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Department of Polymer Science & Engineering, Center for Photofunctional Energy Materials, Dankook University, Yongin, Gyeonggi 448-701, Korea(Received June 30, 2014, Revised July 14, 2014, Accepted July 16, 2014)   2-ethylhexyl acrylate (2-EHA), 2-hydroxyethyl acrylate (2-HEA), isobornyl acrylate (IBOA)   3   .    1,6-hexanediol diacrylate (HDDA), poly(ethylene glycol) diacrylate (PEGDA, Mn = 250, 575, 700)   semi-IPN   (Pressure sensitive adhesives; PSAs) UV-  .      , ,   ,      .     92.5 %   (at 550 nm), 1.0 %  haze, 0.3    .       .ABSTRACTTerpolymer 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.Keywordspressure sensitive adhesives, crosslinker, semi-IPN, UV-curing, peel strength, transmittance

The Effect of Crosslinker Type on Adhesion Properties of Transparent Acrylic Pressure Sensitive Adhesives for Optical Applications