화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.10, No.6, 365-368, December, 2002
Export Citation
Effect of Polymerization Procedure on Thermal and Mechanical Properties of Polyether Based Thermoplastic Polyurethanes
Seong Geun Kim, and Dai Soo Lee†
  • Faculty of Chemical Engineering and Technology, Research Center of Industrial Technology, Chonbuk National University, Chonju 561-756, Korea
E-mail:
Thermoplastic polyurethanes (TPUs) with different hard segment length has been prepared from a fixed molar ratio of poly(tetramethylene ether glycol), 4,4'-diphenylmethane diisocyanate, and 1,4-butanediol by different polymerization procedures. Results reveal that the on-set temperature of exotherms (Tcc) due to the crystallization of hard segments by cooling the TPUs from melt and the peak temperature of endotherms due to the melting of hard segments (Tmh) by heating the TPUs increased and levelled off with increasing the hard segment length of TPUs. It has also been observed that soft segment glass transition temperature (Tgs) of TPU decreased slightly with increasing the hard segment length, which explains less mixing of soft segments and hard segments. In tensile measurement of TPUs, strain hardening is observed with increasing the hard segment length, which is attributed to the strain induced crystallization of soft segments.
Keywords:polyurethane;crystallization;mechanical property;thermal property;hard segment length
  1. Hepburn C, Polyurethane Elastomers, 2nd Edition, Elsevier, London (1991)
  2. Szycher M, Handbook of Polyurethane, CRC Press, London (1999)
  3. Dieterich D, hespe H, Polyurethane Handbook, 2nd Edition, G. Oertel, Ed., Hanser Publishers, Munich, Chapt. 2 (1993)
  4. Martin DJ, Meijs GF, Gunatillake PA, Mccarthy SJ, Renwick GM, J. Appl. Polym. Sci., 64(4), 803 (1997) 
  5. Miller JA, Lin SB, Hwang KKS, Wu KS, Gibson PE, Cooper SL, Macromolecules, 18, 32 (1985) 
  6. Abouzahr S, Wilkes GL, J. Appl. Polym. Sci., 29, 2695 (1984) 
  7. Ahn TO, Choi SC, Jeong HM, Cho K, Polym. Int., 31, 329 (1993)
  8. Martin DJ, Meijs GF, Renwick GM, Mccarthy SJ, Gunatillake PA, J. Appl. Polym. Sci., 62(9), 1377 (1996) 
  9. vanBogart JWC, Gibson PE, Cooper SL, J. Polym. Sci. B: Polym. Phys., 21, 65 (1983)
  10. Koberstein JT, Stein RS, J. Polym. Sci. A: Polym. Chem., 21, 1439 (1983)
  11. Leung LM, Koberstein JT, J. Polym. Sci. A: Polym. Chem., 23, 1883 (1985)
  12. vanBogart JWC, Bluemke DA, Cooper SL, Polymer, 22, 1427 (1981)
  13. Lai YC, Quinn ET, Valint PL, J. Polym. Sci. A: Polym. Chem., 33(11), 1767 (1995) 
  14. Koberstein JT, Galambos AF, Macromolecules, 25, 5618 (1992) 
  15. Eisenbach CD, Heinemann T, Ribbe A, Stadler E, Macromol. Symp., 77, 125 (1994)
  16. Choi DH, Kim JH, Cho KJ, Korea Polym. J., 8(4), 172 (2000)