ABSTRACT In this study Eucalyptus tannin (T) was isolated from outer bark of Eucalyptus trees; as sodium phenoxide salt and used as extender or copolymer into phenol formaldehyde (PF) resin at five percent (10, 20, 30, 40 and 50)% W/W. Tan-nin-phenol formaldehyde (TPF) and tannin formaldehyde-phenol formaldehyde (TFPF) resins that synthesized in this study were evaluated as adhesive material for cellulosic fibers by study the mechanical properties of the composite sheets .The results show that the substituting of (PF) with tannin at (10 –50)% W/W give resins with mechanical properties comparable or near to those of pure (PF) , where the tensile strength at break (Tb) ranging from 15.15 Mpa to 22.27 Mpa as compared with 17.6 Mpa for pure (PF); while the impact strength properties (Im) of composites sheets increased with increased the (T) percents which were about 5.16 KJ/m2 for (TPF – 10%) and 7.21 KJ/m2 for (TPF - 50%) .On the other hand modification of (T) to tannin formaldehyde resin (TF) appear less performance at the results of this study , this effect probably to low penetration of (TFPF) resins between the small voids of cellulose fibers when soaked it in resin solutions. In general the results of this study indicate that the Eucalyptus tannin can be used for par-tial substitution of (PF) to produce resins with feasible mechanical properties and can be used in some applications of (PF) resins.
Cite this paper
nullA. Hussein, K. Ibrahim and K. Abdulla, "Tannin–Phenol Formaldehyde Resins As Binders for Cellulosic Fibers: Mechanical Properties," Natural Resources, Vol. 2 No. 2, 2011, pp. 98-101. doi: 10.4236/nr.2011.22013.
 M. Belgacem and A. Gandini, “Monomers, Polymers and Composites from Renewable Resources,” Elsevier Ltd. Cambridge, 2008, PP. 179-200.
 J. M. Chesworth, T. Stuchbury and J. R. Scaif, “An Introduction to Agricul-tural Biochemistry,” Chapman and Hall, London, 1998, pp. 55-58.
 J. M. Garro Galvez, B. Riedl and A. H. Conner, “Analytical Studies on Tara Tannins,” Holzfor-schung, Vol. 51, No. 3, 1997, pp. 235-243.doi:10.1515/hfsg.19220.127.116.11
 R. W. Hemingway and A. H. Conner (eds), “Adhesives from Renewable Resource,” ACS symposium series 285, Am. Chem. Soc., Washington, 1989, pp. 155-171.
 H. M. Saayman and J. A. Qatly, “Wood Adhesives from Wattle Bark Extract,” Proceeding of the conference on wood gluing. International Union of Forestry Research Or-ganization, Madison, 22-23 September 1975, pp. 28-45.
 S. Kim and H. -J. Kim, “Evaluation of For-maldehyde Emission of Pine and Wattle Tannin-Based Adhesives by Gas Chromatography,” Holz Roh Werkst, Vol. 62, No. 2, 2004, pp. 101-106. doi:10.1515/hfsg.1918.104.22.168
 M. T. Paridah and O. C. Musgrave, “Alkline Treatment of Sulfited Tan-nin-Based Adhesive from Mangrove to Increase Bond Integrity of Beech Slips,” Journal of Tropical Forest Science, Vol. 18, 2006, pp. 137-143.
 G. A. Adam, “Chemistry and Technology of Methylolic Resins: Their Derivatives and IPNs,” National journal of Chemistry, Vol. 1, 2001, pp. 131-157.
 A. K. Raheem, “Synthe-sis, Characterization and Study of Some New Epoxy Resins and Resinous Amines as Hardners,” Ph.D. Thesis, University of Basrah, Basrah, 1992.
 A-Annual book of ASTM Standard, “Tensile Properties of Plastics,” Vol. 8.1, 1986, D638-84. B-Annual book of ASTM Standard, “Standard Test Methods for Impact Resistance of Plastics and Electrical Insulating Materials,” Vol. 8.1, 1986, D256-84.
 M. Olivares, H. Aceituno, G. Neiman, E. Rivera and T. Sellers, “Ligin-Modified Phenolic Adhe-sives for Bonding Radiata Pine Plywood,” Forest product Journal, vol. 45, No. 1, 1995, pp. 63-67.
 T. Sellers, “Survey Reveals Use of Lignin as Partial Substitute for Phenol,” Panel World, Vol. 31, 1990, pp. 26-29.
 R. W. Hemingway, A. H. Conner and S. J. Branham, “Ad-hesives from Renewable Resources,” ACS Symposium, Washington, 1989, pp. 13-42.
 A. Pizzi, “Advanceed Wood Adhesives Technology,” Marcel Dekker, New York, 1994, pp. 149-217.
 M. D. Fabricio and A. R. L. Francisco, “Alternative Castor Oil-Based Polyurthane Adhesives Used in Production of Plywood,” Materials Research, Vol. 7, No. 3, 2004, p. 413. doi:10.1590/S1516-14392004000300007
 D. J. Gardner, S. K. Waage and T. J. Elder, “Bonding Flake-board with Filled and Extended Phenol-Formaldehyde Resin,” Forest Products Journal, Vol. 40, 1990, pp. 31-36.