Comparison between the Chemical-physical Characteristics of Kenaf Bast and Stem Nanofibers

Document Type : Research Paper

Authors

1 Assistant Professor, Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, Kataj, I.R. Iran

2 Associate Professor, Deapetement of Pulp and Paper Industries, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, I.R. Iran

3 Associate Professor, Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, Kataj, I.R. Iran

4 Professor, Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, Kataj, I.R. Iran and Professor, Institute of Tropical Forestry & Forest Products (INTROP), University Putra (UPM), Malaysia

Abstract

In the present study, chemical-physical properties of nanofibers isolated from whole kenaf stem and
kenaf bast fibers were characterized by Transmission Electron Microscope (TEM), Fourier Transform
Infrared (FTIR), Thermogravimetric Analysis (TGA), and X-ray Diffraction (XRD) analysis. The
isolation was done using chemo-mechanical processing where the chemical methods were based on
NaOH-AQ (anthraquinone) and three-stage bleaching (DEpD) processes. The mechanical techniques
involved refining, cryo-crushing and high-pressure homogenization. Microscopy study showed that
the diameter range of isolated nanofibers from kenaf stem was finer than kenaf bast nanofibers, while
their length was similar and in the micrometer range. Fourier transform infrared spectroscopy (FTIR)
study demonstrated that the functional groups for both nanofibers were almost the same and no
significant differences were observed. The results from thermo-gravimetric analysis showed a better
thermal stability for kenaf bast nanofibers compared to the kenaf stem nanofibers. X-ray analysis
revealed that the crystallinity of the studied nanofibers was increased after the chemo-mechanical
isolation process. In addition, the crystallinity was 81% and 63% for kenaf bast and kenaf stem
nanofibers, respectively.

Keywords

References

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