The effect of acetylation on interfacial shear strength between plant fibres and various matrices

Interfacial shear strength between acetylated fibres and various matrices was studied. The chemical modification of oil palm empty fruit bunch (EFB) and coconut fibre (coir) using non-catalysed acetic anhydride were investigated. Proof of acetylation of EFB and coir was indicated by the increase in weight percent gain, and was confirmed by Fourier transform infrared spectra. Pull-out tests were employed to study the compatibility of acetylated fibres with different commercial matrices such as “Epiglass” (epoxy), “West system” (epoxy), “Crystic” (unsaturated polyester), “Metset” (unsaturated polyester) and polystyrene. An increase in the interfacial shear strength between acetylated fibres and hydrophobic resins was noted. Modified fibres were shown to have a smoother surface compared with unmodified, which was believed to be a factor in improving the fibre–matrix adhesion.