Absorbent materials based on kraft pulp: Preparation and material characterization
Journal article, 2012

Today, petroleum-based superabsorbents are widely used, but interest in renewable alternatives is on the rise. This study presents two wood-based absorbent materials suitable for various absorption applications as an alternative to petroleum-based products. Never-dried bleached kraft pulp was treated with TEMPO-oxidation, and new carboxylate and aldehyde groups were introduced. It was found that the aldehyde groups contributed to the wet integrity of the absorbent materials, possibly by the formation of hemiacetal bonds. After oxidation, the pulp fibers were gradually disintegrated, and size analysis showed that the disintegration rate was enhanced by an increase in the charge of the oxidant. Freeze drying produced a porous foam with a large surface area that enabled a rapid absorption rate as well as a reasonably high absorption capacity even for absorption under load. Air drying formed a compact film with a slow absorption rate but with a high final capacity for absorption.

native cellulose

Film

tempo-mediated oxidation

Freeze drying

TEMPO-oxidation

Foam

fibers

Absorption

fibrils

Disintegration

MFC

Author

Fredrik Wernersson Brodin

Chalmers, Chemical and Biological Engineering, Forest Products and Chemical Engineering

Hans Theliander

Wallenberg Wood Science Center (WWSC)

Chalmers, Chemical and Biological Engineering, Forest Products and Chemical Engineering

BioResources

1930-2126 (ISSN)

Vol. 7 2 1666-1683

Subject Categories

Chemical Engineering

More information

Latest update

8/27/2018