New Liquid Crystals and Liquid Crystalline Thermosets Based on Wholly Aromatic Rigid-rod Mesogens

Hyun-Gon Moon; Myung-Sup Jung; Jin-Hae Chang

Macromolecular Research, Vol.19, No.1, 2-7, January, 2011

DOI10.1007/s13233-011-0108-5 Export Citation

New Liquid Crystals and Liquid Crystalline Thermosets Based on Wholly Aromatic Rigid-rod Mesogens

Hyun-Gon Moon, Myung-Sup Jung¹, and Jin-Hae Chang^†

Department of Polymer Science and Engineering, Kumoh National Institute of Technology, Gumi, 730-701, Korea
¹Advanced Materials Lab, Samsung Advanced Institute of Technology, Yongin, 446-712, Korea

E-mail:

A series of new liquid crystals (LCs) and liquid crystalline thermosets (LCTs) were prepared from wholly aromatic mesogens containing 2,6-naphthalene diol (2,6-ND), 2,7-naphthalene diol (2,7-ND), hydroquinone (HQ), and biphenol (BP). Cross-linked LCTs were obtained by crosslinking their citraconimide reactive end groups under a range of heat treatment conditions. The LCs and cross-linked LCTs were characterized by Fourier transform infrared (FTIR) spectroscopy, 1H nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), polarizing optical microscopy (POM) with a hot stage, and wide angle X-ray diffraction (WAXD). All LCs were thermotropic and formed a Schlieren nematic texture. The LCTs did not exhibit a liquid crystalline mesophase, which indicates that they are non-mesogenic phases.

Keywords:liquid crystal;liquid crystalline thermoset;mesophase;reactive end group.

[References]

Joseph EG, Wilkes GL, Baird DG, Polymeric Liquid Crystals, New York, Plenum Press, 1985.
Jin JI, Chang JH, Shim HK, Macromolecules, 22, 93 (1989)
Barclay GG, Ober CK, Prog. Polym. Sci, 18, 899 (1993)
Jin JI, Kang CS, Prog. Polym. Sci, 22, 937 (1997)
Somma E, Nobile MR, Macromol. Symp., 228, 71 (2005)
Hoyt AE, Benicewicz BC, J. Polym. Sci. A: Polym. Chem., 28, 3403 (1990)
Hoyt AE, Benicewicz BC, J. Polym. Sci. A: Polym. Chem., 28, 3417 (1990)
Stenzenberger HD, Compos. Struct., 24, 219 (1993)
Frich D, Economy J, J. Polym. Sci. A: Polym. Chem., 35(6), 1061 (1997)
Shiota A, Ober CK, Prog. Polym. Sci, 22, 975 (1997)
Douglas EP, Langlois DA, Benicewicz BC, Chem. Mater., 6, 1925 (1994)
Carfagna C, Amendola E, Giamberini M, Liq. Cryst., 13, 571 (1993)
Mormann W, Brocher M, Polymer, 39(25), 6597 (1998)
Lee JY, J. Appl. Polym. Sci., 402, 1712 (2006)
Gavrin AJ, Douglas EP, Macromolecules, 34(17), 5876 (2001)
Rao BS, J. Polym. Sci. Part C: Polym. Lett., 26, 3 (1988)
Andersson H, Gedde UW, Hult A, Polymer, 33, 4014 (1992)
Mormann W, Brahm M, Macromolecules, 24, 1096 (1991)
Tanaka M, Nakaya T, Macromol. Chem., 190, 3067 (1989)
Tang HY, Song NH, Gao ZH, Chen XF, Fan XH, Xiang Q, Zhou QF, Polymer, 48(1), 129 (2007)
Jin JI, Chang JH, Jo BW, Polym. Bull., 20, 525 (1988)
Ahn YH, Jung MS, Chang JH, Mater. Chem. Phys., in press.
Gavrin AJ, Curts CL, Douglas EP, J. Polym. Sci. A: Polym. Chem., 37(22), 4184 (1999)
Langlois DA, Benicewicz BC, Douglas EP, Chem. Mater., 10, 3399 (1998)
Su WFA, J. Polym. Sci. A: Polym. Chem., 31, 3251 (1993)
Holter D, Frey H, Mulhaupt R, Klee JE, Macromolecules, 29(22), 7003 (1996)
Holter D, Frey H, Mulhaupt R, Klee JE, Macromolecules, 29(22), 7003 (1996)

[Referenced By]

[Related Articles]

[1] Joseph EG, Wilkes GL, Baird DG, Polymeric Liquid Crystals, New York, Plenum Press, 1985.

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

[3] Barclay GG, Ober CK, Prog. Polym. Sci, 18, 899 (1993)

[4] Jin JI, Kang CS, Prog. Polym. Sci, 22, 937 (1997)

[5] Somma E, Nobile MR, Macromol. Symp., 228, 71 (2005)

[6] Hoyt AE, Benicewicz BC, J. Polym. Sci. A: Polym. Chem., 28, 3403 (1990)

[7] Hoyt AE, Benicewicz BC, J. Polym. Sci. A: Polym. Chem., 28, 3417 (1990)

[8] Stenzenberger HD, Compos. Struct., 24, 219 (1993)

[9] Frich D, Economy J, J. Polym. Sci. A: Polym. Chem., 35(6), 1061 (1997)

[10] Shiota A, Ober CK, Prog. Polym. Sci, 22, 975 (1997)

[11] Douglas EP, Langlois DA, Benicewicz BC, Chem. Mater., 6, 1925 (1994)

[12] Carfagna C, Amendola E, Giamberini M, Liq. Cryst., 13, 571 (1993)

[13] Mormann W, Brocher M, Polymer, 39(25), 6597 (1998)

[14] Lee JY, J. Appl. Polym. Sci., 402, 1712 (2006)

[15] Gavrin AJ, Douglas EP, Macromolecules, 34(17), 5876 (2001)

[16] Rao BS, J. Polym. Sci. Part C: Polym. Lett., 26, 3 (1988)

[17] Andersson H, Gedde UW, Hult A, Polymer, 33, 4014 (1992)

[18] Mormann W, Brahm M, Macromolecules, 24, 1096 (1991)

[19] Tanaka M, Nakaya T, Macromol. Chem., 190, 3067 (1989)

[20] Tang HY, Song NH, Gao ZH, Chen XF, Fan XH, Xiang Q, Zhou QF, Polymer, 48(1), 129 (2007)

[21] Jin JI, Chang JH, Jo BW, Polym. Bull., 20, 525 (1988)

[22] Ahn YH, Jung MS, Chang JH, Mater. Chem. Phys., in press.

[23] Gavrin AJ, Curts CL, Douglas EP, J. Polym. Sci. A: Polym. Chem., 37(22), 4184 (1999)

[24] Langlois DA, Benicewicz BC, Douglas EP, Chem. Mater., 10, 3399 (1998)

[25] Su WFA, J. Polym. Sci. A: Polym. Chem., 31, 3251 (1993)

[26] Holter D, Frey H, Mulhaupt R, Klee JE, Macromolecules, 29(22), 7003 (1996)

[27] Holter D, Frey H, Mulhaupt R, Klee JE, Macromolecules, 29(22), 7003 (1996)