Effect Of Hard And Soft Segment Ratio To Vibration Damping Properties Of Polyurethane

Liew, Chin Chin (2017) Effect Of Hard And Soft Segment Ratio To Vibration Damping Properties Of Polyurethane. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 Pages) Effect Of Hard And Soft Segment Ratio To Vibration Damping Properties Of Polyurethane.pdf - Submitted Version Download (368kB)

Abstract

Vibration occur in machines, mechanical system which can lead to component or system failure. Crack and misalignment are common effect of vibration. Polyurethane (PU) can be used as damping material by convert vibration energy to other energy in vibration reduction. PU can be used to repair and seal crack of concrete, also as thermal isolation, insole of shoes, gasket, coating etc. This project aimed to : (i) develop a formulation of rigid polyurethane foam, (ii) to determine the effect hard and soft segments ratio to vibration response of rigid polyurethane foam and (iii) to investigate the effect of formulated polyurethane foam to vibration of steel. Isocyanate (MDI) was used as hard segment, polyol as soft segment and amine used as catalyst. Five samples were prepared by difference ratio of hard and soft segment while the catalyst content was fixed. FTIR analysis was performed to study formulation of PU’s functional group. Vibration testing was performed according to ASTM E756 where cantilever beam specimen excited by constant and random frequency respectively. Density measurement show that more polyol reduce the density. From the FTIR septrum, the important septrum of PU were observed at 3323 1/cm, 2938 1/cm and 2859 1/cm. By constant frequency at 10 Hz, PU 1 (27.5% polyol and 52.5% MDI) and PU 3 (32.5% polyol and 47.5% MDI) were found to have the lowest vibration magnitude of 0.67g and 0.69g respectively. In addition, PU 3 reduce vibration of steel at 10 Hz from 0.11g to 0.09g. Random vibration testing of steel show the highest magnitude of vibration at frequency 570 Hz and PU 3 reduce the magnitude from 0.29g to 0.011g. Therefore, the formulation of PU were succeessfully obtain, no significant effect of hard and soft segment ratio to vibration of PU and steel.

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