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Sains Malaysiana 46(9)(2017): 1361–1367 http://dx.doi.org/10.17576/jsm-2017-4609-02
Effect of Microwave Pretreatment
on the Properties of Particleboard Made from Para Rubber Wood Sawdust
with the Addition of Polyhydroxyalkanoates (Kesan Prarawatan Ketuhar
Gelombang Mikro ke atas Sifat Papan Partikel yang Diperbuat daripada Habuk Gergaji
Kayu Getah Para dengan Polihidroksialkanoat) JUTARUT IEWKITTAYAKORN1*,
PIYAPORN
KHUNTHONGKAEW1,
WILAIWAN
CHOTIGEAT1,2
& KUMAR SUDESH3 1Department
of Molecular Biotechnology and Bioinformatics, Faculty of Science,
Prince of Songkla University,Hat Yai, Songkhla, 90112, Thailand 2Center
for Genomics and Bioinformatics Research, Department of Molecular
Biotechnology and Bioinformatics,
Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla,
90112 Thailand 3Ecobiomaterial
Research Laboratory, School of Biological Sciences, Universiti Sains
Malaysia 11800 Penang, Pulau
Pinang, Malaysia Diserahkan: 31
Ogos 2016/Diterima: 17 Januari 2017 ABSTRACT The aim of this study
was to investigate the effect of microwave pretreatment on the properties
of particleboard made from para rubber wood sawdust with the addition
of polyhydroxyalkanoates (PHAs). Para wood sawdust was pretreated
with microwaves at different wattages (400, 600 and 800 W) and pretreatment
times (5, 10 and 15 min) before being mixed with 10 wt. % of pure
PHAs
and 10 wt. % freeze-dried cells which contained 46.90% wt. % PHA,
in order to make particleboard. The physical and mechanical properties
of the particleboard panels obtained were also tested based on the
Japanese Industrial Standards A 5098 for particleboard (JIS A5908) including modulus of
rupture (MOR), internal bonding (IB),
water absorption (WA) and thickness swelling (TS).
The results showed that only panel made from 10 wt. % freeze-dried
cells and treated with 400 watts for 5 min passed the minimum requirements
of MOR
(7.86 ± 0.67 MPa) and IB (1.62 ± 0.06 MPa) but not passed that
of WA (40.09 ± 6.53%) and TS (34.69
± 5.43%). The panels without the addition of PHA cannot
test WA and TS values because the panels dispersed
immediately when submerged in water. The MOR of
panels decreased with increasing wattages and pretreatment time.
The wattage and pretreatment time of microwave had little effect
on the WA and
TS.
Based on this study, microwave treatment is an appropriate method
for the pretreatment of materials and PHAs can be promoted as potential
additives for making particleboard. Keywords: Microwave;
para rubber wood sawdust; particleboard; PHA; polyhydroxyalkanoates ABSTRAK Tujuan penyelidikan
ini adalah untuk mengkaji kesan prarawatan ketuhar gelombang mikro
pada sifat papan partikel yang diperbuat daripada habuk gergaji
kayu getah para dengan penambahan polihidroksialkanoat (PHA). Habuk gergaji kayu getah
para telah diprarawat dengan ketuhar gelombang mikro pada watt yang
berbeza (400, 600 dan 800 W) dan masa prarawatan (5, 10 dan 15 min)
sebelum dicampur dengan 10 % bt. PHA tulen dan 10 % bt. sel kering sejuk beku yang mengandungi
46.90% % bt. PHA untuk membuat papan partikel. Sifat
fizikal dan mekanik panel papan partikel yang diperoleh juga diuji
berdasarkan Piawaian Industri Jepun - A 5098 bagi papan partikel
(JIS
A5908) termasuk modulus rekahan (MOR), ikatan dalaman (IB),
penyerapan air (WA) dan ketebalan pembengkakan (TS).
Keputusan kajian menunjukkan bahawa hanya panel yang diperbuat daripada
10 % bt. sel kering sejuk beku dan dirawat dengan 400 watt untuk
5 min melepasi keperluan minimum MOR (7.86 ± 0.67 MPa) dan IB
(1.62 ± 0.06 MPa) tetapi tidak melepasi WA (40.09 ± 6.53%) dan TS
(34.69 ± 5.43%). Panel tanpa penambahan PHA tidak boleh menguji nilai
WA
dan TS
kerana panel terserak serta-merta apabila ditenggelami
air. Panel MOR
menyusut dengan peningkatan watt dan masa prarawatan.
Kuasa dan masa prarawatan ketuhar gelombang mikro mempunyai sedikit
kesan ke atas WA
dan TS.
Berdasarkan kajian ini, rawatan ketuhar gelombang mikro adalah satu
kaedah yang sesuai untuk prarawatan bahan dan PHA boleh dipromosikan sebagai
aditif yang berpotensi untuk membuat papan partikel. Kata kunci: Habuk gergaji
kayu getah para; ketuhar gelombang mikro; papan partikel; PHA;
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84-92. *Pengarang untuk surat-menyurat; email: jutarut.p@psu.ac.th
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