Impact of Lignin Content on the Properties of Hemicellulose Hydrogels

Polymers

Ola Wallberg¹  Mats Galbe¹  Basel Al-Rudainy¹  Monica Arcos Hernandez²  Patric Jannasch² 

[1] Department of Chemical Engineering, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden;Department of Chemistry, Polymer, and Materials Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden;

关键词: galactoglucomannan;    lignin;    lignin-carbohydrate complex;    ultrafiltration;    precipitation;    hydrogel;   

DOI  :  10.3390/polym11010035

来源: DOAJ

【 摘 要 】

Hemicellulose is a promising renewable raw material for the production of hydrogels. This polysaccharide exists in large amounts in various waste streams, in which they are usually impure and heavily diluted. Several downstream processing methods can be combined to concentrate and purify the hemicellulose. However, such an approach can be costly; hence, the effect of impurities on the formation and properties of hydrogels must be determined. Lignin usually exists in these waste streams as a major impurity that is also difficult to separate. This compound can darken hydrogels and decrease their swellability and reactivity, as shown in many studies. Other properties and effects of lignin impurities are equally important for the end application of hydrogels and the overall process economy. In this work, we examined the feasibility of producing hydrogels from hemicelluloses that originated from sodium-based spent sulfite liquor. A combination of membrane filtration and anti-solvent precipitation was used to extract and purify various components. The influence of the purity of hemicellulose and the addition of lignosulfonates (emulated impurities in the downstream processing) to the crosslinking reaction mixture on the mechanical, thermal, and chemical properties of hydrogels was determined.

【 授权许可】

Unknown