Sains Malaysiana 40(4)(2011): 373–378

Mechanical and Thermal Properties of Palm-Based Polyurethane  Composites Filled with Fe3O4, PANI and PANI/Fe3O4

(Sifat-sifat Mekanik dan Terma Komposit Poliuretana Sawit Berpengisi Fe₃O₄, PANI dan PANI/Fe₃O₄)

Liow Chi Hao¹, Khairiah Haji Badri² * & Sahrim Haji Ahmad¹

¹School of Applied Physics, Faculty of Science & Technology

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor D.E., Malaysia

²School of Chemical Sciences & Food Technology, Faculty of Science & Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E., Malaysia

Received: 7 January 2010 / Accepted: 21 June 2010

ABSTRACT

In-situ polymerization method was used to prepare palm-based polyurethane (PU) composites loading with 15 wt% magnetite (Fe₃O₄), polyaniline (PANI) and Fe₃O₄ coated with PANI labeled as PU15, PP and PPM, respectively. FTIR spectroscopy analysis indicated a shift in the carbonyl, C=O and NH in PP. The shift of the peak indicated that there was hydrogen bonding between the C=O (proton acceptor) of urethane with NH (proton-donator) of PANI. PPM gave the highest impact and flexural strengths at 4875 kJ/ m2 and 42 MPa, respectively but with the lowest flexural modulus (1050 MPa). Two-stage degradation behavior was observed in the TGA thermogram.

Keywords: Magnetite; mechanical properties; polyaniline; polyurethane; thermal property

ABSTRAK

Kaedah pempolimeran in-situ digunakan untuk menyediakan komposit poliuretana sawit (PU) dengan penambahan 15% bt. magnetit (Fe₃O₄), polianilina (PANI) dan Fe₃O₄ tersalut PANI berlabel masing-masing PU15, PP dan PPM. Analisis spektroskopi FTIR menunjukkan terdapat anjakan pada puncak karbonil C=O dan NH dalam PP. Anjakan puncak ini menunjukkan kehadiran ikatan hidrogen antara C=O (penerima proton) daripada uretana dan NH (penderma proton) daripada PANI. PPM memberikan kekuatan hentaman dan lenturan tertinggi pada masing-masing 4875 kJ/ m² dan 42 MPa tetapi dengan modulus lenturan terendah (1050 MPa). Peleraian dua peringkat diperhatikan dalam termogram TGA.

Kata kunci: Magnetit; polianilina; poliuretana; sifat mekanik; sifat terma

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*Corresponding author; email: kaybadri@ukm.my