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Fabrication of Polyurethane-sheet Acoustic Windows and Their Mechanical and Acoustic Properties in Water  

Cho, Mi-Suk (School of Chemical Engineering, Sungkyunkwan University)
Choi, Chae-Seok (School of Chemical Engineering, Sungkyunkwan University)
Lee, So-Jung (Department of Physics, Sungkyunkwan University)
Yoon, Suk-Wang (Department of Physics, Sungkyunkwan University)
Koo, Ja-Chun (Department of Mechanical Engineering, Sungkyunkwan University)
Lee, Young-Kwan (School of Chemical Engineering, Sungkyunkwan University)
Publication Information
Polymer(Korea) / v.34, no.2, 2010 , pp. 104-107 More about this Journal
Abstract
Polyurethane (PU) sheets were fabricated by the reaction of polypropylene glycol (PPG) and liquid diphenyl methane diisocyanate (L-MDI) with various trimethylol propane (TMP) contents. The $T_g$ value was varied from 34.8 $^{\circ}C$ to 49.9 $^{\circ}C$ according to the TMP content. As the content of TMP was increased from 4 to 12 wt%, the modulus of the PU sheet was increased from 322 MPa to 423 MPa, its tensile strength was increased from 10.6 MPa to 14.8 MPa, and its elongation was decreased from 62.8% to 49%. In case of acoustic properties, the sound speed of PU sheet was increased while its attenuation coefficient was decreased as the content of TMP was increased. The fabricated PU sheet was stable in water bath for 4 weeks.
Keywords
PU sheet; crosslinking; acoustic window; attenuation coefficient;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By Web Of Science : 0  (Related Records In Web of Science)
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1 J. D. Ferry, Viscoelestic Properties of Polymer, Wiley & Sons, New York, 1980.
2 Y. G. Lee, Y. R. Lim, O. H. Kwon, and K. H. Yoon, Polymer (Korea), 29, 300 (2005).   과학기술학회마을
3 K. I. Lee, H. S. Roh, and S. W. Yoon, J. Acoust. Soc. Am., 113, 2933 (2003).   DOI   ScienceOn
4 T. S. Kim, G. S. Lee, B. Y. Ahn, and J. H. Lee, J. Acoust. Soc. Korea, 19, 40 (2000).
5 B. Hartmann, "Acoustic Properties", in Encylopedia of Polymer Science and Engineering, Wiley & Sons, New York. 1984.
6 C. A. Trask, D. A. Thomas, E. C. Hickey, and L. H. Sperlin, J. Appl. Polym. Sci., 19, 1731 (1989).
7 P. K. Saxena, S. R. Srinivasan, J. Hrouz, and M. Ilavsky, J. Appl. Polym. Sci., 44, 1343 (1992).   DOI
8 H. Weibo and Z. Fenchang, J. Appl. Polym. Sci., 50, 277 (1993).   DOI   ScienceOn
9 K. H. Yoon, S. T. Yoon, and D. S. Bang, Fibers and Polymers. 4, 49 (2003).   DOI   ScienceOn
10 L. H. Sperling, Introduction to Physical Polymer Science, Wiley & Sons, New York ,1986.