화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.21, No.12, 1297-1304, December, 2013
DOI10.1007/s13233-013-1176-5  Export Citation
Photocure kinetics and control of LC microdroplets for acrylate-based polymer dispersed liquid crystal with different methacrylate contents
Jung-Dae Cho, Sang-Sub Lee, Yang-Bae Kim, and Jin-Who Hong1, †
  • Institute of Photonics & Surface Treatment, Q-Sys Co. Ltd., Gwangju, 500-460, Korea
  • 1Department of Polymer Science & Engineering, Chosun University, Gwangju, 501-759, Korea
E-mail:
This paper reports on the relationship between the photocure kinetics and the morphological properties of UV-curable acrylate-based polymer dispersed liquid crystal (PDLC) systems with the various 2-ethylhexylacrylate (2-EHA) and 2-ethylhexylmethacrylate (2-EHMA) contents using photo-differential scanning calorimetry (photo-DSC), Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). Photo-DSC analysis using an autocatalytic kinetics model demonstrated that the cure extent and cure rate gradually decreased and then leveled off as the concentration of 2-EHMA increased up to 25 wt%, which was well confirmed by using FTIR spectroscopy. The morphological observations revealed that increasing the 2-EHMA content increased the size of the LC droplets within the acrylate-based polymer matrix. Notably, there was a marked increase in the number of LC droplets larger than 10 μm in PDLC composites containing more than 20 wt% 2-EHMA, suggesting that the addition of more than 20 wt% 2-EHMA to the acrylate-based PDLC compounds is not desirable. The presence of 2-EHMA clearly affected the photocure behaviors of acrylate-based PDLC compounds, which interestingly means that the slow reactivity of methacrylate monomer could be simply used to control the phase separation rate and the microstructures of LC droplets of acrylate-based PDLC systems.
Keywords:photocure kinetics;polymer dispersed liquid crystal (PDLC);photo-DSC;autocatalytic kinetics model;LC droplets
  1. Coates D, Displays, 14, 94 (1993)
  2. Drzaic PS, Liquid Crystal Dispersions, World Scientific, Singapore, 1995.
  3. Hoyle CE, Lee TY, Roper T, J. Polym. Sci. A: Polym. Chem., 42(21), 5301 (2004)
  4. Doane JW, Liq. Cryst., 33, 1313 (2006)
  5. Wu BG, Erdmann JH, Doane JW, Liq. Cryst., 33, 1315 (2006)
  6. Senyurt AF, Warren G, Whitehead JB, Hoyle CE, Polymer, 47(8), 2741 (2006)
  7. Wang PC, MacDiarmid AG, Displays, 28, 101 (2007)
  8. Shim SS, Cho YH, Yoon JH, Kim BK, Eur. Polym. J., 45, 2184 (2009)
  9. Hadjichristov GB, Marinov YG, Petrov AG, Mol. Cryst. Liq. Cryst., 525, 128 (2010)
  10. Yaroshchuk O, Elouali F, Maschke U, Opt. Mater., 32, 982 (2010)
  11. Zhang W, Lin J, Yu T, Lin S, Yang D, Eur. Polym. J., 39, 1635 (2003)
  12. Yang D, Lin J, Li T, Lin S, Tian X, Eur. Polym. J., 40, 1823 (2004)
  13. Seok JW, Ryu HS, Seo HJ, Kim WS, Lee DH, Min KE, Seo KH, Kang IK, Park LS, Opt. Mater., 21, 633 (2002)
  14. Seok JW, Han YS, Kwon Y, Park LS, J. Appl. Polym. Sci., 99(1), 162 (2006)
  15. Li WB, Cao YB, Cao H, Kashima M, Kong LJ, Yang H, J. Polym. Sci. B: Polym. Phys., 46(13), 1369 (2008)
  16. Hirai Y, Niiyama S, Kumaim H, Gunjima T, Proc. SPIE, 1257, 2 (1990)
  17. Coates D, Greenfield S, Goulding M, Brown E, Nolan P, Proc. SPIE, 1911, 2 (1993)
  18. Bunning TJ, Natarajan LV, Tondiglia V, Sutherland RL, Vezie DL, Adams WW, Polymer, 36(14), 2699 (1995)
  19. White TJ, Guymon CA, Polym. Mater. Sci. Eng., 89, 452 (2003)
  20. Jung JA, Kim BK, Kim JC, Eur. Polym. J., 42, 2667 (2006)
  21. Hwang SH, Yang KJ, Woo SH, Choi BD, Kim EH, Kim BK, Mol. Cryst. Liq. Cryst., 470, 163 (2007)
  22. White TJ, Natarajan LV, Bunning TJ, Guymon CA, Liq. Cryst., 34, 1377 (2007)
  23. Jeon YJ, Bingzhu Y, Rhee JT, Cheung DL, Jamil M, Macromol. Theory Simul., 16, 643 (2007)
  24. Duran H, Meng S, Kim N, Hu J, Kyu T, Natarajan LV, Tondiglia VP, Bunning TJ, Polymer, 49(2), 534 (2008)
  25. Koo JJ, No YS, Jeon CW, Kim JH, Mol. Cryst. Liq. Cryst., 491, 58 (2008)
  26. No YS, Jeon CW, Mol. Cryst. Liq. Cryst., 513, 98 (2009)
  27. Abdoune FZ, Benkhaled L, Mechernene L, Maschke U, Phys. Procedia, 2, 643 (2009)
  28. Li WB, Zhang HX, Wang LP, Ouyang CB, Ding XK, Cao H, Yang H, J. Appl. Polym. Sci., 105(4), 2185 (2007)
  29. Li WB, Zhu MJ, Ding XK, Li BF, Huang W, Cao H, Yang Z, Yang H, J. Appl. Polym. Sci., 111(3), 1449 (2009)
  30. Kashima M, Cao H, Meng QY, Liu HJ, Wang D, Li FS, Yang HA, J. Appl. Polym. Sci., 117(6), 3434 (2010)
  31. Kim EH, Myoung SW, Lee WR, Jung YG, J. Korean Phys. Soc., 54, 1180 (2009)
  32. Myoung SW, Kim EH, Jung YG, Thin Solid Films, 519(5), 1558 (2010)
  33. Meng S, Duran H, Hu J, Kyu T, Natarajan LV, Tondiglia VP, Sutherland RL, Bunning TJ, Macromolecules, 40(9), 3190 (2007)
  34. Clark SC, Hoyle CE, Jonsson S, Morel F, Decker C, Polymer, 40(18), 5063 (1999)
  35. Cho JD, Ju HT, Hong JW, J. Polym. Sci. A: Polym. Chem., 43(3), 658 (2005)
  36. Cho JD, Kim YB, Ju HT, Hong JW, Macromol. Res., 13(4), 362 (2005)
  37. Cho JD, Ju HT, Park YS, Hong JW, Macromol. Mater. Eng., 291, 1155 (2006)
  38. Cho JD, Kim SH, Chang IC, Kim KS, Hong JW, Macromol. Res., 15(6), 560 (2007)
  39. Keenan MR, J. Appl. Polym. Sci., 33, 1725 (1987)
  40. Nam JD, Seferis JC, J. Appl. Polym. Sci., 50, 1555 (1993)
  41. Boey FYC, Qiang W, Polymer, 41(6), 2081 (2000)
  42. Grassino SB, Strumia MC, Couve J, Abadie MJM, Prog. Org. Coat., 37, 39 (1999)
  43. Allen NS, Johnson MS, Oldring PKT, Salim S, in Chemistry & Technology of UV & EB Formulation for Coatings Inks & Paints, Oldring PKT , Ed., SITA Technology, London, 1991, Vol. 2.