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Damping and Transmission Loss of Polyurethane Multi-Layer  

Lee Yong Geon (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Lim Yi Rang (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Kwon Oh Hyeong (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Yoon Kwan Han (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Publication Information
Polymer(Korea) / v.29, no.3, 2005 , pp. 300-303 More about this Journal
Abstract
Polyurethane multi-layer and foam multi-layer were prepared with PU1000 and PU2000 made by poly(propylene glycol) (PPG) having the molecular weight of 1000 and 2000 g/mol, respectively. The damping and transmission loss of these materials were compared with PU1000 used as a reference. The damping peak of polyurethane multi-layer was shifted to the lower temperature compared with PU1000, while the damping peak of polyurethane foam multi-layer was shifted to the higher temperature and broaden. In terms of noise reduction, the transmission loss of polyurethane multi-layer was effective at the specific frequency range such as less than 100 Hz and around 600 Hz compared with PU1000. The transmission loss of polyurethane foam multi-layer was most effective in the whole experimental frequency range.
Keywords
polyurethane; multi-layer; foam layer; damping; transmission loss.;
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