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Oxygen barrier materials from renewable sources: materials properties of softwood hemicellulose-based films
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
2006 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 100, no 4, 2985-2991 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to investigate the film-forming ability of the hemicellulose O-acetyl-galactoglucomannan (AcGGM) and to evaluate its potential as a barrier material. The polymer film was evaluated by measurement of its oxygen permeability (Ox-Tran® Mocon), thermal properties (differential scanning calorimetry), and dynamic mechanical properties under a humidity scan (humidity-scan DMA). The AcGGM was isolated from industrial process water obtained from mechanical wood pulping. The self-supporting films were formed by solution-casting from water. As expected, a plasticizer was needed to avoid brittleness, and glycerol, sorbitol, and xylitol were compared. However, these additives resulted in higher sensitivity to moisture, which might be less beneficial for some applications. Interesting oxygen barrier and mechanical strength properties were achieved in a film obtained from a physical blend of AcGGM and either alginate or carboxymethylcellulose, both having a substantially higher molecular weight than AcGGM. No phase separation was observed, since all the components used were rich in hydroxyl functionalities. When a plasticizer was also added to the binary mixture, a compromise between (1) low O2 permeability, (2) high mechanical toughness, and (3) flexibility of an AcGGM-based film was obtained.

Place, publisher, year, edition, pages
2006. Vol. 100, no 4, 2985-2991 p.
Keyword [en]
Galactoglucomannan, Hemicellulose, Mechanical properties, Oxygen permeability, Solution casting
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-5567DOI: 10.1002/app.22958ISI: 000236423600053Scopus ID: 2-s2.0-33645776982OAI: oai:DiVA.org:kth-5567DiVA: diva2:9972
Note
QC 20100927. Uppdaterad från In press till Published (20100927).Available from: 2006-04-06 Created: 2006-04-06 Last updated: 2017-11-21Bibliographically approved
In thesis
1. Hemicellulose as barrier material
Open this publication in new window or tab >>Hemicellulose as barrier material
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Polysaccharides constitute an important source of raw materials for the packaging industry today. Polysaccharides have good natural barrier properties which are necessary for packaging films. Cellulose is the forerunner among renewable polymers for such applications. Hemicelluloses represent a new interesting breed of barrier materials. We have chosen to work with the hemicellulose O-acetyl-galactoglucomannan (AcGGM). The high water solubility of this particular hemicellulose extracted from process waters is both an advantage and a limiting factor. However, through the right modification, the water sensitivity of AcGGM can be regulated.

This thesis presents four ways to modify AcGGM: (i) benzylation, (ii) plasma surface treatment followed by styrene addition, (iii) vapor-phase (VP) surface grafting with styrene, and (iv) lamination of an unmodified film with a benzylated material. The most important methods of analysis of the films produced include contact angle measurement, dynamic mechanical analysis under moisture scan, and oxygen gas permeability measurement.

It was found that unmodified AcGGM films have low oxygen permeability at intermediate relative humidity (50 % RH) and good dynamic mechanical properties over a wider humidity range. Films of benzylated material (BnGGM) exhibited a decrease in oxygen permeability at lower humidity but showed better tolerance to higher humidities and indicated better dynamic mechanical behavior than AcGGM films. Lamination proved to be the most promising technique of modification, combining the good gas barrier properties of AcGGM films with the moisture-insensitivity of the BnGGM films.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 61 p.
Series
Trita-FPT-Report, ISSN 1652-2443 ; 2006:7
Keyword
Hemicellulose, galactoglucomannan, plasma surface treatment, vaporphase grafting, benzylation, contact angle, oxygen permeability, solution casting
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-3907 (URN)91-7178-293-1 (ISBN)
Presentation
2006-04-07, Sal E2, KTH, Lindstedtsvägen 3, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101117Available from: 2006-04-06 Created: 2006-04-06 Last updated: 2010-11-17Bibliographically approved

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Hartman, JonasAlbertsson, Ann ChristineSöderqvist Lindblad, MargarethaSjöberg, John
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