Study on the Adhesion Improvement of UV Curing Polyurethane Alignment and Substrate for Flexible Display

• Main Authors: Ping-Yu Lin, 林秉宥
• Other Authors: Chi-Yuan Huang
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/00785265828486361936

碩士 === 大同大學 === 材料工程學系(所) === 101 === In this study, the nano-imprinting and UV curing technology were used to produce the spacer of flexible display, and to improve the methods of spacer production. The main that purpose was improving the plastics substrate manufacture and impact its stress resistance in order to maintain the value of spacer gap, which can keep original optical property and durability, and improving the mechanical property. The focus of this study was on the re-planning the process of the flexible display, so that the process would much more match the roll-to-roll(R2R) process. In the investigation, effects of surface modification by argon plasma on shear strength of flexible device processed on ITO coated PET substrate (PET / ITO flake) were studied. Use to single lap shear specimens were tested according to ASTM D3165-00. This test was used to determine comparative shear strengths by various surface plasma treatment preparation. After plasma treated, the free radicals were generated on PET / ITO flake surfaces and then converted to peroxide offer exposed to air. The concentration of peroxides were estimated by the 1,1-dipphenyl-2-picrylhydrazyl (DPPH∙) method. The surface morphology and the wettability of PET / ITO flake were analyzed by atomic force microscopy (AFM) and static contact angle measurement, respectively. Identify the functional groups of the adhesive and their relative change was proved by Micro FTIR. From the results, the optimum free radical content for offering high shear strength was 0.31×10-9 mol/mm2 at 20 W plasma-treated for 3 min. The plasma treated PET / ITO substrate surfaces possessed the hydrophilic property and introduced the number of anchors. AFM photographs shows that the surface of possessed many microporous. This microporous shear mechanism can offer shear strength as shear testing. As Surface modification by plasma treatment, the shear strength of PET / ITO flake with adhesive UV curing polyurethane(UV-PU) was increased from 0.72 to 0.98 MPa, respectively. Influences of UV-photoinitiator content, spin-coating speed, molding pressure, and acetone dilution content on the micro-structured spacer of flexible panel were studied. Results showed that UV-photoinitiator content of 3.0 wt% in spacer material got the optimum UV-curing condition, also found precoating a PU layer can improve coating colloids surface smoothness. Through precoating a PU layer can reduce surface roughness PET / ITO flake by argon plasma treatment. Reduce the light scattering while achieving increased transmittance.