방향족 액정동족체 및 Epoxy형 측쇄 액정고분자의 합성 및 성질(II.선형 및 가교형 측쇄 액정고분자)

안원술; 장진규; 금창대; 박이순

Journal of the Korean Industrial and Engineering Chemistry, Vol.9, No.1, 71-75, February, 1998

Synthesis and Properties of Liquid Crystal Compounds and Epoxy Resin Based Side Chain Liquid Crystal Polymers Ⅱ. Linear and Crosslinked Epoxy LC Polymers

안원술, 장진규, 금창대, 박이순

초록

LCD용의 재료로 사용하기 위하여 새로이 합성된 저분자 액정 중간체들을 이용하여 epoxy resin 구조를 근간으로 하는 측쇄형 선형액정 고분자 및 가교된 측쇄형 액정 고분자를 만들고 이 들의 액정특성에 대하여 조사하였다. Alkyl spacer의 길이가 다른 방향족 amine 말단의 방향족 저분자 액정(ALC(n))과 ethylene glycol diglycidylether로부터 합성된 선형 측쇄형 고분자액정은 DSC 및 편광현미경 관찰로부터 mesogen으로 쓰인 저분자 액정과 같이 네마틱 액정상을 보였으며 spacer -(CH₂)n-의 길이에 따라 액정상-등방상 전이온도(T_NI)는 even-odd현상을 나타내었다. 선형 및 가교형 측쇄 액정고분자의 T_NI는 저분자 액정의 그것에 비해 더 낮은 온도에서 나타났으며 또한 가교형 측쇄 액정고분자의 경우에는 가교제인 1,10-diaminodecane 사용량에 따른 T_g 및 T_NI의 변화폭이 그렇게 크지 않은 것이 관찰되었다.

Liquid crystalline compounds with amine terminal group and related linear and cross-linked liquid crystal polymers with epoxy resin structure were synthesized and characterized to develope matrix materials for polymer dispersed liquid display applications. Both linear and crosslinked side chain type liquid crystal polymers made with aromatic amine mesogens and ethylene glycol diglycidyl ether exhibited nematic texture as shown by polarized optical microscope(POM) and their transition temperatures were determined both by DSC and POM. Liquid crystal polymer samples also showed even-odd effect as the spacer length of aromatic amine mesogens were varied, however, the effect was samller than that of low molecular weight mesogens. Changes of nematic-to-isotropic transition(T_NI) of crosslinked type polymer liquid crystals were also disscussed in relation to the concentration change of crosslinking agent 1,10-diaminodecane.

[References]

Doane JW, Liquid Crystals-Applications and Uses, edited by B. Bahadur, World Scientific Publishing, 1, 361 (1990)
이근철, 강영채, "액정 일렉트로닉스의 기초와 응용," 기전 연구사 (1992)
Karin MA, "Electro-Optic Displays," Marcel Dekker, N.Y. (1992)
Bredas JL, Salaneck WR, Wegner G, "Organic Mataerials for Electronics," North-Holland (1994)
Fergason JL, SID Int. Symp. Dig. Tech., 16, 68 (1985)
Doane JW, Vaz NA, Wu BG, Zumer S, Appl. Phys. Lett., 48, 269 (1986)
Gunjima T, 고분자, 43, 293 (1994)
Kamada T, Japan Diaplay '92, Hiroshima, PD-12 (1992)
Wu BG, West JL, Doane JW, J. Appl. Phys., 62, 3925 (1987)
Doane JW, Golemme A, West JL, Whitehead JB, Wu BG, Mol. Cryst. Liq. Cryst., 165, 511 (1988)
Cada LG, Chien LC, Macromol. Chem. Phys., 195, 1733 (1994)
Chien LC, Lin C, Fredley DS, McCagar JW, Macromolecules, 25, 133 (1992)
Chien LC, Cada LG, Xie L, Liq. Cryst., 12, 853 (1992)
Lin CL, Chien LC, Macromol. Rapid Commun., 16, 869 (1995)
Kitzerow HS, Liq. Cryst., 16, 1 (1994)
Margerum JD, Lackner AM, Lamos E, Lim KC, Smith WH, Liq. Cryst., 5, 1477 (1989)
Ahn W, Kim CY, Kim H, Kim SC, Macromolecules, 25, 5002 (1992)

[1] Doane JW, Liquid Crystals-Applications and Uses, edited by B. Bahadur, World Scientific Publishing, 1, 361 (1990)

[2] 이근철, 강영채, "액정 일렉트로닉스의 기초와 응용," 기전 연구사 (1992)

[3] Karin MA, "Electro-Optic Displays," Marcel Dekker, N.Y. (1992)

[4] Bredas JL, Salaneck WR, Wegner G, "Organic Mataerials for Electronics," North-Holland (1994)

[5] Fergason JL, SID Int. Symp. Dig. Tech., 16, 68 (1985)

[6] Doane JW, Vaz NA, Wu BG, Zumer S, Appl. Phys. Lett., 48, 269 (1986)

[7] Gunjima T, 고분자, 43, 293 (1994)

[8] Kamada T, Japan Diaplay '92, Hiroshima, PD-12 (1992)

[9] Wu BG, West JL, Doane JW, J. Appl. Phys., 62, 3925 (1987)

[10] Doane JW, Golemme A, West JL, Whitehead JB, Wu BG, Mol. Cryst. Liq. Cryst., 165, 511 (1988)

[11] Cada LG, Chien LC, Macromol. Chem. Phys., 195, 1733 (1994)

[12] Chien LC, Lin C, Fredley DS, McCagar JW, Macromolecules, 25, 133 (1992)

[13] Chien LC, Cada LG, Xie L, Liq. Cryst., 12, 853 (1992)

[14] Lin CL, Chien LC, Macromol. Rapid Commun., 16, 869 (1995)

[15] Kitzerow HS, Liq. Cryst., 16, 1 (1994)

[16] Margerum JD, Lackner AM, Lamos E, Lim KC, Smith WH, Liq. Cryst., 5, 1477 (1989)

[17] Ahn W, Kim CY, Kim H, Kim SC, Macromolecules, 25, 5002 (1992)