Ultrasonic Treatment in Surface Modification of Sisal Fiber

Ultrasonic wave propagation in solvent mixture is an important technique in fiber engineering technology. Surface bleaching and surface modification of natural fiber can be well maintained when the basic interaction can be studied in natural fiber-reinforced composites with solvent mixture. In the present investigation sisal fiber has been chosen as natural fiber and its surface is treated with solvent mixture of malleic acid with ethanol. The ultrasonic velocities are determined in binary mixture of malleic acid and ethanol with different frequencies (1 MHz, 3 MHz and 5 MHz) at temperature 303 K. The different acoustical properties like intermolecular free length, isentropic compressibility, acoustic impedance and bulk modulus are computed from the ultrasonic velocity and density of the mixture. The variation of these parameters relating to chemical composition of fiber and solvent mixture are discussed in terms of intermolecular interactions.