Mesogen을 포함하지 않은 액정 polyurethane의 합성과 열적성질에 관한 연구

이종백; 최대웅

Journal of the Korean Industrial and Engineering Chemistry, Vol.8, No.2, 339-346, April, 1997

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Mesogen을 포함하지 않은 액정 polyurethane의 합성과 열적성질에 관한 연구

Preparation and Properties of Liquid Crystalline Polyurethanes Containing No Mesogenic Unit

이종백, 최대웅

초록

액정 polyurethane은 DMF 용매중 1,4-bis(6-hydroxyhexoxy)benzene (BHB6)과 2,5-tolylene diisocyanate (2,5-TDI)를 중부가 반응에 의해서 합성하였다. 고유점도는 0.26, 0.42 ㎗/g였다. 생성된 polyurethane의 열적성질 및 구조확인은 DSC, 편광현미경, X-ray회절 그리고 ¹H-NMR 및 FT-IR에 의해 확인하였다 특히 분자량이 서로 다른 polyurethane 2,5-TD1/BHB6의 열적성질 및 물성에 대해서 비교 검토하였다. 고유점도가 [η]=0.26인 polyurethane 2,5-TDI/BHB6는 monotropic 액정성을 나타내었다. 이러한 것은 구조적으로는 mesogen을 포함하고 있지 않다. 예를 들면 LCPU-L(저분자량)은 T_I-LC(등방성액체상전이점-액정) 빛 T_LC-K(액정-결정)은 122℃부터 89℃까지 관찰되었다.

Liquid crystalline polyurethanes were prepared from 1,4-bis(6-hydroxyhexoxy)benzene (BHB6) and 2,5-tolylene diisocyanate (2,5-TDI) solution polymerization in dimethylformamide produced intrinsic viscosities in the range 0.26 and 0.42 ㎗/g. The polyurethanes were investigated by DSC, Polarizing microscopy, X-ray, ¹H-NMR and IR spectroscopy. Polyurethanes of two different molecular weights were studied in detail and these will be referred to as low molecular weight and high molecular weight. Polyurethane 2,5-TDI/BHB6 with [η]=0.26 ㎗/g prepared from BHB6 and 2,5-TDI, exhibited monotropic liquid crystallinity, although these polyurethanes contained no mesogenic core unit. For example, LCPU-L(low molecular weight) exhibited T_I-LC of 122℃ T_LC-K 89℃.

[References]

Wissbrum KF, Griffin AC, J. Polym. Sci. B: Polym. Phys., 20, 1835 (1982)
Jin JI, Antoum S, Ober C, Lenz RW, Br. Polym. J., 12, 132 (1980)
Uryu T, Song JC, Polym. J., 21, 977 (1987)
Pearson PG, "In Specialty Polymers," ; Dyson, R.W., Ed; Blackie: London, P. 150 (1987)
Iimura K, Koide N, Tanabe H, Takeda M, Makromol. Chem., 182, 2569 (1981)
Mormann W, Brahm M, Macromol. Chem. Phys., 196, 529 (1995)
Stenhouse PJ, Valles EM, Kantor SW, MacKnight WJ, Macromolecules, 22, 55 (1989)
Smyth G, Valles EM, Pollack SK, Grebowicz J, Stenhouse PJ, Hsu SL, MacKnight WJ, Macromolecules, 23, 3389 (1990)
Lee JB, Kato T, Yoshkda T, Uryu T, Macromolecules, 26, 4989 (1993)
Lee JB, Kato T, Ujiie S, Iimura K, Uryu T, Macromolecules, 28(7), 2165 (1995)
Lee JB, Kato T, Uryu T, Polym. J., 27, 664 (1995)
Lee JB, Song JC, Choi DW, J. Korean Soc. Dyers Finishers, 8, 1 (1996)

[Referenced By]

[1] Wissbrum KF, Griffin AC, J. Polym. Sci. B: Polym. Phys., 20, 1835 (1982)

[2] Jin JI, Antoum S, Ober C, Lenz RW, Br. Polym. J., 12, 132 (1980)

[3] Uryu T, Song JC, Polym. J., 21, 977 (1987)

[4] Pearson PG, "In Specialty Polymers," ; Dyson, R.W., Ed; Blackie: London, P. 150 (1987)

[5] Iimura K, Koide N, Tanabe H, Takeda M, Makromol. Chem., 182, 2569 (1981)

[6] Mormann W, Brahm M, Macromol. Chem. Phys., 196, 529 (1995)

[7] Stenhouse PJ, Valles EM, Kantor SW, MacKnight WJ, Macromolecules, 22, 55 (1989)

[8] Smyth G, Valles EM, Pollack SK, Grebowicz J, Stenhouse PJ, Hsu SL, MacKnight WJ, Macromolecules, 23, 3389 (1990)

[9] Lee JB, Kato T, Yoshkda T, Uryu T, Macromolecules, 26, 4989 (1993)

[10] Lee JB, Kato T, Ujiie S, Iimura K, Uryu T, Macromolecules, 28(7), 2165 (1995)

[11] Lee JB, Kato T, Uryu T, Polym. J., 27, 664 (1995)

[12] Lee JB, Song JC, Choi DW, J. Korean Soc. Dyers Finishers, 8, 1 (1996)