Fiber Surface Modification of Kraft Pulp in Presence of Chitosan Polymer

Document Type : Research Paper

Authors

1 MSc., Department of Wood and Paper, Sari University of Agricultural Sciences and Natural Resources, Sari, I.R. Iran

2 Assistant Professor, Department of Wood and Paper, Sari University of Agricultural Sciences and Natural Resources, Sari, I.R. Iran

3 Assistant Professor, Department of Cellulose & Paper Technology, Campus 1, Shahid Beheshti University, Zirab, Savadkooh, I.R. Iran

Abstract

The effect of fiber surface modification on physical and mechanical properties of Kraft pulp was
studied with and without Chitosan. First, the amount of carboxyl groups of Kraft pulp at different
addition levels (0, 2, 3, 4 and 6%) of hydrogen peroxide was determined by means of methylene blue
test. Then, the samples containing the highest carboxyl groups were treated at pH=8.5 with Chitosan at
0.75% addition level (based on oven dry pulp). Results showed that individual surface modification of
fibers increased the strength properties of paper. It was also indicated that alone application of
Chitosan can act as a dry strength agent due to its ability to produce Hydrogen, Ionic and Covalent
bonding. Also, surface modification of fibers by H2O2 lead to increase of Carboxyl groups followed by
increasing anionic charge with together with Chitosan formed a dual system. The effect of Chitosan on
apparent density, tensile index and burst index of Kraft paper were significant and on the tear index of
paper was not significant. In the current study, the best results obtained at level of 3% hydrogen
peroxide.

Keywords

References

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Forest and Wood Products
Volume 67, Issue 3 - Serial Number 3
October 2014
Pages 489-501

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