Regioselective cationization of cellulosic materials using an efficient solvent-minimizing spray-technique
Artikel i vetenskaplig tidskrift, 2012

Cationization of different cellulosic materials was successfully accomplished using an efficient solvent-minimizing spray-technique. The obtained materials were studied and evaluated in regard to reaction efficiency and regioselectivity using 1D and H-1-C-13 correlated 2D NMR experiments. The high consistencies and temperatures applied using the spray-technique resulted in reagent effective etherifications and shorter reaction times. The NMR spectra indicated that the spray-technique favors substitutions at position O-6, showing a regioselectivity of O-6 > O-2 > O-3 for softwood kraft pulp (SKP) and cotton linters. However, cationization of mercerized cellulose and dissolving pulp, using the spray-technique, demonstrated more efficient reactions compared to SKP and cotton, and a regioselectivity of O-6 a parts per thousand yen O-2 > O-3. Nanocrystalline cellulose showed the lowest reactivity and a regioselectivity of O-6 a parts per thousand < O-3. In this work we provide information on structure-property relationships and characterization methods for modified polysaccharides, together with a solvent system that is well known industrially and in line with sustainability aspects.

biomaterials

chloride

NMR

Regioselectivity

strength

etherification

derivatives

Dissolving pulp

fiber

Softwood kraft pulp

starch

chitosan

Nanocrystalline cellulose

behavior

Cationization

Författare

Hanna de la Motte

Chalmers, Kemi- och bioteknik, Organisk kemi

Gunnar Westman

Chalmers, Kemi- och bioteknik, Organisk kemi

Cellulose

0969-0239 (ISSN)

Vol. 19 5 1677-1688

Ämneskategorier

Pappers-, massa- och fiberteknik

Kemi

DOI

10.1007/s10570-012-9755-8