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Surface- and bulk-modified galactoglucomannan hemicellulose films and film laminates for versatile oxygen barriers
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: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 7, no 6, 1983-1989 p.Article in journal (Refereed) Published
Abstract [en]

The objective of this study was to create oxygen barrier films based on the hemicellulose O-acetylgalactoglucomannan (AcGGM) that show high resistance toward moisture-rich conditions. We have applied Williamson benzylation, a classic derivatization method of carbohydrates, as well as two different methods for surface grafting, and, finally, lamination of unmodified hemicellulose films with the synthesized hydrophobic benzylgalactoglucomannan (BnGGM). It was found that the thermoplastically behaving BnGGM could form independent transparent and strong films that were easy to handle. As expected, their resistance toward water was very high, and the oxygen barrier properties showed drastically lower sensitivity toward moisture than films from the corresponding unmodified material. The surface grafting and lamination methods were approached in order to try and combine excellent barrier properties with moisture tolerance. It was found that the grafting methods applied had a positive effect in this direction; however, lamination turned out to be an even more promising option.

Place, publisher, year, edition, pages
2006. Vol. 7, no 6, 1983-1989 p.
Keyword [en]
KONJAC GLUCOMANNAN, WOOD, XYLAN
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-5568DOI: 10.1021/bm060129mISI: 000238180600040Scopus ID: 2-s2.0-33745617914OAI: oai:DiVA.org:kth-5568DiVA: diva2:9973
Note
QC 20100930. Uppdaterad från Submitted till Published (20100930).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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