The colloidal behaviour of kraft lignin
✍ Scribed by T. Lindström; L. Westman
- Publisher
- Springer
- Year
- 1982
- Weight
- 402 KB
- Volume
- 260
- Category
- Article
- ISSN
- 0340-255X
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## Abstract Polyurethane films were prepared by solution casting using a three‐component system consisting of polymeric MDI, a propylene oxide‐based polyether triol and kraft lignin fractions of different molecular weights. The polyether triol was used as soft segment. The composition of the polyur
Kraft and ethanol organosolv lignins from Picea abies and Fagus sylvatica were carboxymethylated with bromoacetic acid. Of the total hydroxyl groups in the lignins, 60-70 % were earboxymethylated. The reaction led to an increase of the number-average molecular weights. The moisture adsorption of the