Analysis of sound absorption properties of spent tea leaves-polypropylene composites

Wong, Yung Cheng (2016) Analysis of sound absorption properties of spent tea leaves-polypropylene composites. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This research focuses on the sound absorption properties of spent tea leaves composites materials for sound absorption. Spent tea leaves (STL) are waste materials from tea processing plants, and are considered as new natural resources for sound absorbing polypropylene composite materials. The aims of this research are to synthesize, characterize and study the sound absorption properties of spent tea leaves filled polypropylene composites. Three grades of STL are used in this research, which are BHE-SW (fine fiber), BHE-BM (medium fiber) and SPE-SW (coarse fiber) from the stalk of the tea plant. Portions of STL are subjected to alkalization treatment. The fabricated composites are subjected to FTIR spectroscopy, impedance tube test and microscopic examination. From this research, the sound absorption results have shown that fiber size and treatment conditions have pronounced effects on the sound absorption properties. In term of fiber size, fine fiber composites are good sound absorbers at medium frequency range (1000 – 2500 Hz), while medium and coarse fibers composites are good at absorbing high frequency sound (2500 – 4500 Hz). In term of treatment conditions, untreated fiber composites are good sound absorbers at medium frequency range, while treated fiber composites are good at absorbing high frequency sound. Thus, spent tea leaves filled polypropylene composites can be employed according to the demands of the application.

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