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Hydrogels from polysaccharides for biomedical applications
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.
2007 (English)In: Materials, Chemicals, and Energy from Forest Biomass / [ed] Dimitris S. Argyropoulos, 2007, 153-167 p.Chapter in book (Other academic)
Abstract [en]

Development of products made from renewable sources is considered to be a strategic research area by the international scientific community since it is generally accepted that the fossil fuels will be exhausted in the foreseeable future. Another related strategic area is the development of new bioactive and biocompatible polymers capable of exerting a temporary therapeutic function. Among other substances, polysaccharides have been proposed to be suitable materials as matrixes for the preparation of hydrogels, e.g., for use in key applications such as drug release systems and tissue engineering. Methods reported for preparation of hydrogels using renewable polysaccharides aimed for biomedical use will be reviewed.

Place, publisher, year, edition, pages
2007. 153-167 p.
Series
ACS Symposium Series, ISSN 0097-6156 ; 954
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-5569DOI: 10.1021/bk-2007-0954.ch010Scopus ID: 2-s2.0-36749034869ISBN: 978-084123981-4 OAI: oai:DiVA.org:kth-5569DiVA: diva2:9974
Note
QC 20101117Available from: 2006-04-06 Created: 2006-04-06 Last updated: 2010-11-17Bibliographically 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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CiteExportLink to record
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