Sains Malaysiana 40(7)(2011): 749–756
Effect of Rice
Husk Surface Modification by LENR the on Mechanical
Properties of NR/HDPE Reinforced Rice Husk Composite
(Kesan
Rawatan Permukaan Sekam Padi dengan LENR ke Atas
Sifat Mekanik
Komposit NR/HDPE diperkuat
Sekam Padi)
Rahmadini Syafri, Ishak Ahmad
& Ibrahim Abdullah*
Pusat Pengajian Sains Kimia dan Teknologi Makanan,
Universiti Kebangsaan Malaysia
43600 UKM Bangi, Selangor D.E., Malaysia
Diserahkan: 23 Oktober 2009 / Diterima: 20 Ogos 2010
ABSTRACT
Surface
modification of rice husk (RH) with alkali pre-treatment (NaOH
solution 5% w/v) was carried out at the initial state to investigate the effect
of surface treatment of fibre on the surface interaction between fibre and
rubber. Further modification of RH surfaces after alkali
treatment was using Liquid Epoxidized Natural Rubber (LENR)
coating at three concentrations, 5%, 10%, and 20% wt LENR solution
in toluene. Interfacial morphology and chemical reactions between RH fibre
and rubber were analyzed by FTIR and Scanning Electron
Microscope (SEM). It was found that 10% wt LENR solution
gave the optimum interaction between fibre and rubber. Matrix and composite
blends derived from 60% natural rubber (NR), 40% high density
polyethylene (HDPE) reinforced with RH fibre
were prepared using an internal mixer (Brabender Plasticoder). Result showed
that pre-treatment of RH treated with 5% NaOH followed by
treatment with 10% LENR solution given the maximum
interaction between fibre and matrix that gave rise to better mechanical
properties of the composites.
Keywords:
High density polyethylene; liquid epoxidized natural rubber; mechanical
properties; rice husks; sodium hydroxide
ABSTRAK
Modifikasi
permukaan sekam padi (SP) dengan pra-rawatan alkali (larutan
NaOH 5% w/v) telah dijalankan untuk mengkaji keberkesanan rawatan permukaan SP ke
atas interaksi permukaan antara serabut dan getah. Modifikasi permukaan SP seterusnya
adalah dengan penyalutan getah asli terepoksida cecair (LENR)
pada tiga kepekatan yang berbeza iaitu 5%, 10% dan 20% w/w LENR dalam
larutan toluena. Morfologi antaramuka dan reaksi kimia antara SP dan
getah (LENR) dikaji melalui analisis FTIR dan
mikroskop elektron imbasan (SEM). Didapati bahawa larutan LENR 10% memberikan interaksi yang optimum antara serabut dan getah (LENR).
Adunan matriks dan komposit disediakan daripada 60% getah asli (NR),
40% polietilena berketumpatan tinggi (HDPE) diperkuat dengan pengisi SP di
jalankan dengan menggunakan pengadun dalaman (Brabender Plasticoder). Keputusan
kajian menunjukkan bahawa pra-rawatan SP dengan larutan NaOH 5%
diikuti dengan rawatan LENR 10% memberikan interaksi maksimum
antara pengisi dan matriks seterusnya meningkatkan sifat mekanik kommposit
Kata kunci: Getah asli
terepoksida cecair; natrium hidroksida (NaOH); polietilena berketumpatan
tinggi; sekam padi; sifat mekanik
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*Pengarang untuk surat-menyurat; email: dia@ukm.my
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