Article
  • Synthesis and Photoalignment of Soluble Polyimides Containing 4-Styrylpyridine Derivatives as Photoreactive Side Groups
  • Kim MW, Ahn DK, Lee DH, Park LS, Seo KH, Ha KR, Kim WS
  • 광반응 곁사슬기로서 4-스티릴피리딘유도체를 가지는 용해성 폴리이미드의 합성과 광배향
  • 김민우, 안득균, 이동호, 박이순, 서관호, 하기룡, 김우식
Abstract
Soluble aromatic polyimides bearing 4-(4-oxyalkyleneoxystryl)-pyridines (ethylene and hexylene) as photoreactive side groups were synthesized and characterized. The photoreactive polymers were soluble in various polar organic solvents and their films were easily formed by solution casting. The photoreactivities of the polymers in the film state were approximately 64% at an exposure energy of 1.5 J/cm2. Transmittances of the polymer films were about 85% after annealing at 200 ℃. Therefore, these polymers can be evaluated to be photoreactive polyimides with good transparency and solubility. The dichroic ratios of the polymers with ethylene and hexylene groups as the alkylene spacers were 0.023 and 0.026, respectively. The order parameters of 4'-pentyl-4-biphenylcarbonitrile as a liquid crystal (LC) in the film cells of the former and latter polymers were 0.50 and 0.52, respectively. These results indicate that the polymers show the effect of alkylene spacer on the photoalignments the LC in the film cells of the polymers was perpendicularly oriented to the electric vector of the linear polarized UV light (LPUVL).

광반응성 곁사슬기로서 4-(4-옥시알킬렌옥시스티릴)피리딘 (에틸렌 및 헥실렌)을 가지는 용해성 폴리이미드를 합성하였고 그 특성을 조사하였다. 합성한 광반응성 고분자들은 여러 가지 극성 유기 용매에 잘 녹았으며 이들 고분자는 용액법으로 쉽게 필름이 형성되었고 필름 상태에서 1.5 J/cm2의 광량을 받았을 때 64%정도 광반응이 진행되었다. 또한 이들 고분자의 필름은 투과율을 200 ℃에서도 85 %정도 유지하였다. 따라서 이들 고분자는 투명성과 용해성이 좋은 감광성 폴리이미드로 평가 될 수 있다. 알킬렌 스페이서로서 에틸렌기를 가지는 고분자와 헥실렌기를 가지는 고분자는 필름 상태에서 이색비가 각각 0.023과 0.026이었다. 선편광에 의해 광반응된 전자의 고분자와 후자의 고분자의 필름 셀에 주입된 액정의 질서 파라미터 값은 각각 0.50과 0.52였다. 이들 결과는 이들 고분자가 광배향에 알킬렌 스페이서 효과를 나타낸다는 것을 뜻한다. 이들 고분자에 의한 액정의 광배향은 선편광 자외선의 전기장 벡터에 대해 수직한 방향이었다.

Keywords: soluble polyimide film; liquid crystal; photoalignment; photoreactivity; 4-styrylpyridine

References
  • 1. Kimura T, Kim JY, Fukuda T, Matsuda H, Macromol. Chem. Phys., 203, 2344 (2002)
  •  
  • 2. Lee SW, Chang T, Ree M, Macromol. Rapid Commun., 22, 941 (2001)
  •  
  • 3. Schadt M, Schmitt K, Kozinkov V, Chigrinov V, Jpn. J. Appl. Phys., 31, 2115 (1992)
  •  
  • 4. Ichimura K, Akita Y, Akiyama H, Kudo K, Hayashi Y, Macromolecules, 30(4), 903 (1997)
  •  
  • 5. Schadt M, Seiberle H, Schuster A, Nature, 381(6579), 212 (1996)
  •  
  • 6. Irie M, Hirano Y, Hashimoto S, Hayashi K, Macromolecules, 14, 262 (1981)
  •  
  • 7. Ichimura K, Chem. Rev., 100(5), 1847 (2000)
  •  
  • 8. Kawatsuki N, Matsuyoshi K, Hayashi M, Takatsuka H, Yamamoto T, Chem. Mater., 12, 1549 (2000)
  •  
  • 9. Kawatsuki N, Kawakami T, Yamamoto T, Mol. Cryst. Liq. Cryst., 368, 525 (2001)
  •  
  • 10. Obi M, Marino S, Ichimura K, Macromol. Rapid Commun., 19, 643 (1998)
  •  
  • 11. Yamaki S, Nakagawa M, Ichimura K, Macromol. Chem. Phys., 202, 354 (2001)
  •  
  • 12. Wang Y, Xu C, Kanazawa A, Shino T, Ikeda T, J. Appl. Phys., 84, 1 (1998)
  •  
  • 13. Nishikawa M, West JL, Jpn. J. Appl. Phys., 38, L331 (1999)
  •  
  • 14. Nishikawa M, Kosa T, West JL, Jpn. J. Appl. Phys., 38, L334 (1999)
  •  
  • 15. Kim IH, Kim WS, Ha K, Polym.(Korea), 26(2), 209 (2002)
  •  
  • 16. Kim IH, Kim WS, Ha K, Polym.(Korea), 26(4), 431 (2002)
  •  
  • 17. Chen TA, Jen AK, Cai YM, Macromolecules, 29(2), 535 (1996)
  •  
  • 18. Kim WS, Ahn DK, Kim MW, Macromol. Chem. Phys.accepted
  •  
  • 19. Matsuura T, Hasuda Y, Nishi S, Yamada N, Macromolecules, 24, 5001 (1991)
  •  
  • 20. Bergmann ED, Pinchas S, J. Org. Chem., 15, 1184 (1950)
  •  
  • 21. Koo SY, Lee DH, Choi HJ, Choi KY, J. Appl. Polym. Sci., 61(7), 1197 (1996)
  •  
  • 22. Lee DH, Koo SY, Kim DY, Choi HJ, J. Appl. Polym. Sci., 76(2), 249 (2000)
  •  
  • 23. Mitsunobu O, Synthesis, 1 (1981)
  •  
  • 24. Kim WS, Jang HS, Hong KH, Seo KH, Macromol. Rapid Commun., 22, 825 (2001)
  •  
  • 25. Zhang AQ, Li XD, Nah CW, Hwang KJ, Lee MH, J. Polym. Sci. A: Polym. Chem., 41(1), 22 (2003)
  •  
  • 26. Kim WS, Lee JW, Kwak YW, Lee JK, Park YT, Yoh SD, Polym. J., 33, 643 (2001)
  •  
  • 27. Kim KH, Jang S, Harris FW, Macromolecules, 34(26), 8925 (2001)
  •  
  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2004; 28(4): 314-320

    Published online Jul 25, 2004

  • Received on Mar 9, 2004
  • Accepted on Jul 5, 2004