Chemistry Reference
In-Depth Information
4. CONCLUSIONS
A series of fluorinated copolyimides derived from 4,4'-oxydiphthalic anhydride
(ODPA) with 4,4'-oxydianiline (ODA) and trifluoromethyl-containing aromatic
diamines were synthesized and characterized. Strong and flexible copolyimide
films could be produced by casting the copoly(amic acid) solution followed by
thermal imidization. The copolyimides exhibited high thermal stability and high
mechanical properties. The UV-visible absorption cut-off between 330-350 nm
and pretilt angles as high as 20° for nematic liquid crystals (NLC) were observed
for these copolyimides, and thus are considered good potential candidates for ad-
vanced liquid crystal display devices.
Acknowledgment
Funding from the National Natural Science Foundation of China (NSFC) for Dis-
tinguished Young Scholars (No. 59925310) is gratefully acknowledged.
REFERENCES
1. M.K. Ghosh and K.L. Mittal (Eds.),
Polyimides: Fundamentals and Applications
, Marcel Dek-
ker, New York (1996).
2. D. Wilson, H.D. Stenzenberger and P.M. Hergenrother (Eds.),
Polyimides
, Chapman & Hall,
New York (1990).
3. C. Feger, M.M. Khojasteh and J.E. McGrath (Eds.),
Polyimides: Materials, Chemistry and
Characterization
, Elservier, Amsterdam (1989).
4. K.L. Mittal (Ed.),
Polyimides: Synthesis, Characterization and Applications
: Vols 1&2, Plenum,
New York (1984).
5. M. Mistutake and M. Yoichi, Proc. Display Device'98, pp. 10-12 ( 1998).
6. U. Yasuhiro and M. Shoichi, Proc. SPIE, 3143, 2-8 (1997).
7. J. Janing, Appl. Phys. Lett., 21, 173 (1972).
8. J.H. Park, J.C. Jung, B.H. Sohn, S.W. Lee and M. Ree, J. Polym Sci., Part A: Polym. Chem. Ed,
39, 3622-3632 (2001).
9. J.H. Park, B.H. Sohn, J.C. Jung, S.W. Lee and M. Ree, J. Polym Sci., Part A: Polym. Chem. Ed,
39, 1800-1809 (2001).
10. B.S. Ban, Y.N. Rim and Y.B. Kim, Liquid Crystals, 27, 125-130 (2000).
11. M. Murata, M. Uchida, Y. Nakajima and K. Saitoh, Jpn. J. Appl. Phys., 32, L679 (1993).
12. M. Schadt, K. Schmitt, V. Kozinkov and V. Chigrinor, Jpn. J. Appl. Phys., 31, 2155 (1992).
13. N.A. Clark and S.T. Lagerwall, Appl. Phys. Lett. 36, 899 (1980).
14. D.S. Seo, K. Muroi and S. Kobayashi, Mol. Cryst. Liq. Cryst. 213, 223 (1992).
15. L. Li, J. Yin, Y. Sui, H.J. Xu, J.H. Fang, Z.K. Zhu and Z.G. Wang, J. Polym. Sci., Part A: Po-
lym. Chem. Ed, 38, 1943-1950 (2000).
16. A. Seeboth, Displays, 20, 131-136 (1999).
17. K.R. Brown, D.A. Bonnell and S.T. Sun, Liquid Crystals, 25, 597-601 (1998).
18. S.I. Kim, M. Ree, T.J. Shin and J.C. Jung, J. Polym. Sci., Part A: Polym. Chem. Ed, 37, 2909-
2921 (1999).
19. K.W. Lee, S.H. Paek, A. Lien, C. Durning and H. Fukuro, Macromolecules, 29, 8894 (1996).
20. S.I. Kim, M. Ree, T.J. Shin, J.C. Jung, J. Polym. Sci., Part A: Polym. Chem., 37, 2909-2921
(1999).
Search WWH ::
Custom Search