Article
  • Synthesis and Properties of Novel Photoresponsive Polyacetylene derivatives with an Azobenzene Mesongenic Moiety in the Side Group
  • Oh SY, Hong SM, Oh SI
  • 측쇄로 아조벤젠 Mesogenic Moiety를 갖는 새로운 광응답성 폴리아세틸렌 유도체의 합성과 성질
  • 오세용, 홍승민, 오성일
Abstract
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

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1997; 21(6): 937-946

    Published online Nov 25, 1997