Malaysian Journal of Analytical Sciences Vol 22 No 6 (2018): 1031 - 1039

DOI: 10.17576/mjas-2018-2206-13

 

 

 

AN ACOUSTIC STUDY OF Shorea leprosula WOOD FIBER FILLED POLYURETHANE COMPOSITE FOAM

 

(Kajian Akustik Busa Komposit Poliuretana Terisi Serat Kayu Shorea leprosula)

 

Muhammad Shafiq Mohd Azahari, Anika Zafiah M. Rus*, Shaharuddin Kormin, M. Taufiq Zaliran

 

Sustainable Polymer Engineering, Advanced Manufacturing and Material Center (SPEN-AMMC),

Faculty of Mechanical and Manufacturing Engineering,

Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia

 

*Corresponding author:  zafiah@uthm.edu.my

 

 

Received: 27 July 2017; Accepted: 28 April 2018

 

 

Abstract

Polyurethane foam is an excellent material for sound absorbing materials. This material is produced by mixing crosslinker, and polyol to produce foams with the presence of blowing agent. This study consists of an experimental study on acoustics properties enhancement of polyurethane foam by mixing different weight percentage of Shorea leprosula wood fiber into the polymer matrix. An optimal percent of 5-20% wood fiber was used to obtain a homogeneous mixture. The polymer foam composites acoustic properties were measured by using impedance tube test to obtain the sound absorption coefficient. The polymer foam composites UF₈₀ produced have a better sound absorption coefficient, α of 0.9507. UF₈₀ gives a higher density of 865.5 kg/m³ and smallest pore size of 413.4 µm which is determined by using Mettler Toledo Density kit and Scanning Electron Microscope (SEM) respectively compared to UF. The noise reduction coefficient (NRC) of the polymer foam composites UF₈₀ is twice as high as UF. This studies proved that Shorea Leprosula wood fiber influenced the acoustic properties of polymer foam composites.

 

Keywords:  polyurethane foam, wood fiber, acoustic properties, sound absorption coefficient, noise reduction coefficient

 

Abstrak

Busa poliuretana adalah bahan yang sangat baik untuk bahan menyerap bunyi. Bahan ini dihasilkan dengan mencampurkan penghubung silang, dan poliol untuk menghasilkan busa dengan kehadiran ejen meniup. Kajian ini terdiri daripada kajian mengenai sifat-sifat akustik penambahbaikan busa poliuretana dengan mencampurkan peratusan berat serat kayu Shorea leprosula berbeza ke dalam matriks polimer. Peratus optimum serat kayu 5-20% digunakan untuk mendapatkan campuran homogen. Sifat akustik polimer komposit diukur dengan menggunakan ujian tiub impedans untuk mendapatkan pekali penyerapan bunyi. Polimer komposit UF₈₀ yang dihasilkan mempunyai pekali penyerapan bunyi, α yang lebih baik dengan 0.9507. UF₈₀ memberikan ketumpatan yang lebih tinggi dengan 865.5 kg/m³ dan saiz liang yang lebih kecil dengan 413.4 µm masing-masing ditentukan menggunakan kit ketumpatan Mettler Toledo dan Mikroskopi Pengimbas Elektron (SEM) berbanding UF. Pekali pengurangan hingar (NRC) daripada polimer komposit UF₈₀ adalah dua kali lebih tinggi daripada UF. Kajian ini membuktikan bahawa serat kayu Meranti Merah mempengaruhi sifat akustik busa poliuretana.

 

Kata kunci:  busa poliuretana, serat kayu, sifat akustik, pekali penyerapan bunyi, pekali pengurangan hingar

 

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