In this study, flax fibres were treated initially with a 2.5, 5, and 7% of sodium hydroxide (NaOH) solution at room temperature for one hour. Among different treatments, fibres treated with 2.5% alkali solution showed optimal properties. Hence, for further studies, all flax fibres were treated with 2.5% solution of alkali solution, but at different temperatures. In the next phase of study, biocomposites were prepared by immersing fibre mats in resin bath and compression moulding using a hot press. Two polymers: polyester and a polyester-biopolymer blend, Envirez® 1807 were used as matrices. Moisture absorption and flexure tests were conducted on the composites. It was determined that composites with treated fibres showed reduction in moisture uptake compared to those with untreated fibres. Composites with alkali treated fibres showed an increase in flexural properties as well as storage modulus which was attributed to effects of chemical treatment. Composites made using Envirez® 1807 which has about 22% of natural polymer showed comparable properties with those made using polyester resin system.
KlingbeilM.Working document of Biodegradable Waste Management: European Commission, Brussels, 2003.
2.
LinsteadC., ElkinsP.Mapping UK Resources and Material Flows: Royal Society for Natural Conservation, Mass Balance, U.K., 2001: 12.
3.
JohnM.J., ThomasS., “Bio-fibers and bio-composites,”Carbohydrate Polymers, 71, (2003), 343–364.
4.
KhanM.A., HassanM.M., DrzalL.T., “Effect of 2-hydroxyethyl methacrylate (HEMA) on the mechanical and thermal properties of jute-polycarbonate composite”, Composites Part A: Applied Science and Manufacturing, 36, 1 (2005), 71–81.
5.
ChielliniE., CinelliP., ChinelliniF., and ImanS.H.“Environmentally Degradable Bio-Based Polymeric Blends and Composites,”Macromol: Biosciences, 4 (2004) 218–231.
6.
KimJ.J., NetravaliA.N., “Mercerization of Sisal fibers: Effect of tension on mechanical properties of Sisal fiber and fiber reinforced composites,”Composites Part A: Applied Science & Manufacturing, 41, (2010), 1245–1252.
7.
KimHe, and KimH., “Enhanced hydrolysis resistance of Biodegradable polymers and Bio-composites,”Polymer Degradation and Stability, 98, (2008), 1544–1553.
8.
MohantyA.K., MisraM., DrzalL.T., “Natural Fibers, Biopolymers and Bio composites,”Taylor & Francis Group, (2005): 21–24.
9.
MishraS., MisraM., TripathyS.S., NayakS.K., MohantyA.K., “The influence of chemical surface modification on performance of Sisal-polyester Bio composites,”Polymer Composites, 23, (2002), 164–170.
10.
GraupnerN., HerrmannA.S., MussigJ., “Natural and man-made cellulose fiber reinforced poly lactic acid (PLA) composites: An overview about mechanical characteristics and application areas,”Composites Part A, 40, (2009), 810–821.
11.
MiyagawaH., MohantyA.K., BurguenoR., DrzalL.T., MisraM., “Novel Bio based resins from Blends of Functionalized soybean oil and Unsaturated polyester Resin,”Journal of Polymer Science, Part B, Polymer Physics, 45 (2007), 698–704.
12.
LuJ., KhotS., WoolR., “New sheet molding compound resins from soybean oil: synthesis and characterization,”Polymer, 46, (2005), 71–80.
HeJ., TangY., WangS., “Difference in morphological characteristics of Bamboo fibers and other natural cellulose fibers,” Studies on X-ray diffraction, solid state 13C-CP/MAS NMR, and second derivative FTIR spectroscopy data, Iranian Polymer Journal, 16(12), (2007), 807–818.
16.
CarrilloF., ColomX., SunolJ.J., SaurinaJ.“Structural FTIR analysis and thermal characterization of lyocell and viscose–type fibers,”European Polymer Journal, 40 (2004) 2229–2234.
JahnA., SchroderM.W., FustingM., SchenzelK., DiepenbrockW., “Characterization of alkali treated flax fibers by means of FT Raman spectroscopy and environmental scanning electron microscopy,”Spectrochimica Part A, 58, (2002), 2271–2279.
19.
SampathkumarD., PunyamurthR., VenkateshappaS.C., BennehalliB., “Effect of Chemical Treatment on Water Absorption of Areca Fiber,”Journal of Applied Sciences Research, 8(11), (2012), 5298–5305.
20.
SupriA.G., LimB.Y., “Effect of Treated and Untreated Filler Loading on the Mechanical, Morphological, and Water Absorption Properties of Water Hyacinth Fibers-Low Density Polyethylene Composites,”Journal of Physical Science, 20(2) (2009), 85–96.
21.
AbdullahN.M., AhmadI., “Effect of Chemical Treatment on Mechanical and Water-Sorption Properties Coconut Fiber-Unsaturated Polyester from Recycled PET,”ISRN Materials Science, Volume 2012 (2012), Article ID 134683, 8 pages, http://dx.doi.org/10.5402/2012/134683
22.
DhakalH.N., ZhangZ.Y., RichardsonM.O.W., “Effect of water absorption on the mechanical properties of hemp fibre reinforced unsaturated polyester composites,”Composites Science and Technology, 67 (7–8), (2007), 1674–1683.
23.
VenkateshwaranN., Elaya PerumalA., AlavudeenA., ThiruchitrambalamM., “Mechanical and water absorption behaviour of banana/sisal reinforced hybrid composites,”Materials and Design, 32(7), (2011), 4017–4021.
24.
LiX., TabilL.G., PanigrahiS., “Chemical Treatments of Natural Fiber for Use in Natural Fiber-Reinforced Composites: A Review,”Journal of Polymer Environment, 15, (2007), 25–33.
25.
AlvarezV.A., RuscekaiteR.A., VazquezA., “Mechanical Properties and Water Absorption Behavior of Composites Made from a Biodegradable Matrix and Alkaline-Treated Sisal Fibers,”J. Compos. Mater., 37(17), (2003), 1575–1588.
26.
FrederickT.W., NormanW., Natural fibers plastics and composites.Kluwer Academic Publishers, New York, (2004).
27.
RowellR.M., YoungR.A., RowellJ.K., Paper and composites from agro-based resources.CRC Lewis Publishers, Boca Raton FL, (1997).
28.
Valadez-GonzalezA., Cervantes-UcJ. M., OlayoR., Herrera-FrancoP. J., “Chemical modification of henequén fibers with an organosilane coupling agent,”Compos. B: Eng., 30, (1999), 321–331.
