A mechanistic picture of the effects of rubbing on polyimide surfaces and liquid crystal pretilt angles

Journal of Applied Physics

Volumn 83, Issue 3, 1998, Pages 1270-1280

  Paek, S H ^a   Durning, C J ^a   Lee, K W ^b   Lien, A ^b  

^a Columbia University ^*  (United States)

^b IBM T J WATSON RESEARCH CENTER   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000079153     PISSN: 00218979     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.366825     Document Type: Article

References (64)

1. S. Morozumi, in Liquid Crystals: Applications and Uses, edited by B. Bahadur (World Scientific, Singapore, 1992), Vol. 1, p. 171.
2. S. Kobayashi and Y. Iimura, Proc. SPIE 2175, 122 (1994).
3. J. Corgnard, Mol. Cryst. Liq. Cryst. Suppl 1, 1 (1982).
4. T. Uchida and H. Seki, in Ref. 1, Vol. 3, p. 1.
5. T. Scheffer and J. Nehring, in Ref. 1, Vol. 3, p. 232.
6. N. A. J. M. van Aerle, J. SID 2, 41 (1994).
7. A. Lien, R. A. John, M. Angelopoulous, K.-W. Lee, H. Takano, and A. Takenaka, Appl. Phys. Lett. 67, 3108 (1995).
8. T. Sugiyama, Y. Toko, T. Hashimoto, K. Katoh, Y. Iimura, and S. Kobayashi, SID'94 Dig. 25, 919 (1994).
9. K.-W. Lee, A. Lien, J. Stathis, and S.-H. Paek, Jpn. J. Appl. Phys., Part 1 36, 3591 (1997).
10. K.-W. Lee, S.-H. Paek, A. Lien, C. J. Durning, and H. Fukuro, in Polymer Surfaces and Interfaces: Characterization, Modification, and Application, edited by K. L. Mittal and K.-W. Lee (VSP, Amsterdam, 1997), p. 295.
11. K.-W. Lee, S.-H. Paek, A. Lien, M. Angelopoulous, J. Stathis, H. Fukuro, and C. J. Durning, Proceedings of Asia Display 1995, p. 363.
12. M. Barmentlo, R. W. J. Hollering, and N. A. J. M. van Aerle, Phys. Rev. A 46, R4490 (1992).
13. X. Zhuang, L. Marrucci, and Y. R. Shen, Phys. Rev. Lett. 73, 1523 (1994).
14. M. E. Becker, R. A. Kilian, B. B. Kosmowski, and D. A. Mlynski, Mol. Cryst. Liq. Cryst. 132, 167 (1986).
15. D.-S. Seo, S. Kobayashi, M. Nishikawa, and Y. Yabe, Liq. Cryst. 19, 289 (1995).
16. D.-S. Seo, S. Kobayashi, and A. Mochizuki, Appl. Phys. Lett. 61, 2392 (1992).
17. M. Niskikawa, T. Miyamoto, S. Kawamura, Y. Tsuda, and N. Bessho, Proceedings of Japan Display 1992, p. 819.
18. J. Y. Huang, J. S. Li, Y.-S. Juang, and S.-H. Chen, Jpn. J. Appl. Phys., Part 1 34, 3163 (1995).
19. K.-Y. Han and T. Uchida, J. SID 3, 15 (1995).
20. D.-S. Seo, K. Araya, N. Yoshida, M. Nishikawa, Y. Yabe, and S. Kobayashi, Jpn. J. Appl. Phys., Part 2 34, L503 (1995).
21. A. J. Pidduck, G. P. Bryan-Brown, S. D. Haslam, R. Bannister, I. Kitely, T. J. McMaster, and L. Boogaard, J. Vac. Sci. Technol. A 14, 1723 (1996).
22. A. J. Pidduck, G. P. Bryan-Brown, S. D. Haslam, and R. Bannister, Liq. Cryst. 21, 759 (1996).
23. H. Kikuchi, J. A. Logan, and D. Y. Yoon, J. Appl. Phys. 79, 6811 (1996).
24. Y.-M. Zhu, L. Wang, Z.-H. Lu, Y. Wei, X.X. Chen, and J. H. Tang, Appl. Phys. Lett. 65, 49 (1994).
25. E. S. Lee, Y. Saito, and T. Uchida, Jpn. J. Appl. Phys., Part 2 32, L1822 (1993).
26. H. Kado, K. Yokoyama, and T. Tohda, Rev. Sci. Instrum. 63, 3330 (1992).
27. T. Ito, K. Nakasnishi, M. Nishigawa, Y. Yokoyama, and Y. Takeuchi, Polym. J. 27, 240 (1995).
28. H. Nejoh, Surf. Sci. 256, 94 (1991).
29. S. Ishihara, H. Wakemoto, K. Nakazima, and Y. Matsuo, Liq. Cryst. 4, 669 (1989).
30. K. Sakamoto, R. Arafune, N. Ito, S. Ushioda, Y. Suzuki, and S. Morokawa, J. Appl. Phys. 80, 431 (1996).
31. K. Sawa, K. Sugiyoshi, Y. Hirai, K. Tateishi, and T. Kamejima, Jpn. J. Appl. Phys., Part 1 33, 6273 (1994).
32. N. A. J. M. van Aerle, M. Barmentlo, and R. W. J. Hollering, J. Appl. Phys. 74, 3111 (1993).
33. J. M. Geary, J. W. Goodby, A. R. Kmetz, and J. S. Patel, J. Appl. Phys. 62, 4100 (1986).
34. M. F. Toney, T. P. Russel, J. A. Logan, H. Kikuchi, J. M. Sands, and S. K. Kumar, Nature (London) 374, 709 (1995).
35. E. S. Lee, P. Vetter, T. Miyashida, and T. Uchida, Jpn. J. Appl. Phys., Part 232, L1339 (1993).
36. K.-W. Lee, S.-H. Paek, A. Lien, C. J. Durning, and H. Fukuro, Macromolecules 29, 8894 (1996).
37. K.-W. Lee, S.-H. Paek, A. Lien, C. J. Durning, and H. Fukuro, SID'96 Dig. 27, 273 (1996).
38. T. Uchida, M. Hirano, and H. Sakai, Liq. Cryst. 5, 1127 (1989).
39. "Alkylated" means that the backbone incorporates a significant number of linear-alkyl (C12-C18) side chains.
40. In applications the fully aromatic materials are not used as alignment layers because their films have color and this results in low transmission of light. But, since these PIs are well characterized, they are often employed for the purpose of understanding.
41. T. J. Scheffer and J. Nehring, J. Appl. Phys. 48, 1783 (1977).
42. A. Lien, J. SID 1, 159 (1993).
43. M. Jiang, Z. Wang, R. Sun, K. Ma, R. Ma, and X. Huang, Jpn. J. Appl. Phys., Part 2 33, L1242 (1994).
44. S. Wu, Polymer Interface and Adhesion (Dekker, New York. 1982), p. 1.
45. H. Mada and T. Sonoda, Jpn. J. Appl. Phys., Part 2 32, L1245 (1993).
46. l∝ √M, where M is pile impression, which increases with rubbing force F (after Ref. 32).
47. M. Nakamura, J. Appl. Phys. 52, 4561 (1981).
48. S. Faetti, in Physics of Liquid Crystalline Materials, edited by I.-C. Khoo and F. Simoni (Gordon and Breach Science, Philadelphia, 1991), p. 301.
49. NI) of the LCs (103 and 35.5 °C for ZLI-5080 and 5CB, respectively). The "flow effect" means the nonuniform LC alignment due to LCs partially aligning along the filling direction, not along the rubbing direction, which occurs when rubbing is sufficiently weak.
50. NI (120 °C).
51. D.-S. Seo, S. Kobayashi, M. Nishikawa, E.-J. Hahn, and Y. Yabe, Mol. Cryst. Liq. Cryst. 275, 37 (1996).
52. A. Sugimura and O.-Y. Zhong-Can,Liq. Cryst. 14, 319 (1993).
53. It is well known that alkylated PIs produce higher pretilt angles than main-chain ones (refer to Refs. 10 and 36).
54. K. Shirota, M. Yaginuma, T. Sakai, K. Ishikawa, H. Takezoe, and A. Fukuda, Jpn. J. Appl. Phys., Part 1 35, 2275 (1996).
55. M. B. Feller, W. Chen, and Y. R. Shen, Phys. Rev. A 43, 6778 (1991).
56. P. Guyot-Sionnest, H. Hsiung, and Y. R. Shen, Phys. Rev. Lett. 57, 2963 (1986).
57. W. Chen, M. B. Feller, and Y. R. Shen, Phys. Rev. Lett. 63, 2665 (1989).
58. B. O. Myrvold and K. Kondo, Liq. Cryst. 18, 271 (1995).
59. S.-H. Paek, K.-W. Lee, A. Lien, and C. J. Durning, Proceedings of Euro-Display '96, p. 319.
60. The contact angles on the rubbed films also increase with the degree of the imidization.
61. B. O. Myrvold, Y. Iwakabe, S. Oh-Hara, and K. Kondo, Jpn. J. Appl. Phys., Part 1 32, 5052 (1993).
62. C. Nozaki, N. Imamura, and Y. Sano, Jpn. J. Appl. Phys., Part 1 32, 4352 (1993).
63. P. A. Gass, A. Mosley, B. M. Nicholas, J. T. Brown, C. P. Edwards, and D. G. McDonnell, SID'87 Dig. 18, 376 (1987).
64. M. Ree, T. L. Nunes, and D. P. Kirby, Polym. Prepr. Am. Chem. Soc. Div. Polym. Chem. 33, 309 (1992).