아크릴 아미드계 공중합체에 의한 액정의 분산 안정성

박수진; 김문한; 이재락

Polymer(Korea), Vol.23, No.2, 213-219, March, 1999

Export Citation

아크릴 아미드계 공중합체에 의한 액정의 분산 안정성

Stabilization of Liquid Crystal Dispersions with Acrylamide Copolymers

박수진, 김문한, 이재락

초록

수용성 고분자인 acrylamide와 소수성 단량체인 styrene 및 methyl methacrylate를 공중합한 다음. 네마틱 액정 혼합물인 E-7을 분산시키고 nematic curvilinear aligned phase(NCAP)방법을 이용하여 수분산된 액정의 안정성을 조사하였다. 분산된 액정의 입체 안정성은 액정표면에 공중합체의 소수성 사슬이 선택적으로 흡착되어, 경계면을 형성함으로서 향상되었음을 계면장역의 액정 크기의 감소로 확인할 수 있었다. 계면장역. 응집시간 및 침강층 두께 실험 등으로부터 소수성 사슬들과 액정의 결합은 액정과 친수성 고분자간의 anchoring 효과를 감소시키는 역할을 함을 확인할 수 있었다.

The effects of hydrophobic moieties (styrene and methyl methacrylate) on the stability of a liquid crystal (LC, E-7)-in--water dispersion stabilized by copolymers of hydrophilic acrylamide with hydrophobic monomers have been studied in terms of nematic curvilinear aligned phase (NCAP) system, It was observed that the preferential adsorption hydrophobic moieties onto LC droplet surface resulted in steric stabilization of the dispersion, due to increasing the interfacial tension of LC and reducing the LC droplet size. According to the interfacial tension, coalescence time, and sedimented layer thickness measurements, it was proposed that the presence of hydrophobic moieties allows to form the apolar microenvironment in the round of LC droplet and finally reduces the anchoring effect between LC and the polymeric wall.

Keywords:acrylamide copolymers;liquid crystal;steric stabilization;adsorption

[References]

Fergason JL, SID Int. Symp. Dig. Tech. Paper, 16, 68 (1985)
Drzaic PS, J. Appl. Phys., 60, 2142 (1986)
Doane JW, MRS Bull., Jan., 22 (1991)
Ono H, Kawatsuki N, Jpn. J. Appl. Phys., 33, 6268 (1994)
West JL, Mol. Cryst. Liq. Cryst., 157, 427 (1988)
Kitzerow HS, Liq. Cryst., 16, 1 (1994)
Coates D, Displays, 14, 94 (1993)
Kawatsuki N, Ono H, J. Appl. Polym. Sci., 55(6), 911 (1995)
Tadros T, Vincent B, "Encyclopedia of Emulsion Technology," ed. by P. Becher, vol. 1, Chap. 3, Dekker, New York (1982)
Kim A, Park SJ, Lee JR, J. Colloid Interface Sci., 197(1), 119 (1998)
Glass E, "Polymers in Aqueous Media," ACS, Washington (1989)
Adamson AW, "Physical Chemistry of Surface," 5th ed., Wiley, New York (1990)
Sharma MK, Srivastava SN, Colloid Polym. Sci., 255, 45 (1977)
March GC, Napper DH, J. Colloid Interface Sci., 61, 383 (1977)
Park SJ, Brendle M, J. Colloid Interface Sci., 188(2), 336 (1997)
Ji Y, Kelly JR, West JL, Liq. Cryst., 14, 1885 (1993)

[Referenced By]

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

[2] Drzaic PS, J. Appl. Phys., 60, 2142 (1986)

[3] Doane JW, MRS Bull., Jan., 22 (1991)

[4] Ono H, Kawatsuki N, Jpn. J. Appl. Phys., 33, 6268 (1994)

[5] West JL, Mol. Cryst. Liq. Cryst., 157, 427 (1988)

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

[7] Coates D, Displays, 14, 94 (1993)

[8] Kawatsuki N, Ono H, J. Appl. Polym. Sci., 55(6), 911 (1995)

[9] Tadros T, Vincent B, "Encyclopedia of Emulsion Technology," ed. by P. Becher, vol. 1, Chap. 3, Dekker, New York (1982)

[10] Kim A, Park SJ, Lee JR, J. Colloid Interface Sci., 197(1), 119 (1998)

[11] Glass E, "Polymers in Aqueous Media," ACS, Washington (1989)

[12] Adamson AW, "Physical Chemistry of Surface," 5th ed., Wiley, New York (1990)

[13] Sharma MK, Srivastava SN, Colloid Polym. Sci., 255, 45 (1977)

[14] March GC, Napper DH, J. Colloid Interface Sci., 61, 383 (1977)

[15] Park SJ, Brendle M, J. Colloid Interface Sci., 188(2), 336 (1997)

[16] Ji Y, Kelly JR, West JL, Liq. Cryst., 14, 1885 (1993)