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Sains Malaysiana 48(5)(2019): 1121–1128
http://dx.doi.org/10.17576/jsm-2019-4805-21
Kesan Penambahan
Kepingan Nanozarah
Grafin terhadap Sifat Mekanik dan
Terma Hibrid
Komposit Serabut Sansevieria-Getah Asli-Polietilena
Berketumpatan Tinggi (Effects of Addition Graphene Nanoplatlet on the Mechanical Properties and Thermal Hybrid
Composite Fibre Sansevieria
Natural Rubber-High Density Polyethylene) NURZAM EZDIANI
ZAKARIA2,3,
ISHAK
AHMAD1,2,
WAN
NAZRI
WAN
BUSU3,
KHAIRUNNIZAH
HAZILA
KHALID3
& AZIZAH BAHARUM1,2* 1Pusat Penyelidikan
Polimer (PORCE), Fakulti
Sains dan Teknologi,
Universiti Kebangsaan
Malaysia, 43600 UKM Bangi, Selangor
Darul Ehsan, Malaysia 2Pusat Pengajian
Sains Kimia dan
Teknologi Makanan, Fakulti Sains dan
Teknologi, Universiti
Kebangsaan Malaysia, 43600 UKM Bangi,
Selangor Darul Ehsan, Malaysia 3Program Perekaan,
Pemprosesan dan
Pembungkusan Makanan, Pusat Penyelidikan Sains Teknologi, Makanan Institut Penyelidikan dan Kemajuan Pertanian Malaysia, Peti Surat 12301 Pejabat Pos Besar, 50774 Kuala
Lumpur, Malaysia Received:
19 September 2018/Accepted: 15 March 2019 ABSTRAK Kajian ini dilakukan untuk
mengkaji kesan
penghibridan kepingan nanozarah grafin (GNP)
ke atas sifat
mekanik, morfologi
dan terma komposit
Sansevieria trifasciata-getah
asli-polietilena ketumpatan
tinggi (STF-NR-HDPE). Pemprosesan penghibridan komposit STF-NR-HDPE dan
GNP
dilakukan dengan
menggunakan mesin
pengadun dalaman. Tahap pengisian sebanyak 20 % bt. STF ke atas matriks
(NR/HDPE)
telah dilakukan
dalam kajian ini
dengan variasi
GNP
yang digunakan adalah
antara 1-10 % bt. Adunan komposit yang terhasil ditekan dengan mesin penekan
panas untuk
mendapatkan sampel ujian berketebalan 1 mm dan 3 mm. Sampel dinilai melalui ujian tegangan, ujian hentaman Izod, pembelauan sinar-X (XRD) dan
kalorimetri pengimbasan
berbeza (DSC). Kajian
morfologi pula dijalankan
dengan menggunakan mikroskop elektron pengimbas pelepasan medan (FESEM). Keputusan
menunjukkan bahawa
nilai kekuatan regangan dan kekuatan
hentaman komposit
menunjukkan sedikit penurunan bacaan pada permulaan penambahan amaun GNP tetapi bacaan kebanyakan
komposisi kemudiannya
menunjukkan peningkatan selepas 5 % bt. tahap pengisian dan ke atas.
Modulus tegangan pula secara
umumnya menunjukkan
peningkatan bacaan dengan penambahan pengisi. Analisis terma dengan menggunakan
alat DSC tidak
menunjukkan perubahan
aliran graf yang ketara terhadap kelakuan terma bahan. Ini kerana
STF
adalah bahan
yang mempunyai kestabilan
terma yang baik. Kata kunci:
Kepingan nanozarah
grafin; komposit hibrid; serabut semula jadi; sifat
mekanik ABSTRACT This research was done to study
the effects of graphene nanoplatlet
(GNP)
hybridization on the mechanical, morphological and thermal properties
of Sansevieria trifasciata-natural
rubber-high density polyethylene (STF-NR-HDPE) composite. Processing
of STF-NR-HDPE with modification of GNP was
done by using an internal mixer. Filler loading of 20 wt. %
STF into
the matrix (NR/HDPE) was introduced in this study with variation of
GNP
composition used was around 1-10 wt. %. Composite
blends obtained were pressed with a hot-press machine to produce
samples with 1 mm and 3 mm of thickness. Samples were evaluated
via tensile test, Izod impact test,
X-Ray Diffraction (XRD) and differential scanning calorimeter
(DSC). Morphological study was done by using a field emission
scanning electron microscope (FESEM). The results showed that
tensile strength and impact strength had decreased at the early
stage of GNP
addition but the values keep increasing after
more than 5 wt. % of GNP were
added to the system. Generally, tensile modulus showed an increasing
trend with the increment of filler loading. Thermal analysis
with DSC did
not show any obvious trend towards materials’ thermal behavior.
This is due to the good thermal stability characteristic of
STF. Keywords: Graphene nanoplatlet; hybrid
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