Synthesis And Characterization Of Light Weight Natural Foam From CSM Coconut Fiber Filled Polyurethane For Acoustic Applications

Nur Aqilah, Ya'kob (2013) Synthesis And Characterization Of Light Weight Natural Foam From CSM Coconut Fiber Filled Polyurethane For Acoustic Applications. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Sandwich structure is a very expensive engineering material. However, due to its multiple advantages such as light weight and high strength, its demand is relatively high. In this project, the natural material fiber was intended to replace the synthetic fiber in the core to reduce its dependency on synthetic materials. Basically, the use of natural material can minimize the cost in terms of materials and processing as well as to conserve the environment by reducing the waste of natural material. This research utilized the green natural fiber in the manufacturing of acoustic panel which must own good properties such as the sound absorption. Furthermore, the materials and the processes involve are simple and cost effective. The materials needed are coconut fiber, polystyrene, polyurethane, and polyester. The sandwich structure is done by using hand lay-up and press technique using a hydraulic press machine with 1 tonne pressure. The natural acoustic panel is drilled in order to produce perforation on the surface of the panel. The parameter used in this research is the perforation of the natural fiber. The suggested diameter for the perforation is 3 mm and 6 mm. The acoustical properties of the sandwich structure are tested by using impedance tube testing. There are 23 samples design prepared for the impedance tube testing. The impedance tube testing is to measure the absorption coefficient of the natural fiber. Among the 23 samples that had been tested, the most suitable sample to be applied as an acoustic panel at low, medium and high frequency are S3, S 13 and S 14, respectively. In particular, 0.90, 0.98 and 0.85 of the absorption coefficient value at 600, 1500 and 2400Hz, respectively.

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