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Penyediaan dan Pencirian Nanokomposit Epoksi Berpenguat
Getah Asli Terepoksida
(Preparation
and Characterisation of Epoxidized Natural Rubber Reinforced Epoxy
Nanocomposites)
Se Yong Eh Noum*, Sahrim Ahmad, Rozaidi Rasid, Yew Chin Hock,
Lee Yip Seng & Mou'ad A. Tarawneh
School of Applied Physic, Faculty of Science and Technology, Universiti Kebangsaan Malaysia
43600 Bangi, Selangor,
Malaysia
Diserahkan:
19 Disember 2011/Diterima: 4 Oktober 2013
ABSTRAK
Komposit epoksi berpengisi hibrid
OMMT (organo-monmorilonit) dan getah asli terepoksida (ENR) telah
dihasilkan dengan menggunakan kaedah penyemperitan berskru kembar
pusingan searah. Ujian regangan ke atas sistem epoksi yang dihasilkan
menunjukkan modulus Young bagi komposit hibrid epoksi adalah lebih
tinggi daripada resin tanpa pengisi dan nilai modulus didapati meningkat
dengan peningkatan komposisi OMMT dalam matriks (setinggi 40% peningkatan).
Hal ini dipercayai adalah disebabkan oleh sifat tegar lapisan MMT.
Sementara itu, peningkatan luas permukaan kawasan antara fasa ekoran
kehadiran fasa penambah didapati telah mengurangkan tegasan alah
dan terikan akhir komposit hibrid yang dihasilkan. Pemeriksaan mikrostruktur
komposit hibrid epoksi melalui TEM dan XRD mendedahkan taburan OMMT
dalam matriks epoksi dengan susunan interkalasi dan pengelupasan.
Analisis DSC ke atas sampel yang termatang menunjukkan bahawa Tg
sistem komposit hibrid adalah rendah berbanding dengan sistem perduaan
(E5B dan E5LE). Pengurangan ketumpatan taut silang disyaki merupakan
punca penyusutan Tg ini.
Kata kunci: Getah asli
terepoksida; komposit epoksi; organo-monmorilonit; penyemperitan berskru kembar
ABSTRACT
OMMT
(organo-montmorillonite) and epoxidized natural rubber (ENR) filled
epoxy hybrid composites were produced via co-rotating twin-screw
extrusion technique. Tensile test on the epoxy composites systems
shows that the Young's modulus of the epoxy hybrid composites were
higher than the Young's modulus of unfilled epoxy and the value
of the modulus were found to be increasing with the increase of
OMMT composition in the matrix (exceeding 40% increment). This finding
is believed to be attributed to the stiff characteristic of MMT.
Meanwhile, the presence of fillers resulted in the decrement of
yeild stress and strain at break of the hybrid composites. Microstructure
examination on the hybrid composites via TEM and XRD techniques
showed that the distribution of OMMT in the matrix consist of intercalation
and exfoliation. DSC analysis on the cured sample showed that the
Tg of the hybrid system is lower than the binary system
(E5B and E5LE). It was suggested that the decrement of the cross
link density is the reason for the decline in Tg.
Keywords: Epoxidized natural rubber; epoxy composites; organo-monmorillonite;
twin screw extruder
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*Pengarang untuk surat-menyurat; email: seyong01my@yahoo.co.uk
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