Sains Malaysiana 39(5)(2010): 769–774

Effect of Phosphite Loading on the Mechanical and Fire Properties of Palm-Based Polyurethane

(Kesan Penambahan Fosfit ke Atas Sifat Mekanik dan  Pembakaran Poliuretana Asas Sawit)

Khairiah Haji Badri* & Amamer Musbah Redwan

School of Chemical Sciences and Food Technology

Faculty of Science and Technology

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E., Malaysia

Received: 14 April 2009 / Accepted: 18 August 2009

ABSTRACT

Fire-retarding polyurethane (PU) composite was produced by adding 2,4-ditert-butylphenyl phosphite (FR) to palm-based monoester resin with loading percentage of 0, 2, 4, and 6 wt%. The Shore D hardness index increased marginally with increasing FR content. However, the impact and flexural strengths decreased with increasing FR loading attributed to the weak interfacial bonding between FR and PU matrix. The fire test indicated lowering of burning rate (from 5.30 mm s^-1 to 2.80 mm s^-1) as the loading percentage of FR increased. The combustion enthalpy of the composites also decreased with higher loading percentage of FR.

Keywords: Burning rate; fire-retarding; palm-based polyurethane; phosphite

ABSTRAK

Komposit poliuretana (PU) berperencat api telah dihasilkan dengan menambahkan 2,4- ditertbutilfenil fosfit (FR) ke dalam resin monoester asas sawit dengan penambahan 0, 2, 4 dan 6 % bt. Indeks kekerasan Shore D meningkat dengan peningkatan komposisi FR. Walau bagaimanapun, kekuatan hentaman dan fleksuralnya menurun dengan penambahan FR akibat terhasilnya lekatan antaramuka yang lemah antara FR dan matrik PU. Ujian pembakaran menunjukkan kadar pembakaran menurun (daripada 5.30 mm s^-1 ke 2.80 mm s^-1) apabila penambahan FR ditingkatkan. Entalpi pembakaran komposit ini menurun dengan peratusan FR yang tinggi.

Kata kunci: Fosfit; kadar pembakaran; perencat api; poliuretana asas sawit

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*Corresponding author; email: kaybadri@ukm.my