비페닐렌구조가 액정중합체의 성질에 미치는 영향

육경창; 신대윤; 신홍철; 김완영

Journal of the Korean Industrial and Engineering Chemistry, Vol.3, No.2, 280-287, June, 1992

Export Citation

비페닐렌구조가 액정중합체의 성질에 미치는 영향

Effects of Biphenylene Structure on the Properties of Liquid Crystalline Polymer

육경창, 신대윤, 신홍철, 김완영

초록

테레프탈산, 비페닐 디카르복시산과 히드로퀴논을 용액중합하여 전방향족 액정 폴리에스테르를 합성하고 테레프탈산과 비페닐 디카복시산의 몰비가 액정중합체의 열적성질, 열안정성 및 메소상의 구조에 미치는 영향을 DSC, TGA, 편광현미경 및 X선회절기로 조사하였다. 본 연구에서 합성한 중합체는 모두 열방성 액정중합체였고 네마틱 액정상을 나타내었으며, 용융온도 및 등방화온도는 중합체중의 비페닐렌구조가 증가함에 따라 약간씩 증가하였다. 또한 중합체의 열안정성은 중합체중의 비페닐렌구조가 증가함에 따라 개선되었으며, 비페닐렌구조를 가지는 중합체의 결정도는 상당히 높아서 약 33%정도로 나타났다.

Aromatic liquid crystalline polyesters were synthesized from terephthalic acid(TPA), biphenyl dicarboxylic acid(BPA) and hydroquinone(HQ) by solution polymerization. Effects of TPA/BPA ratio(by mole %) on the thermal properties, thermal stability and textures of mesophases were investigated with DSC, TGA, cross-polarized microscopy and X-ray diffractometer. The synthesized polymers in this study were thermotropic and showed nematic textures. Melting temperature(T_m) and isotropization temperature(T_i) of polymer increased and thermal stabilities of polymer were improved with the content of BPA. Most of the polymers in this study had crystallinity more than 30%.

[References]

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[1] Kwolek SL, U.S. Patent, 3,600,536 (1971)

[2] Kwolek SL, U.S. Patent, 3,671,542 (1972)

[3] Cottis SG, Economy J, Wohrer LC, U.S. Patent, 3,975,487 (1976)

[4] Jo BW, Lenz RW, Jin JI, Makromol. Chem. Rapid Commun., 3, 23 (1982)

[5] Lenz RW, Jin JI, Macromolecules, 14, 1405 (1981)

[6] Polk MB, Kamnappan V, Harruna I, Phingbodhipakkiya M, J. Polym. Sci. A: Polym. Chem., 24, 931 (1986)

[7] Jackson WJ, Br. Polym. J., 12, 154 (1980)

[8] Kricheldorf HR, Pakull R, Macromolecules, 21, 551 (1988)

[9] Watanabe J, Hayashi M, Macromolecules, 22, 4083 (1989)

[10] Percec V, Heck J, J. Polym. Sci. A: Polym. Chem., 29, 591 (1991)

[11] Laus M, Angeloni AS, Galli G, Chiellini E, Makromol. Chem., 191, 147 (1990)

[12] Schnabel W, "Polymer Degradation," p. 43, Hanser Press, Munchen (1981)

[13] 진정일, "액정중합체," p. 43, 민음사 (1986)

[14] Hall IH, "Structure of Crystalline Polymers," Elsevier, London (1984)