Sains Malaysiana 40(7)(2011): 685–689
Effect of Electron Beam Irradiation on
Natural Rubber/Linear Low Density
Polyethylene Blends with m-Phenylenebismaleimide
(Kesan
Sinaran Alur Elektron bersama m-Fenilenabismaleimida ke Atas
Adunan
Getah Asli/Polietilena Linear Berketumpatan Rendah)
Nor
Hayati Muhammad*
Universiti
Teknologi MARA, 88997 Kota Kinabalu, Sabah, Malaysia
Ibrahim
Abdullah
School
of Chemical Sciences and Food Technology, Faculty of Science and Technology
Universiti
Kebangsaan Malaysia, 43600 Bangi, Selangor D.E. Malaysia
Dahlan Hj. Mohd
Malaysian Nuclear Agency Bangi, 43000
Kajang, Selangor D.E. Malaysia
Diserahkan: 23 Oktober 2009 / Diterima:
5 Oktober 2011
ABSTRACT
The
effects of HVA-2 on radiation-induced cross-linkings in 60/40
natural rubber/ linear low density polyethylene (NR/LLDPE)
blends was studied. NR/LLDPE was
irradiated by using a 3.0 MeV electron beam machine with doses ranging from 0
to 250 kGy. Results showed that under the irradiation employed, the blends NR/LLDPE were cross-linked by the electron beam irradiation. The presence
of HVA-2 in the blends caused the optimum dose to decrease
and the blends to exhibit higher tensile properties. Further, within the dose
range studied, the degradation caused by electron beam irradiation was found to
be minimal. The optimized processing conditions were 120oC,
50 rpm rotor speed and 13 min processing time. The gel content, tensile
strength, elongation at break, hardness and impact test studies were used to
follow the irradiation-induced cross-linkings in the blend. For blends of 60/40 NR/LLDPE with 2.0 phr HVA-2, the optimum tensile strength
and dose, were 19 MPa and 100 kGy, respectively. Blends of 60/40 NR/LLDPE without HVA-2, the optimum tensile strength
and dose were 17.2 MPa and 200 kGy, respectively.
Keywords:
Cross-linking; HVA-2; irradiation; NR/LLDPE
ABSTRAK
Kesan
m-fenilenabismaleimida (HVA-2) yang boleh menggalak dan merangsang
taut silangan akibat sinaran ke atas adunan getah asli/ polietilena linear
berketumpatan rendah (NR/LLDPE)
60/40 telah dikaji. Adunan NR/LLDPE 60/40
disinari pada dos antara 0 dan 250 kGy menggunakan mesin alur elektron 3 MeV.
Keputusan menunjukkan bahawa sinaran alur elektron boleh menyebabkan taut
silangan dalam adunan NR/LLDPE.
Kehadiran HVA-2 dalam adunan NR/LLDPE boleh
mengurangkan dos optimum yang diperlukan dan meningkatkan sifat-sifat regangan.
Keadaan pemprosesan optimum yang diperoleh adalah suhu 120oC,
kadar rotor 50 rpm dan masa pengadunan 13 min. Bagi adunan NR/LLDPE 60/40 yang mengandungi 2.0 phr HVA-2,
kekuatan tegasan maksimum dan dos sinaran adalah masing-masing 19 MPa dan 100
kGy. Bagi adunan NR/LLDPE 60/40
tanpa HVA-2, kekuatan tegasan maksimum dan dos sinaran adalah
masing-masing 17.2 MPa dan 200 kGy.
Kata kunci: HVA-2; NR/LLDPE;
sinaran; taut silangan
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*Pengarang
untuk surat-menyurat; email: hayati688@sabah.uitm.edu.my
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