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Effect of Thickness for Sound Absorption of High Density Biopolymer Foams

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Abstract:

Waste cooking oils are problematic disposal especially in the developed countries. In this paper, waste cooking oil is used as raw material to produce foam. The purpose of the study is to develop the high density solid biopolymer (HDB) by using hot compression moulding technique based on flexible and rigid crosslinking agents. Physical properties such as Scanning Electron Microscope (SEM) and density of HDB were examined. The acoustic study of HDB for flexible and rigid has been measured using impedance tube test according ASTM E1050 standard with multiple layers of thicknesses. It was revealed that higher thicknesses of HDB exhibit less sound absorption coefficients. This situation is occurred for both flexible and rigid HDB. The frequency also shifted to the left when the layers of HDB were increased for both materials. The highest increment was 63.46%, observed from two layers from flexible and rigid HDB. For the conclusion, rigid HDB showed that they could absorb more sound, thus having higher noise reduction coefficient (NRC) than flexible HDB at low frequency.

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Periodical:

Key Engineering Materials (Volumes 594-595)

Pages:

183-187

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.594-595.183

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Online since:

December 2013

Authors:

Najibah A. Latif, Anika Zafiah M. Rus, M. Khairul Zaimy A. Ghani

Keywords:

Foam, High Density Solid, Sound Absorption Coefficient

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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