effect of the outermost fibre layers on solubility of dissolving grade pulp

Dissolving pulps are used to manufacture various cellulose derived products through cellulose dissolution. Solubility of cellulose pulp has been claimed to be strongly dependent on the porosity development, the degree of polymerisation and the pulp viscosity. The removal of external cell walls has b...

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Bibliographic Details
Published in:Cellulose (London) 2015-12, Vol.22 (6), p.3955-3965
Main Authors: Grönqvist, S, Treimanis, A, Kamppuri, T, Maloney, T, Skute, M, Grinfelds, U, Vehviläinen, M, Suurnäkki, A
Format: Article
Language:English
Subjects:
Bioorganic Chemistry
cell walls
Cellulose
Cellulose pulp
Ceramics
Chemistry
Chemistry and Materials Science
Composites
Degree of polymerization
Dissolution
dissolving pulp
enzymatic treatment
enzymes
fibres
Glass
Long fibers
manufacturing
Natural Materials
Organic Chemistry
Original Paper
Peeling
Physical Chemistry
Polymer Sciences
polymerization
Porosity
Pretreatment
Sodium hydroxide
Solubility
solvents
Surface layers
Sustainable Development
viscosity
Zinc oxide
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Summary:Dissolving pulps are used to manufacture various cellulose derived products through cellulose dissolution. Solubility of cellulose pulp has been claimed to be strongly dependent on the porosity development, the degree of polymerisation and the pulp viscosity. The removal of external cell walls has been proposed to have a key role in the pulp solubility. In this paper, the effect of the outermost surface layers on the solubility of a dissolving grade pulp was studied. Furthermore the effect of mechanical peeling and combined mechanical and enzymatic treatment on pulp solubility was compared. Based on the results combined mechanical and enzymatic treatment efficiently opens up the fibre structure and has a clear positive effect on the solubility of dissolving pulp. It seems that long fibre fraction is less accessible to solvent chemicals than the other pulp fractions. Mechanical peeling of outer fibre layers does not improve fibre dissolution to NaOH/ZnO. Thus, it seems that peeling alone is not a sufficient pre-treatment prior to dissolution. The results also revealed that the peeling treatment does not enhance the effects of enzymes as the studied mechanical treatment does.
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-015-0709-9