화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.17, No.1, 44-50, January, 2009
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Effects of Silicone Surfactant on the Cell Size and Thermal Conductivity of Rigid Polyurethane Foams by Environmentally Friendly Blowing Agents
Mi Sun Han, Seok Jin Choi, Ji Mun Kim, Youn Hee Kim, Woo Nyon Kim†, Heon Sang Lee1, and Joon Yong Sung2
  • Department of Chemical and Biological Engineering, Korea University, Seoul 136-713, Korea
  • 1Tech. Center, LG Chemical Ltd., Daejeon 305-343, Korea
  • 2Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
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Rigid polyurethane foams (PUF)s were synthesized with environmentally friendly blowing agents such as a cyclopentane/distilled water (10.0/1.0, pphp) mixture and distilled water only for four different silicone surfactants having different silicone/polyether ratios. An attempt was made to reduce the thermal conductivities of the PUF samples by varying the concentration and the silicone/polyether ratio of the various silicone surfactants. The scanning electron microscopy (SEM) results indicated an optimum concentration of the silicone surfactant of about 1.5 to 2.5 phpp for various surfactants to reduce the cell size and lower the thermal conductivity. The silicone surfactant having a higher silicone/polymer ratio showed a smaller cell size and, therefore, demonstrated the lower thermal conductivity of the PUF samples. From the relation between the thermal conductivity and the cell size of the PUF samples, the smaller cell size improved the thermal insulation property of the rigid PUF for both the PUF samples blown by the cyclopentane/distilled water (10.0/1.0, pphp) mixture and distilled water only. If the blowing agent is fixed, then the cell size is an important factor to decrease the thermal conductivity of the PUF samples. These results indicated that rigid PUF samples having lower thermal conductivity can be obtained by choosing a silicone surfactant containing a higher silicone/polyether ratio, as well as an optimum content of the surfactant.
Keywords:rigid polyurethane foam;silicone surfactant;blowing agent;thermal conductivity.
  1. Weaire D, Hutzler S, The Physics of Foams, Oxford University Press, New York, 1999
  2. Gibson LJ, Ashby MF, Cellular Solids, Cambridge University Press, New York, 1997
  3. Oertel G, Polyurethane Handbook, Hanser Publishers, New York, 1993
  4. Klempner D, Frisch KC, Handbook of Polymeric Foams and Foam Technology, Oxford University, New York, 1991
  5. Szycher M, Szycher’s Handbook of Polyurethanes, CRC Press LLC, Florida, 1999
  6. Yang YL, Gupta MC, Dudley KL, Lawrence RW, Adv. Mater., 17(16), 1999 (2005)
  7. Sarier N, Onder E, Thermochim. Acta, 454(2), 90 (2007)
  8. Seo WJ, Jung HC, Hyun JC, Kim WN, Lee YB, Choe KH, Kim SB, J. Appl. Polym. Sci., 90(1), 12 (2003)
  9. Yang KS, Guo X, Meng W, Hyun JY, Kang IK, Kim YI, Macromol. Res., 11(6), 488 (2003)
  10. Kim BK, Seo JW, Jeong HM, Macromol. Res., 11(3), 198 (2003)
  11. Kang SH, Ku DC, Lim JH, Yang YK, Kwak NS, Hwang TS, Macromol. Res., 13(3), 212 (2005)
  12. Subramani S, Lee JM, Kim JH, Cheong IW, Macromol. Res., 13(5), 418 (2005)
  13. Park HD, Bae JW, Park KD, Ooya T, Yui N, Jang JH, Han DK, Shin JW, Macromol. Res., 14(1), 73 (2006)
  14. Cha DI, Kim KW, Chu GH, Kim HY, Lee KH, Bhattarai N, Macromol. Res., 14(3), 331 (2006)
  15. Yun JK, Yoo HJ, Kim HD, Macromol. Res., 15(1), 22 (2007)
  16. Min BS, Ko SW, Macromol. Res., 15(3), 225 (2007)
  17. Sung CH, Lee KS, Lee KS, Oh SM, Kim JH, Kim MS, Jeong HM, Macromol. Res., 15(5), 443 (2007)
  18. Raghu AV, Jeong HM, Kim JH, Lee YR, Cho YB, Sirsalmath K, Macromol. Res., 16(3), 194 (2008)
  19. Jung HC, Kang SJ, Kim WN, Lee YB, Choe KH, Hong SH, Kim SB, J. Appl. Polym. Sci., 78(3), 624 (2000)
  20. Frisch KC, Saunders JH, Dekker M, Plastic Foams, New York, 1976
  21. Yoshimura H, Tamano Y, Okuzono S, J. Cell. Plast., 32, 367 (1996)
  22. Caproli G, Bernasconi R, Hamilton A, Van Liefferinge M, Barettini S, Cappella A, J. Cell. Plast., 35, 27 (1999)
  23. U. S. Environmental Protection Agency (www.epa.gov), Federal Register, Vol. 65, No. 243, Rules and Regulations, page 78980, December 18, 2000
  24. Ni P, Li J, Suo JS, Li SB, J. Appl. Polym. Sci., 94(2), 534 (2004)
  25. Seo WJ, Sung YT, Han SJ, Kim YH, Ryu OH, Lee HS, Kim WN, J. Appl. Polym. Sci., 101(5), 2879 (2006)
  26. Seo WJ, Sung YT, Kim SB, Lee YB, Choe KH, Choe SH, Sung JY, Kim WN, J. Appl. Polym. Sci., 102(4), 3764 (2006)
  27. Kim YH, Choi SJ, Kim JM, Han MS, Kim WN, Bang KT, Macromol. Res., 15(7), 676 (2007)
  28. Cao X, Lee LJ, Widya T, Macosko C, Polymer, 46(3), 775 (2005)
  29. Widya T, Macosko CW, J. Macromol. Sci. Part B: Polym. Phys., 44, 897 (2005)
  30. Zhang XD, Macosko CW, Davis HT, Nikolov AD, Wasan DT, J. Colloid Interface Sci., 215(2), 270 (1999)
  31. Grimminger J, Muha K, J. Cell. Plast., 31, 48 (1995)
  32. Randal MH, Silicone Surfactants, Marcel Dekker, Inc., New York, 1999
  33. Rutnakornpituk M, Ngamdee P, Phinyocheep P, Polymer, 46(23), 9742 (2005)
  34. Chen S, Hua ZJ, Fang Z, Qi GR, Polymer, 45(19), 6519 (2004)