We have synthesized novel mono-substituted acetylenes with a liquid crystalline azobenzene moiety in the side group such as 5-[4-(4'-alkylphenylaso) phenoxy]-1-pentyne(alkyl group H, pentyl, etc.) and then polymerized them with Ziegler-Natta(Fe(acac)₃-AIEt₃3), metathesis(WCl₆ , MoCl₅), and [Rh(NBD)Cl]₂-Et₃N catalysts. Especially, the Rh complex catalyst containing benzene as a solvent produced a cia rich polymer with an extremely high yield of 97%. Spectroscopic characterizations of all polymers were also carried out in view of molecular weight, structure, and thermal history using GPC, FT-IR, ¹H, ¹³C-NMR, UV- visible, and DSC. Polyacetylene derivative having a pentylazobenzene group showed a smectic liquid crystalline phase with a fan-shaped texture through the Polarizing optical microscope measurement. Also, photoresponsive characteristics of all monomers and polymers upon the irradiation of a UV monochromatic light have been investigated.

5-[4-(4'-alkylphenylazo)phenoxyl-1-pentyne(alkyl group : H, pentyl, etc.)과 같은 아조벤젠 액정 moiety를 측쇄로 갖는 새로운 치환 아세틸렌을 합성하여 Ziegler-Natta (Fe( acac)₂-AlEt₃), metathesis(WCl₆, MoCl₅ ) 및 [Rh(NBD)Cl]₂-Et₃N 촉매를 가지고 중합하였다. 특히 Rh 착체 촉매는 벤젠을 용매로 사용하였을 때 97%의 매우 높은 수율로 cis rich 형태의고분자를 생성하였다. 고분자의 분자량, 구조 빛 열적 성질 등은 GPC, FT-IR, ¹H, ¹³C-NMR, UV-Visible 분광학 장치와 DSC를 사용하여 조사하였다.광현미경을 통해 pentylazobenzene기를 함유한 고분자가 부채꼴 조직을 나타내는 스멕틱 액정상을 가지는 것을 알 수 있었다. 또한 단파장의 자외선 조사시 고분자의 광응답성 특성에관해 조사하였다

Keywords: Ph comolex catalyst; oilyacetylene derivative; thermal history; kiquid crystalline; photoresponsiveness