연결기가 반 유연성 액정중합체의 물성에 미치는 영향

박종률; 윤두수; 방문수; Jong-Ryul Park; Doo-Soo Yoon; Moon-Soo Bang

Applied Chemistry for Engineering, Vol.26, No.4, 445-451, August, 2015

DOI10.14478/ace.2015.1052 Export Citation

연결기가 반 유연성 액정중합체의 물성에 미치는 영향

Effect of Linkage Groups on the Properties of Semi-flexible Liquid Crystalline Polymers

박종률, 윤두수¹, 방문수 ^†

공주대학교 신소재공학부
¹조선이공대학교 생명환경화공과

Jong-Ryul Park, Doo-Soo Yoon¹, and Moon-Soo Bang^†

Division of Advanced Materials Science and Engineering, Kongju National University, Cheonan 331-717, Korea
¹Dept. of Bioenvironmental & Chemical Engineering, Chosun College of Science & Technology, Gwangju 501-744, Korea

E-mail:

초록

주사슬에 메소젠기와 유연격자로써 옥타메틸렌기를 포함하고 있는 반 유연성 액정중합체가 용액 중축합반응에 의하여 합성되었다. 중합체의 메소젠기는 에스터와 케톤, 에터, 설파이드, 메틸렌, 설폰, 또는 아이소프로필리덴기들에 의해 결합된 4개의 방향족고리로 되어 있다. 본 논문에서는, 메소젠기의 가운데 연결기가 중합체의 물성에 미치는 영향에 대하여 고찰하였다. 합성된 중합체의 구조와 성질은 1H-NMR, FT-IR, DSC, TGA, XRD, POM에 의하여 조사되었으며, 그 결과에 의하면, 굽은 구조의 연결기를 가지고 있는 중합체들은 낮은 열전이온도, 좁은 액정상 온도구간, 약한 액정성, 그리고 유기용매에 대한 좋은 용해성을 보여 주었고, 벌크한 연결기를 갖는 중합체들은 무정형 중합체로서 높은 유리전이온도(Tg)를 나타내었다.

Semi-flexible liquid crystalline polymers containing a mesogenic group and an octamethylene flexible spacer in the main chain were synthesized by solution polycondensation. The mesogenic group in the polymer consists of four aromatic rings connected by ester and ketone, ether, sulfide, methylene, sulfone, or isopropylidene linkage groups. This paper discusses effects of the central linker of the mesogenic group on polymer properties. The structures and properties of synthesized polymers were investigated by 1H-NMR, FT-IR, differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA), X-ray diffractometer (XRD), and polarizing optical microscope (POM). Polymers having bent linkage groups exhibited low thermal transition temperatures, narrow mesophase temperature ranges, low liquid crystallinity, and good solubilities in organic solvents, while those having bulky linkage groups were amorphous and exhibited high glass transition temperatures.

Keywords:aromatic;flexible spacer;linkage group;liquid crystalline polymer;mesogenic unit

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[Related Articles]

[1] Shung TS, Polym. Eng. Sci., 26, 901 (1986)

[2] Kwon YW, Choi DH, Jin JI, Polym.(Korea), 29(6), 523 (2005)

[3] Kim DY, Polym. Sci. Technol., 2(6), 415 (1991)

[4] Jackson WJ, Kuhfuss HF, J. Polym. Sci., 14, 2043 (1976)

[5] Roviello A, Sirigu A, Macromol. Chem. Phys., 183, 895 (1982)

[6] Krigbaum WR, Kotek R, Ishikawa T, Hakemi H, Preston J, Eur. Polym. J., 20, 225 (1984)

[7] Ober CK, Jin JI, Lenz RW, Adv. Polym. Sci., 59, 103 (1984)

[8] Blumstein A, Thomas O, Macromolecules, 15, 1264 (1982)

[9] Corradini P, Vacctello M, Mol. Cryst. Liq. Cryst., 97, 119 (1983)

[10] Roviello A, Sirigu A, J. Polym. Sci. Polym. Lett., 13, 455 (1975)

[11] Khan AH, Intyn JEM, Milburn AH, Polymer, 24, 1610 (1983)

[12] Talukdar M, Int. J. Res. Rev. Appl. Sci., 8, 22 (2011)

[13] El-Hibri MJ, Nazabaj J, Equiazabal JI, Arzak A, Poly(ararylethersulfone) s, in Handbook of Thermoplastics, Olabisi O (ed.), 839, Marcel Dekker, NY, USA (1997).

[14] Kondo H, Sato M, Yokoyama K, Eur. Polym. J., 18, 181 (1982)

[15] Mehdipour-Ataei S, Hatami M, Mosslemin MH, Chin. J. Polym. Sci., 27, 781 (2009)

[16] Jin JI, Antoun S, Ober CK, Lenz RW, Brit. Polym. J., 12, 132 (1980)

[17] Griffin AC, Havens SJ, J. Polym. Sci. B: Polym. Phys., 19, 951 (1981)