Kenaf fibres demonstrate enormous potential in fibre reinforced composites with the excellent performance and environmental benefits. In this work, kenaf fibres were treated with NaOH at the concentrations of 1%, 2%, and 3%.Effects of the alkaline treatments on the mechanical properties of fibre and interfacial shear properties (IFSS) of the resulted composites were systematically evaluated. In addition, relationship between tensile strength and surface friction coefficient of kenaf fibre was shown. Relationship between tensile strength of fibre and IFSS of composites were explored. They were conducted by correlation analysis method. The results indicated that after NaOH treatment, kenaf fibres has increased in tensile strength, surface roughness, friction coefficient, but decreased in diameter. Tensile properties, flexural properties and water absorption of unidirectional kenaf fibre reinforced epoxy resin composites have improved. IFSS of composite treated at 2% alkali has increased by 10.34%, compared to composites untreated fibres. Correlation analysis indicated that there was no significant correlation between kenaf fibre tensile strength and IFSS of the composite. On the other hand, there was significant correlation between kenaf fibre surface friction and the IFSS of the composite with the correlation coefficient of 0.905. ABSTRAK Serabut kenaf menunjukkan potensi besar dalam pembuatan komposit diperkuat serabut disebabkan ia mempunyai prestasi cemerlang dan kesan positif kepada alam sekitar. Dalam kajian ini, serabut kenaf dirawat dengan natrium hidroksida (NaOH) pada kepekatan 1%, 2% dan 3%. Kesan rawatan alkali terhadap sifat mekanik serabut dan sifat geseran permukaan (IFSS) daripada komposit yang dihasilkan dinilai secara sistematik. Di samping itu, hubungan antara kekuatan tegangan dan koefisien geseran permukaan serabut kenaf telah dinyatakan. Hubungan antara kekuatan tegangan serabut dan IFSS komposit telah diterokai. Analisis dijalankan melalui kaedah analisis korelasi. Keputusan menunjukkan selepas rawatan NaOH 1%, serabut kenaf meningkat dalam kekuatan tegangan, kekasaran permukaan, koefisien geseran dan penurunan diameter. Sifat tegangan, sifat lentur dan penyerapan air komposit resin epoksi diperkuat serabut menunjukkan peningkatan. IFSS komposit dengan serabut yang dirawat dengan 2% alkali meningkat sebanyak 10.34%, berbanding komposit dengan serabut yang tidak dirawat. Analisis korelasi menunjukkan tiada korelasi yang ketara antara kekuatan tarik serabut kenaf dan IFSS komposit. Sebaliknya, terdapat hubungan yang signifikan antara geseran permukaan serabut kenaf dan IFSS komposit dengan koefisien korelasi sebanyak 0.905.
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