단위체 서열이 다른 액정 코폴리에스테르의 합성 및 특성(I)

조철형; 김선일; 박기주; 최재곤; 최수경; 조병욱

Journal of the Korean Industrial and Engineering Chemistry, Vol.5, No.6, 998-1008, December, 1994

Export Citation

단위체 서열이 다른 액정 코폴리에스테르의 합성 및 특성(I)

Synthesis and Properties of Liquid Crystalline Copolyesters in Different Comonomer Sequences(I)

조철형, 김선일, 박기주, 최재곤, 최수경, 조병욱

초록

p-옥시벤조일, iso-나프탈렌, 디메틸 디실록실 그룹으로 이루어진 코폴리에스테르를 모노머 서열을 달리하여 용액중합으로 합성하고 이들의 특성을 비교하였다. iso-나프탈렌 그룹의 naphthalene은 1,4, 1,5, 2,6, 2,7 치환 단위를 사용하였다. 합성된 중합체의 고유점성도는 0.27∼0.42dl/g이었고, 2,7-ordered 코폴리에스테르를 제외한 모든 중합체는 양방성 네마틱 액정을 보였다. 중합체를 열처리한 결과는 분자량의 증가와 결정화도의 증가를 가져왔다. 또 ordered코폴리머와 random코폴리머의 열전이 온도, 열안정성, 결정화 거동, 액정성에서 많은 차이가 남을 관찰하였다.

Copolyeters consisted of p-oxybenzoly, naphthalene isomer and dimethyldisiloxyl group in different comonomer sequences were synthesized by solution polycondensation and characterized. The naphthalene isomers used in this study were of the 1,4 1,5, 2,6 and 2,7 naphthylene units. The inherent viscosities of the polymers were between 0.27∼0.42dl/g and all of the polymers with the exception of the 2,7-ordered copolyester, showed enantiotropic nematic behavior. Annealing the copolyesters resulted in increasing molecular weights and degree of crystallinity of crystallizable compositions. Ordered copolyesters exhibit significant differences in thermal transitional thermal stability, crystalline properties and liquid crystallinity when compared with the properties of the corresponding radom copolyesters.

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[4] Aguilera C, Ringsdorf H, Polym. Bull., 12, 93 (1984)

[5] Aguilera C, Bernal L, Polym. Bull., 12, 93 (1984)

[6] Krigbau WR, Hakemi H, Koteck R, Macromolecules, 18, 965 (1985)

[7] Rochow EG, Model FS, Plaste Kaat., 15, 466 (1968)

[8] Moore JS, Stupp SI, Macromolecules, 21, 1217 (1988)

[9] Jin JI, Chang JH, Macromolecules, 22, 4402 (1989)

[10] Higashi F, Mashimo T, Takahashi I, J. Polym. Sci. A: Polym. Chem., 24, 97 (1986)

[11] Higashi F, Mashimo T, J. Polym. Sci. A: Polym. Chem., 24, 1697 (1989)

[12] Wilchinsky ZW, J. Appl. Phys., 30, 792 (1959)

[13] Jin JI, Chang JH, Shim HK, Macromolecules, 22, 93 (1989)

[14] Jo BW, Jin JI, Lenz RW, Eur. Polym. J., 18, 233 (1982)

[15] Jo BW, Jin JI, Lenz RW, Polym.(Korea), 9(3), 230 (1985)

[16] Aguilera C, Bartulin J, Hisgen B, Macromol. Chem., 184, 253 (1983)

[17] Kotek R, Krigbaum WR, J. Polym. Sci. B: Polym. Phys., 26, 173 (1988)

[18] Martin DG, Stupp SI, Macromolecules, 21, 1222 (1988)