Sains Malaysiana 40(4)(2011): 379–384
Effect of Aluminum Hydroxide Loading on the Compression
Stress and Modulus, Thermal Conductivity and Acoustic Properties of Palm-Based
Polyurethane Hybrid Composite
(Kesan Penambahan Aluminium Hidroksida
Terhadap Tegasan dan Modulus Mampatan, Kekonduksian Terma dan Sifat Akustik
Komposit Hibrid Poliuretana Berasaskan Sawit)
Nor
Rabbi’atul ‘Adawiyah Norzali & Khairiah Haji Badri*
School
of Chemical Sciences & Food Technology, Faculty of Science & Technology
Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor D.E., Malaysia
Mohd
Zaki Nuawi
Department
of Civil and Mechanical Engineering
Faculty
of Engineering and Built Environment, Universiti Kebangsaan Malaysia
43600
UKM Bangi, Selangor D.E., Malaysia
Diserahkan:
9 Disember 2009 / Diterima: 15 Julai 2010
ABSTRACT
The effect of adding aluminum hydroxide (ATH)
in the palm-based polyurethane hybrid composite was studied. The compression
stress and modulus, thermal conductivity and acoustic property were determined.
The hybrid composite was prepared by adding 10 wt% of oil palm empty fruit
bunch fibre (EFB) followed by ATH at varying amount of 2, 4
and 6 wt% of the overall mass of the resin. The compression stress and modulus
gave the highest values of 575 kPa and 2301 kPa, respectively at 2 wt% ATH.
At 4 wt% ATH, the compression stress and modulus decreased to 431
kPa and 1659 kPa, respectively and further decreased at 6 wt% ATH to
339 kPa and 1468 kPa respectively. The k-value increased with the increment of
the ATH loading exhibited a poor thermal conductivity. Sound
absorption analysis indicated that the absorption coefficient was higher at
higher frequency (4000 Hz) for all samples with PU-EFB/ATH with
4% ATH showed the highest absorption coefficient.
Keywords: Acoustic property; aluminum hydroxide; palm-based
polyurethane; thermal conductivity
ABSTRAK
Kesan penambahan aluminum hidroksida (ATH)
ke dalam komposit hibrid poliuretana (PU) berasaskan sawit telah
dikaji. Tegasan dan modulus mampatan, kekonduksian terma dan sifat akustiknya
ditentukan. Komposit hibrid PU disediakan dengan
menambahkan 10% bt serabut tandan kosong kelapa sawit (EFB)
diikuti dengan penambahan ATH pada peratus penambahan
divariasikan pada 2, 4 dan 6% bt mengikut berat keseluruhan resin. Tegasan dan
modulus mampatan adalah pada nilai tertinggi pada penambahan 2% bt. ATH iaitu
masing-masing 338 kPa dan 2209 kPa. Pada 4% bt. ATH,
tegasan dan modulus mampatan menurun kepada masing-masing 431 kPa dan 1659 kPa
dan semakin menurun dengan penambahan 6% ATH kepada masing-masing 379
kPa dan 1468 kPa. Nilai k meningkat dengan penambahan ATH dan
mempamerkan sifat kekonduksian terma yang lemah. Analisis serapan bunyi
menunjukkan koefisien serapan yang tinggi pada frekuensi tinggi (4000 Hz) untuk
semua sampel dengan PU-EFB/ATH (4%
bt ATH) menunjukkan pekali serapan tertinggi.
Kata kunci:
Aluminum hidroksida; kekonduksian terma; poliuretana berasaskan sawit; sifat
akustik
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*Pengarang untuk
surat-menyurat; email: kaybadri@ukm.my
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