Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Photopolymerization Kinetics of Urethane-acrylate Oligomer

우레탄-아크릴레이트 올리고머의 광경화 거동

  • Kim, In-Beom (Department of Fire Safety and Management, Kyungmin College) ;
  • Song, Bong Jin (Department of Chemical and Biochemical Engineering, Dongguk University) ;
  • Lee, Myung Cheon (Department of Chemical and Biochemical Engineering, Dongguk University)
  • 김인범 (경민대학 소방안전관리과) ;
  • 송봉진 (동국대학교 생명화학공학과) ;
  • 이명천 (동국대학교 생명화학공학과)
  • Received : 2005.07.28
  • Accepted : 2005.11.21
  • Published : 2006.02.10
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Abstract

The kinetics of photopolymerization of urethane-acrylate oligomer which has many applications in photopolymerizable adhesives was analysed to investigate the influence of polymerization temperature and functionality of oligomer using the autocatalytic model. It was revealed that the maximum polymerization rate decreased as the polymerization temperature increased. The reaction rate constant, k, showed little change with the increase in polymerization temperature, while exponents m and n exhibited an increase. These results could be related to the diffusion and mobility restriction of reactive species during the cross-linking reaction. The decrease in photopolymerization rate with increase of temperature was mainly controlled by the reaction order n.

광경화 접착제로 많이 사용되는 우레탄-아크릴레이트 올리고머의 광경화 거동을 자체촉매화 반응모델식을 통해 중합온도 및 올리고머의 관능성에 따른 영향을 확인하여 보았다. 중합온도가 증가함에 따라 최대중합속도는 감소하여 중합온도가 경화 거동에 대한 영향인자임을 확인할 수 있었으며, 반응속도상수 k는 온도증가에 따라 거의 일정한 값을 보이나 반응차수 m과 n은 증가하는 경향을 보였는데 이는 가교구조에 의한 반응성 기의 확산제한 및 유동성의 제한으로 인한 것으로 판단되어진다. 온도증가에 따른 중합속도의 감소는 주로 반응차수 n의 증가에 의해 진행되었다.

Keywords

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