Abstract
The synthesis of three novel liquid crystalline monomers and their corresponding linear polymers is described. The chemical structures of the monomers M-1 to M-3 were confirmed by Fourier transform infrared (FT-IR) and proton nuclear magnetic resonance (1H NMR) spectroscopy. Their liquid crystalline properties and phase behavior were studied by polarizing optical microscopy (POM), differential scanning calorimetry (DSC), and thermogravimetric analyses (TGA). Monomers M-1 to M-3 and polymers P-1 to P-3 all exhibited nematic texture. Moreover, M-3 and P-3 also showed smectic A phase besides nematic phase. Experimental results demonstrated that the melting temperatures, glass transition temperatures, and clearing temperatures of M-1 to M-3 and P-1 to P-3 decreased with the spacer length from n = 0 to n = 6. TGA showed that the temperatures at which 5% weight loss occurred were greater than 275 °C for P-1 to P-3.
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References
H. Finkelmann, W. Meier, and H. Scheuermann, in “Liquid Crystals: Applications and uses”, B. Bahadur, ed., World Scientific, Publishing Company, Inc., Singapore, 1992, Vol.3, p 353.
G. G. Barclay and C. K. Ober, Prog. Polym. Sci., 18, 899 (1993).
A. P. Melissaris and M. H. Litt, Macromolecules, 27, 2675 (1994).
E. P. Douglass, D. A. Langlois, and B. C. Benicewicz, Chem. Mater., 6, 1925 (1994).
R. A. M. Hikmet and J. Lub, Prog. Polym. Sci., 21, 1165 (1996).
M. Freemantle, Chem. Eng. News, 74, 33 (1996).
A. Shiota and C. K. Ober, Prog. Polym. Sci., 22, 975 (1997).
M. Giamberini, E. Amendola, and C. Carfagna, Macromol. Chem. Phys., 198, 3185 (1997).
D. A. Langlois and B. C. Benicewicz, Chem. Mater., 10, 3393 (1998).
C. S. Hsu and W. L. Chen, J. Polym. Sci., Part A: Polym. Chem., 37, 3929 (1999).
E. J. Choi, H. K. Ahn, J. K. Lee, and J. I. Jin, Polymer, 41, 7617 (2000).
R. A. M. Hikmet, J. Lub, and J. Higgins, Polymer, 34, 1736 (1993).
A. B. Conciatori, E. W. Choe, and G. Farrow, U. S. Patent 4 514 553 (1985).
R. W. Stackman, U. S. Patent 4 683 327 (1987).
M. H. Litt, W. Whang, K. Yen, and X. Qian, J. Polym. Sci., Part A: Polym. Chem., 31, 183 (1993).
R. A. M. Hikmet and D. J. Broer, Polymer, 32, 1627 (1991).
B. C. Benicewicz, M. E. Smith, D. A. Langlois, A. J. Gavrin, and E. P. Douglas, Polym. Prepr. (Am. Chem. Soc., Div. Polym. Chem.), 38(1), 307 (1997).
H. R. Kricheldorf and A. Gerken, High Perform. Polym., 9, 75 (1997).
R. C. Domszy and P. J. Shannon, Macromolecules, 23, 2790 (1990).
J. J. Mallon and P. M. Adams, J. Polym. Sci., Part A: Polym. Chem., 31, 2249 (1993).
W. A. Su, J. Polym. Sci., Part A: Polym. Chem., 31, 3251 (1993).
A. E. Hoyt and B. C. Benicewicz, J. Polym. Sci., Part A: Polym. Chem., 28, 3403 (1990).
A. E. Hoyt and B. C. Benicewicz, J. Polym. Sci., Part A: Polym. Chem., 28, 3417 (1990).
J.-S. Hu, B.-Y. Zhang, Y.-G. Jia, and Y. Wang, Polym. J., 35, 160 (2003).
J.-S. Hu, B.-Y. Zhang, Z.-L. Feng, H.-G. Wang, and A.-J. Zhou, J. Appl. Polym. Sci., 80, 2335 (2001).
X.-Y. Yu and Y. Lu, “Polymer Chemistry”, Nanjing University Press, Nanjing, 1994, p 44.
L.-Y. Wang and S.-S. Liao, “Liquid Crystal Chemistry”, Scientific Press, Beijing, 1988, p 27.
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Hu, JS., Wang, Y., Zhang, BY. et al. Liquid Crystalline Thermosets I. Synthesis and Characterization of Liquid Crystalline Thermosets’ Precursor Polymers. Polym J 35, 728–733 (2003). https://doi.org/10.1295/polymj.35.728
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DOI: https://doi.org/10.1295/polymj.35.728