Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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In-situ Thermally Curable Hyper-branched 10H-butylphenothiazine

  • Jo, Mi-Young (Department of Polymer Engineering, Pukyong National University) ;
  • Lim, Youn-Hee (Samsung Advanced Institute and Technology) ;
  • Ahn, Byung-Hyun (Division of Advanced Materials and Engineering, Pukyong National University) ;
  • Lee, Gun-Dae (Department of Industrial Chemistry, Pukyong National University) ;
  • Kim, Joo-Hyun (Department of Polymer Engineering, Pukyong National University)
  • Received : 2011.10.07
  • Accepted : 2011.12.05
  • Published : 2012.02.20
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Abstract

A hyper branched 10-butylphenothiazine with in-situ thermally curable methacrylate (1,3,5-tris-[$\{$10-Butyl-3-(4-(2-methyl-acryloyloxy)-phenyl)-7-yl-10H-phenothiazine$\}$]-benzene, (tris-PTMA)) was synthesized successfully. From the TGA thermogram of tris-PTMA was thermally stable up to $336^{\circ}C$. In the first heating scan of DSC thermogram, tris-PTMA showed glass transition temperature (Tg) at $140^{\circ}C$ and broad endothermic process in the region of $144-179^{\circ}C$, which is thermally curing temperature. In the second heating process, $T_g$ exhibited at $158.7^{\circ}C$ and endothermic process was not observed. Thermally cured tris-PTMA showed no big change in the UV-visible spectrum after washing with organic solvent such as methylene chloride, chloroform, toluene, indicating that thermally cured film was very good solvent resistance. Thermally cured tris-PTMA was electrochemically stable and the HOMO energy level of tris-PTMA was -5.54 eV. The maximum luminance efficiency of double layer structured polymer light-emitting diode based on in-situ thermally cured tris-PTMA was 0.685 cd/A at 16.0 V, which was higher than that of the device without thermally cured tris-PTMA (0.348 cd/A at 15.0 V).

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