Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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The Effect of Crosslinker Type on Adhesion Properties of Transparent Acrylic Pressure Sensitive Adhesives for Optical Applications

가교제 변화에 따른 광학용 아크릴 점착제의 점착물성에 대한 연구

  • Baek, Seung-Suk (Department of Polymer Science & Engineering, Center for Photofunctional Energy Materials, Dankook University) ;
  • Jang, Se-Jung (Department of Polymer Science & Engineering, Center for Photofunctional Energy Materials, Dankook University) ;
  • Hwang, Seok-Ho (Department of Polymer Science & Engineering, Center for Photofunctional Energy Materials, Dankook University)
  • 백승석 (단국대학교 고분자공학과, 광에너지소재연구센터) ;
  • 장세정 (단국대학교 고분자공학과, 광에너지소재연구센터) ;
  • 황석호 (단국대학교 고분자공학과, 광에너지소재연구센터)
  • Received : 2014.06.30
  • Accepted : 2014.07.16
  • Published : 2014.09.30
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Abstract

Terpolymer syrups were photopolymerized from 2-ethylhexyl acrylate, 2-hydroxylethyl acrylate and isobornyl acrylate to prepare acrylic pressure sensitive adhesives (PSAs). After polymerization, various crosslinkers as 1,6-hexanediol diacrylate (HDDA), poly (ethylene glycol) diacrylate (PEGDA, Mn = 250, 575, and 700) were added and then UV-irradiated to prepare the semi-IPN type PSAs. Their adhesion performance and storage modulus (G') were strongly dependent on their chemical structure and molecular weight of the crosslinkers. Optical properties such as transmittance (> 92.5 %), haze (< 1.0 %) and color-difference (< 0.3) of PSAs samples were not affected by crosslinker types used in this study.

아크릴 단량체인 2-ethylhexyl acrylate (2-EHA), 2-hydroxyethyl acrylate (2-HEA), isobornyl acrylate (IBOA)를 광중합을 통하여 3원 공중합체 시럽을 합성하였다. 이관능기 아크릴 단량체인 1,6-hexanediol diacrylate (HDDA), poly(ethylene glycol) diacrylate (PEGDA, Mn = 250, 575, 700)를 가교제로 사용하여 semi-IPN형 감압성 점착제 (Pressure sensitive adhesives; PSAs)를 UV-광가교 시켜 제조하였다. 가교제 변화에 따른 감압성 점착제의 점착특성, 저장탄성율, 그리고 광학특성을 고찰하였으며, 점착특성과 저장탄성율은 가교제의 화학구조와 분자량에 의존하였다. 광학특성은 모든 감압성 점착제에서 92.5 % 이상의 광투과도 (at 550 nm), 1.0 % 이하의 haze값, 0.3 이하의 색차계값을 보임을 확인하였다. 결과적으로 가교제의 종류에 영향을 받지 않음을 확인하였다.

Keywords

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