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Sains Malaysiana 42(4)(2013):
495–501
Effect
of Compatibilizer on the Dynamic Mechanical and
Electrical Properties of Kaolin
Clay
Reinforced EPDM Rubber
(Kesan Pengserasi Terhadap Sifat Mekanik dan Elektrik Dinamik Kaolin Bertetulang Getah EPDM)
Gautam Sarkhel* & Sanjay Manjhi
Department of Polymer Engineering, Birla Institute of
Technology, Mesra-835215,
Ranchi, Jharkhand, India
Diserahkan: 19 Jun 2011 / Diterima: 3 April
2012
ABSTRACT
Industrial pollution issue and dark colour of carbon black, clay based non black filler are getting more importance for
reinforcing elastomer. EPDM-Kaolin composites with various maleated EPDM concentration have been
prepared by mixing on a two roll mill. The rheometry data showed the optimum cure time increases with
increasing compatibilizer concentration without
decreasing torque value indicating that acidic functional groups comes from compatibilizer could retard cure rate and increase the
optimum cure time rather than change in the ultimate cure state. As the filler
concentration increases, the edge to edge and face to edge interaction between
filler and EPDM increases and the free volume between EPDM molecules is reduced, the storage modulus increases. Moreover,
the dynamic mechanical analysis also showed the increase in glass transition
temperature with increase in filler concentration due to the inter-tubular
diffusion of EPDM inside the clay. It was also observed that with
increasing filler concentration, the resistivity and dielectric strength
decreases and moreover with increasing compatibilizer concentration the resistivity decreases due to better dispersion of filler
helps to build conduction path. The morphological study also revealed that
homogeneity of filler dispersion increases with increase in compatibilizer concentration.
Keywords: Dielectric constant; dielectric strength; EPDM;
kaolin; resistivity
ABSTRAK
Isu pencemaran perindustrian dan warna gelap karbon hitam, tanah liat berasaskan pengisi bukan hitam semakin lebih penting untuk mengukuhkan elastomer. EPDM-Kaolin komposit dengan pelbagai kepekatan EPDM telah disediakan dengan mencampurkan dalam pengisar dua rol. Data menunjukkan peningkatan masa awet optimum dengan kepekatan pengserasi tanpa mengurangkan nilai tork yang menunjukkan bahawa asid kumpulan berfungsi daripada pengserasi boleh membantut kadar awetan dan meningkatkan masa penyembuhan optimum merubah keadaan penyembuhan. Apabila kepekatan pengisi meningkatkan interaksi tepi ke tepi dan antara muka pengisi dan EPDM bertambah dan isi padu bebas antara molekul EPDM dikurangkan dan penyimpanan modulus bertambah. Selain itu analisis mekanik dinamik juga menunjukkan peningkatan dalam suhu peralihan kaca dengan peningkatan kepekatan pengisi disebabkan resapan antara tiub EPDM di dalam tanah liat. Dengan peningkatan kepekatan pengisi, kerintangan dan kekuatan dielektrik berkurangan dengan kepekatan pengserasi yang meningkat, kerintangan berkurangan disebabkan penyebaran pengisi yang lebih baik membantu untuk membina rangkaian pengaliran. Kajian morfologi juga mendedahkan bahawa kehomogenan penyebaran pengisi meningkat dengan peningkatan dalam kepekatan pengserasi.
Kata kunci: EPDM; kaolin; kekuatan dielektrik; kerintangan; pemalar dielektrik
RUJUKAN
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*Pengarang untuk surat-menyurat; email: gautamsarkhel@bitmesra.ac.in
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