In this study, polyester-kenaf fiber composites were prepared by adding various percentages of kenaf fiber in unsaturated polyester resin and subsequently cross-linked using methyl ethyl ketone peroxide and the accelerator cobalt octanoate. Liquid natural rubber (LNR) (3%) was added as a toughening agent. Kenaf fibers were treated with sodium hydroxide solution to improve the interfacial bonding between the fiber and the matrix. The mechanical properties of the composites were evaluated by impact and flexural testing. Environmental stress cracking resistance (ESCR) of composites in acid and base medium was also studied. Bonding mechanisms were assessed by scanning electron microscope and Fourier transform infrared analysis. It was found that the addition of LNR increased the impact strength and fracture toughness. Alkali fiber treatment was found to provide better impact and flexural strengths to the composites. Measurement of ESCR shows that the composite with acid medium has the fastest diffusion rate, followed by that with base medium, and then without medium.
Espert, A., Vilaplana, F. and Karlsson, S. ( 2004). Comparison of Water Absorption in Natural Cellulosic Fibres From Wood and One-Year Crops in Polypropylene Composites and its Influence on their Mechanical Properties, Composites Part A: Applied Science and Manufacturing, 35(11): 1267-1276.
2.
Annuar, H., Ahmad, S.H., Rasid, R., Ahmad, A. and Wan Busu, W.N. ( 2007). Mechanical Properties and Dynamic Mechanical Analysis of Thermoplastic-Natural-Rubber-Reinforced Short Carbon Fibre and Kenaf Fibre Hybrid Composites, Journal of Applied Polymer Science, 107: 4043-4052.
3.
Xue, Y., Du, Y., Elder, S., Wang, K. and Zhang, J. ( 2009). Temperature and Loading Rate Effects on Tensile Properties of Kenaf Bast Fiber Bundles and Composites, Composites: Part B, 40: 189-196.
4.
Aziz, S.H. and Ansell, M.P. ( 2004). The Effect of Alkalizations and Fibre Alignment on the Mechanical and Thermal Properties of Kenaf and Hemp Bast Fibre Composites: Part 2- Cashew Nut Shell Liquid Matrix, Composites Science and Technology, 64: 1231-1238.
5.
Dash, B.N., Rana, A.K., Mishra, H.K., Nayak, S.K., Mishra, S.C. and Tripathy, S.S. ( 2006). Novel, Low-Cost Jute-Polyester Composites. Part 1: Processing , Mechanical Properties, and SEM Analysis, Polymer Composites , 20(1): 62-71.
6.
Acha, B.A., Marcovich, N.E. and Reboredo, M.M. ( 2005). Physical and Mechanical Characterization of Jute Fabric Composites, Journal of Applied Polymer Science, 98(2): 639-650.
7.
Ismail, Z., Ahmad, I.B., Zakaria, F.A., Ramli, A., Ahmad Marzuki, H.F. and Abdul Aziz, A. ( 2006). Modification of Epoxy Resin Using Liquid Natural Rubber , Material Science Forum, 517: 272-274.
8.
Dahlan, H.M. , Khairul Zaman, M.D. and Ibrahim, A. (2002). Liquid Natural Rubber (LNR) as a Compatibiliser in NR/LLDPE Blends - 11: The Effect of Electron-Beam (EB) Irradiation, Radiation Physics and Chemistry, 64: 429-436.
9.
Ibrahim, A. and Dahlan, H.M. ( 1998). Thermoplastics Natural Rubber Blends, Progress in Polymer Science, 23: 665-706.
10.
Rowell, R.M. ( 2004). Solid Wood Processing/Chemical Modification, In: Encyclopedia of Forest Science, pp. 1269-1274, Elsevier Academic Press, Oxford.
11.
Tajvidi, M. and Ebrahimi, G. (2003). Water Uptake and Mechanical Characteristics of Natural Filler-Polypropylene Composites , Journal of Applied Polymer Science, 88: 941-946.
12.
Bledzki, A.K. , Mamun, A.A., Lucka, M. and Gutowsk, V.S. (2008). The Effects of Acetylation on Properties of Flax Fibre and its Polypropylene Composites, Express Polymer Letters, 2(6): 413-422.
13.
Beg, M.D.H. and Pickering, K.L. (2008). Accelerated Weathering of Unbleached and Bleached Kraft Wood Fibre Reinforced Polypropylene Composites , Polymer Degradation and Stability, 93: 1939-1946.
14.
Beg, M.D.H. and Pickering, K.L. (2006). Fibre Pre-treatment and its Effects on Wood Fibre Reinforced Polypropylene Composites, Materials and Manufacturing Processes, 21: 303-307.
15.
Pickering, K.L. , Abdalla, A., Ji , C., McDonald , . A.G. and Franich, R.A. (2003). The Effect of Silane Coupling Agents on Radiata Pine Fibre for Use in Thermoplastic Matrix Composites , Composites Part A: Applied Science and Manufacturing, 34(10): 915-926.
16.
Bibo, G.A. and Hogg, P.J. ( 1996). The Role of Reinforcement Architecture on Impact Damage Mechanisms and Post-impact Compression Behaviour, Journal of Materials Science, 31: 1115-1137.
17.
Bledzki, A.K. and Gassan, J. (1999). Composites Reinforced with Cellulose Based Fibres, Polymer Science, 24: 221-274.
18.
Bhardwaj, N.K. , Hoang, V. and Nguyen, K.L. (2007). A Comparative Study of the Effect of Refining on Physical and Electrokinetic Properties of Various Cellulosic Fibres, Bioresource Technology , 98: 1647-1654.
19.
Kleinschek, K.S. and Ribitsch , V. (1998). Electrokinetic Properties of Processed Cellulose Fibers, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 140: 127-138.
20.
Grushnikov, O.P. and Shorygina , N.N. (1970). The Present State of the Problem of Lignin-Carbohydrate Bonds in Plant Tissues , Russian Chemical Reviews, 39: 684-694.
21.
Ray, D. , Sarkar, B.K., Rana, A.K. and Bose, N.R. (2001). The Mechanical Properties of Vinylester Resin Matrix Composites Reinforced with Alkali-Treated Jute Fibres, Composites Part A: Applied Science and Manufacturing , 32(1): 119-127.
22.
Ismail, H., Shuhelmy, H. and Edyham, M.R. ( 2002). The Effects of a Silane Coupling Agent on Curing Characteristics and Mechanical Properties of Bamboo Fibre Filled Natural Rubber Composites , European Polymer Journal, 38: 39-47.
23.
David, W. ( 1996). Environmental Stress Cracking of Plastic, Rapra Technology Ltd, UK.
24.
Rahmat, A.R. and Day, R.J. (2003). Curing Characteristics of Unsaturated Polyester/Aramid Reinforced Composite: Microwave vs. Thermal Energy, Jurnal Teknologi, 39(A): 83-96.
25.
Baley, C., Busnel, F., Grohens, Y. and Olivier, S. ( 2006). Influence of Chemical Treatments on Surface Properties and Adhesion of Flax Fibre-Polyester Resin, Composites: Part A Applied Science and Manufacturing, 37: 1626-1637.
26.
Laly, A.P., Sabu, T. and Groeninckx, G. ( 2006). The Role of Fibre/Matrix Interactions on the Dynamic Mechanical Properties of Chemically Modified Banana Fibre/Polyester Composites , Composites Part A: Applied Science and Manufacturing, 37: 1260-1269.
