Curing Behaviours and Adhesion Performance of Thermal Cured Acrylic PSAs Synthesized by UV-polymerization
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초록
Many methods for cross-linking acrylic PSAs have been discussed previously. For high cross-linking density, epoxy functionalized monomer and methyl aziridines as cross-linking agents were used in this study. Additionally, photopolymerization using different UV doses was investigated to synthesize a binder because of its rapid productivity. FT-IR analysis, curing behaviours and adhesion performance were examined for the relationship between UV doses and temperature as curing conditions. According to the results, the gel fraction was over 50% even at 120°C after UV curing at a dose of 800 mJ/cm2. On the other hand, while gel fractions of all samples reached approximately 80% only at 180°C in thermal curing for 1 hour, gel fractions of the samples after thermal curing for 3 hours increased rapidly above 120°C regardless of UV doses and reached approximately 100% at 180°C. This means that the second cross-linking reaction, esterification, is mainly dependent on the curing temperature.
Abstract
Many methods for cross-linking acrylic PSAs have been discussed previously. For high cross-linking density, epoxy functionalized monomer and methyl aziridines as cross-linking agents were used in this study. Additionally, photopolymerization using different UV doses was investigated to synthesize a binder because of its rapid productivity. FT-IR analysis, curing behaviours and adhesion performance were examined for the relationship between UV doses and temperature as curing conditions. According to the results, the gel fraction was over 50% even at 120°C after UV curing at a dose of 800 mJ/cm2. On the other hand, while gel fractions of all samples reached approximately 80% only at 180°C in thermal curing for 1 hour, gel fractions of the samples after thermal curing for 3 hours increased rapidly above 120°C regardless of UV doses and reached approximately 100% at 180°C. This means that the second cross-linking reaction, esterification, is mainly dependent on the curing temperature.
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