Vibration damping characteristic and sound absorption of bio-polymer from waste cooking oil

Ab Latif, Najibah (2014) Vibration damping characteristic and sound absorption of bio-polymer from waste cooking oil. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Waste cooking oils are problematic disposal especially in the developed countries. Options for disposing of waste cooking oil are limited. Pouring waste cooking oil down to the drain or sewers leads to clog and odour as well as damage wastewater leading to problems for humanlife. Thus, in this research, vegetable waste cooking oil is used as raw material to produce foam. This foam was crosslink with flexible isocyanate type Polymethane Polyphenyl (Modify polymeric-MDI) or rigid isocyanate type Polymethane Polyphenyl Isocyanate (Diisocyanatediphenylmethane- MDI) and further processed into granulate (powder) to be able to hot compress by hot compression moulding technique. These fabricated samples were namely as hot bio-polymer flexible (HBF) and hot bio-polymer rigid (HBR). HBF or HBR samples with three different thickness/laminated structure namely as 5.4 mm (F1), 10.8 mm (F2), 16.2 mm (F3) as well as 5.4 mm (R1), 10.8 mm (R2), 16.2 mm (R3) respectively of each type cross linking agent (flexible and rigid) was examined by using vibration transmissibility test and sound absorption test. Vibration transmissibility test was generated at 1 mm, 1.5 mm, 0.1 g and 0.15 g base excitation while the mechanical properties were examined through compression test, thermogravimetric analysis (TGA) and density test. The morphological structure of HBF and HBR were observed by scanning electron microscope (SEM). The results showed that HBF is denser than HBR that is 1241.15 kg/m3 and 1183.4 kg/m3 respectively. Therefore, HBF gave higher damping ratio to transmit vibration with F1 revealed the most excellent vibration damping of 0.671 at 1.5 mm base excitation meanwhile, the vibration absorption of highest thickness gives highest percentage of increment of absorption for F3 and R3 with 95.9 % and 91.8 % respectively. The decreasing of HBF thickness evidently increased the damping ratio up to 45 %. R1 shows an excellent sound absorption coefficient (α) of 0.72 at highest frequency level (5000 Hz) but shifted to lower frequency of 2500 Hz down to 1900 Hz for higher thickness samples up to 16.8 mm with maximum α. In conclusion, this hot compression technique is useful as processing method as an alternative recycling for bio-polymer generated from recyclable of waste vegetable cooking oil.

Item Type:Thesis (Masters)
Subjects:T Technology > TP Chemical technology > TP1080-1185 Polymers and polymer manufacture
T Technology > TP Chemical technology > TP995-996 Utilization of wastes
ID Code:6326
Deposited By:Normajihan Abd. Rahman
Deposited On:09 Mar 2015 14:40
Last Modified:09 Mar 2015 14:40

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