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Ziegler-Natta와 Metathesis 촉매에 의한 측쇄형 액정폴리아세틸렌 유도체의 합성
Synthesis of Side-Chain Liquid Crystalline Polyacetylene Derivatives by Ziegler-Natta and Metathesis Catalysts
HWAHAK KONGHAK, February 1996, 34(1), 70-76(7), NONE
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Abstract
1-[p-(trans-4’-alkylcyclohexyl)phenoxy]alkyne, 5-p-pentylbiphenoxy-1-pentyne과 같은 액정 moiety를 갖는 새로운 치환아세틸렌을 합성하여, Ziegler-Natta와 metathesis 촉매로 중합하였다. GPC, IR, NMR, UV-Visible 분광학 장치를 사용하여 고분자의 분자량 및 구조를 조사하였다. 특히 Ziegler-Natta 촉매인 Fe(acac)3-AlEt3은 중량평균분자량이 2-3×106의 고분자량과 입체규칙성이 뛰어난 cis형 구조의 고분자를 생성하였다. 모든 고분자는 벤젠, 클로로포름, THF와 같은 유기용매에 용해되었다.
We have synthesized novel mono-substituted acetylenes with a liquid crystalline moiety such as 1-[p-(trans-4’-alkylcyclohexyl)phenoxy]alkynes and 5-p-pentylbiphenoxy-1-pentyne and then polymerized them with Zieg-ler-Natta and metathesis catalysts. Molecular weights and structure of these polymers were investigated by using GPC, IR, NMR and UV-visible spectroscopic measurements. Especially, Ziegler-Natta catalyst[Fe(acac)3-AlEt3] pro-duced an extremely high molecular weight polymer of Mw=2-3×106 and cis form polymer with a high stereoregularity. All polymers were soluble in organic solvents such as benzene, chloroform and THF.
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References
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Simonescu CI, Percec V, Prog. Polym. Sci., 8, 133 (1982)
Oh SY, Oguri F, Akagi K, Shirikawa H, J. Polym. Sci. A: Polym. Chem., 31, 781 (1993)
Akagi K, Hashimoto D, Shirakawa H, Isoya J, Synth. Met., 40, 197 (1991)
Oh SY, Akagi K, Shirakawa H, HWAHAK KONGHAK, presentation
