Properties of hemp fibre polymer composites -An optimisation of ...

CONCLUSION
• Hemp stems could be defibrated with P. radiata Cel 26 on at least the 100 g
scale to make fibers, since the pectin and wax rich epidermis was degraded.
• The fibers retained parallel orientation and are thus useful for unidirectional
composites.
• Lignin located in the middle lamellae between the single fibers made defibration
with pectinase enzymes difficult without simultaneous oxidation of lignin as
performed by P. radiata Cel 26.
• Fibers defibrated using P. radiata Cel 26 were stiffer than untreated fibers in
epoxy composites, since the cell wall aggregates were glued together to form a
stiff structure.
REFERENCE LIST
Browning, B. L. (1967). Methods of wood chemistry. New York: Interscience
Publishers, A division of John Wiley & Sons.
Cichocki, F. R., & Thomason, J. L. (2002). Thermoelastic anisotropy of a natural
fiber. Composites Science and Technology, 62, 669-678.
Daniel, G., & Nilsson, T. (1994). Polylaminate concentric cell wall layering in fibres
of Homalium foetidum and its effect on degradation by microfungi. In Donaldson
LA, Davies, G. C., & Bruce, D. M. (1997). A stress analysis model for composite
coaxial cylinders. Journal of Materials Science, 32, 5425-5437.
Fink, H. P., Walenta, E., & Kunze, J. (1999). The structure of natural cellulosic
fibres - Part 2. The supermolecular structure of bast fibres and their changes by
mercerization as revealed by X-ray diffraction and C-13-NMR-spectroscopy.
Papier, 53, 534-542.
Garcia-Jaldon, C., Dupeyre., D., & Vignon, M. R. (1998). Fibres from semi-retted
hemp bundles by steam explosion treatment. Biomass & Bioenergy, 14, 251-260.
Hepworth, D. G., Vincent, J. F. V., Jeronimidis, G., & Bruce, D. M. (2000). The
penetration of epoxy resin into plant fibre cell walls increases the stiffness of
plant fibre composites. Composites Part A-Applied Science and Manufacturing,
31, 599-601.
Hofrichter, M., Lundell, T., & Hatakka, A. (2001). Conversion of milled pine wood
by manganese peroxidase from Phlebia radiata. Applied Environmental
Microbiology, 67, 4588-4593.
Jensen, W. (1962 ). Botanical histochemistry, principles and practice. San
Francisco: WH Freeman and Co.
Khalili, S., Daniel, G., & Nilsson, T. (2000). Use of soft rot fungi for studies on the
microstructure of kapok (Ceiba pentandra (L.) Gaertn.) fibre cell walls.
Holzforschung, 54, 229-233.
Khalili, S., Nilsson, T., & Daniel, G. (2001). The use of soft rot fungi for
determining the microfibrillar orientation in the S2 layer of pine tracheids. Holz
Als Roh-und Werkstoff, 58, 439-447.
Madsen, F. T., Burgert, I., Jungnikl, K., Felby, C., & Thomsen, A. B. (2003). Effect
of enzyme treatment and steam explosion on tensile properties of single hemp
fiber. In 12th International Symposium on Wood and Pulping Chemistry
(ISWPC) (P80). Madison.
Madsen, B., & Lilholt, H. (2003). Physical and mechanical properties of
unidirectional plant fibre composites - an evaluation of the influence of porosity.
Composites Science and Technology, 63, 1265-1272.
Mcdougall, G. J., Morrison, I. M., Stewart, D., Weyers, J. D. B., & Hillman, J. R.
(1993). Plant fibers - botany, chemistry and processing for industrial use. Journal
of the Science of Food and Agriculture, 62, 1-20.
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