Characterization of Patterned Acrylic Pressure-Sensitive Adhesives using UV LED for Flexible Display Applications
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The acrylic PSA pre-polymer was synthesized using 2-EHA, IBA, AA, MMA, 2-HEA, and TMPTMP through bulk radical polymerization and PSA film was prepared with Irgacure 1173 and PEGDMA by UV LED curing. The UV LED curing was introduced for several advantages of selective wavelength, low thermal issue, controllable UV intensity, and accuracy of curing area. The gel fraction and FTIR conversion were calculated as functions of UV intensity level and irradiation time, showing the different tendency with UV metal halide curing. The shear strain was measured by lap shear strength test and the strain recovery was measured during stress relaxation after constant strain using DMA. The patterned PSA film was prepared using photomasks with several types of pattern widths by sorting out curing conditions. The strain recovery of patterned PSA film was also measured. Both UV LED cured PSA film and patterned PSA film show high strain recovery above 80 and 90%, respectively, with moderate elongation.