Abstract
The need for biobased polymers is increasing. The raw materials from
agricultural and forest resources are renewable and abundant in nature. Among
forest-based biomass, hemicelluloses form a scarcely utilized but extensive
material source. Over one million tons of hemicelluloses could be extracted
annually in Finland from pulp or wood chips without reducing the fiber
quality for papermaking. Significant amounts of polysaccharides can also be
found in mechanical pulping process waters. In order to tailor hemicelluloses
to valuable compounds, chemical modification is often needed. The aim with
the chemical derivatization was to adjust the degree of molecular branching
and hydrophobicity. The purpose of adjusting the branching was to create
internal plasticization and to provide thermoplasticity. Hemicellulose
derivatives were tested as e.g. aqueous coatings. In general the grease
resistance was excellent and water resistance mediocre. Oxygen and water
vapor barrier depended on the modification. Water-soluble xylan derivatives
and crosslinked galactoglucomannan provided film formation and the best
barrier in the case of pigment-coated paperboard. The best coatings provided
similar barrier properties than polyester used as a reference. Also
hydrophobic xylan derivatives provided relatively good water vapor barrier on
uncoated board. Hydrophobically modified xylans had both thermoplastic
properties and extremely good water resistance
Original language | English |
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Title of host publication | TAPPI 2012 PLACE Conference Proceedings |
Subtitle of host publication | Helping Me Do My Job Better |
Publisher | TAPPI Press |
Pages | 364-386 |
ISBN (Print) | 978-1-59510-218-8 |
Publication status | Published - 2012 |
MoE publication type | A4 Article in a conference publication |
Event | TAPPI 2012 PLACE Conference - Seattle, United States Duration: 6 May 2012 → 9 May 2012 |
Conference
Conference | TAPPI 2012 PLACE Conference |
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Abbreviated title | PLACE 2012 |
Country/Territory | United States |
City | Seattle |
Period | 6/05/12 → 9/05/12 |