligomers through a ring opening polymerization mediated grafting-from reaction. The graft copolymer was designed to act as a compatibilizer in hydrolysate/poly(L-lactide) (PLLA) blend films. The PLLA addition improved the tensile behavior of the hydrolysate matrix and this effect was enhanced further by the addition of minor amounts of the synthesized compatibilizer. With only 1% (w/w) of compatibilitzer the compatibility between the components and the homogeneity of the resulting films were greatly improved with an increase of strain-at-break with up to 400%. The oxygen permeability of the blend films was markedly reduced with the addition of wood hydrolysate, compared to the barrier properties of pure PLLA, an effect that is not significantly compromised when compatibilizer amounts are kept small.

Keyword
Compatibilizer, Hydrolysate, Poly(L-lactide)
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-45597 (URN)10.1016/j.polymer.2011.08.053 (DOI)000295424900003 ()2-s2.0-80053054162 (Scopus ID)
Note
QC 20111104Available from: 2011-11-04 Created: 2011-10-31 Last updated: 2017-12-08Bibliographically approved
2. Turning Spruce Wood into Renewable Oxygen Barriers
Open this publication in new window or tab >>Turning Spruce Wood into Renewable Oxygen Barriers
Show others...
(English)Article in journal (Other academic) Submitted
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-98419 (URN)
Note
QS 2012Available from: 2012-06-26 Created: 2012-06-26 Last updated: 2012-06-26Bibliographically approved

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