Article
  • Preparation and Properties of Self-photocuring Poly(urethane acrylate)
  • Ahn BU, Jung JA, Lee JM, Jeong HM
  • 자가 광경화형 폴리(우레탄 아크릴레이트)의 합성과 물성
  • 안병욱, 정주애, 이준모, 정한모
Abstract
The intermediate, which can initiate photo-polymerization and has terminal hydroxyl groups to react with isocyanate groups to prepare polyurethane, was synthesized by Michael addition reaction. The polyurethane (PU) prepolymer containing this intermediate was end-capped with pentaerythritoltriacrylate to prepare poly(urethane acrylate) (PUA) oligomer which was self-curable without any additional photo-initiator. The PUA cured by ultraviolet irradiation has a single glass transition temperature. This temperature and rubbery plateau modulus were increased as the molecular weight of the PU prepolymer decreased and thus the crosslinking density of the cured PUA was increased. The cured PUAs had a balanced tensile property, exhibiting high tensile strength as well as high elongation at break, when the molecular weights of the PU prepolymers were 5000 or 10000. The cured PUA film was transparent and yellowing-resistant. The gloss and hardness at surface, and solvent resistance were enhanced as the crosslinking density of the cured PUA increased.

광중합 개시 기능을 가지면서, 말단에 하이드록실기를 가져 이소시아네이트와 반응을 하여 폴리우레탄 중합에 참여할 수 있는 중간체를 마이클 첨가반응으로 합성하였다. 이 중간체를 사슬 중에 도입한 폴리우레탄 예비중합체의 말단에 펜타에리트리톨트리아크릴레이트를 반응시켜 별도의 광개시제 없이 자외선 조사로 자가 경화되는 폴리(우레탄 아크릴레이트)(PUA) 올리고머를 합성하였다. 자외선에 의해 경화된 PUA는 한 개의 유리전이 온도를 갖는단일상 거동을 보였다. 이 유리전이 온도와 고무상 모듈러스 값은 폴리우레탄 이론적 예비중합체의 분자량이 적을수록 증가하였고, 경화된 PUA의 가교 밀도가 증가할수록 증가하였다. 특히, 폴리우레탄 예비중합체의 분자량이5000 혹은 10000인 경우, 경화된 PUA는 높은 인장강도와 파단신율을 동시에 갖는 강인성을 발현하였다. 또한 경화된 PUA는 투명하면서 내황변성이 우수하였으며, 가교밀도가 증가함에 따라 표면 광택과 경도, 그리고 내용제성이 향상되었다.

Keywords: poly(urethane acrylate); UV-curable; mechanical properties; physical properties

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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

  • 2017; 41(5): 790-797

    Published online Sep 25, 2017

  • 10.7317/pk.2017.41.5.790
  • Received on Feb 20, 2017
  • Accepted on May 7, 2017