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Dendronized Polyimides Bearing Long-Chain Alkyl Groups and Their Application for Vertically Aligned Nematic Liquid Crystal Displays
Department of Biochemistry & Applied Chemistry, Kurume National College of Technology, 1-1-1 Komorino, Kurume, Fukuoka 830-8555, Japan
Ex-senior researcher of SAMSUNG Cheil Industries Inc. in Korea; Present address: Poonglim Apt 418-1801, Jung Ja-Dong, Jang An-Gu, Suwon-Shi, Kyunggi-Do, Korea.
Present address: Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Moto-oka 744, Nishi-ku, Fukuoka 819-0395, Japan.
* Author to whom correspondence should be addressed.
Received: 7 September 2009; in revised form: 11 November 2009 / Accepted: 18 November 2009 / Published: 19 November 2009
Abstract: Polyimides having dendritic side chains were investigated. The terphenylene diamine monomer having a first-generation monodendron, 3,4,5-tris(n-dodecyloxy)-benzoate and the monomer having a second-generation monodendron, 3,4,5-tris[-3’,4’,5’-tri(n-dodecyloxy)benzyloxy]benzoate were successfully synthesized and the corresponding soluble dendritic polyimides were obtained by polycondensation with conventional tetracarboxylic dianhydride monomers such as benzophenone tertracarboxylic dianhydride (BTDA). The two-step polymerizations in NMP that is a general method for the synthesis of soluble polyimides is difficult; however, the expected dendritic polyimides can be obtained in aromatic polar solvents such as m-cresol and pyridine. The solubility of these dendoronized polyimides is characteristic; soluble in common organic solvents such as dichloromethane, chloroform, toluene and THF. These dendronized polyimides exhibited high glass transition temperatures and good thermal stability in both air and under nitrogen. Their application as alignment layers for LCDs was investigated, and it was found that these polyimides having dendritic side chains were applicable for the vertically aligned nematic liquid crystal displays (VAN-LCDs).
Keywords: polyimide; soluble polyimide; long-chain alkyl group; dendronized polyimide; alignment layers; vertically aligned nematic liquid crystal displays
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Tsuda, Y.; OH, J.M.; Kuwahara, R. Dendronized Polyimides Bearing Long-Chain Alkyl Groups and Their Application for Vertically Aligned Nematic Liquid Crystal Displays. Int. J. Mol. Sci. 2009, 10, 5031-5053.
Tsuda Y, OH JM, Kuwahara R. Dendronized Polyimides Bearing Long-Chain Alkyl Groups and Their Application for Vertically Aligned Nematic Liquid Crystal Displays. International Journal of Molecular Sciences. 2009; 10(11):5031-5053.
Tsuda, Yusuke; OH, Jae Min; Kuwahara, Renpei. 2009. "Dendronized Polyimides Bearing Long-Chain Alkyl Groups and Their Application for Vertically Aligned Nematic Liquid Crystal Displays." Int. J. Mol. Sci. 10, no. 11: 5031-5053.