Journal
PROGRESS IN ORGANIC COATINGS
Volume 162, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2021.106567
Keywords
Flexible protective coating; Sol-gel siloxane hybrid; Polyurethane-siloxane composite; Transparent coating; Micro; nanomechanical analyses
Funding
- Wearable Platform Materials Technology Center (WMC) - National Research Foundation of Korea (NRF) - Korean Government (MSIP) [NRF-2016R1A5A1009926, NRF-2021M3D1A2049869]
- Police-Lab 2.0 program - Ministry of Science and ICT (MSIT)
- Korean National Police Agency (KNPA) [210121M02]
- Ministry of Science & ICT (MSIT), Republic of Korea [210121M02] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A promising protective coating was proposed in this study, which integrates polyurethane acrylate and organic-inorganic siloxane hybrid to achieve excellent optical and mechanical properties, as well as outstanding reliability for flexible electronics. The urethane-methacrylate siloxane hybrid (U-MSH) composite demonstrated great potential as a protective material for flexible electronics, showing remarkable performance in various tests.
Although foldable electronic devices have been commercially available for some time now, flexible protective coating with sufficient reliability is yet to be achieved. The integration of polyurethane acrylate and an organicinorganic (O-I) siloxane hybrid is proposed in this study as a promising protective coating, where both high strength and stretchability could be achieved to allow for the needed reliability for foldable electronics. In this work, a urethane-methacrylate siloxane hybrid (U-MSH) composite was fabricated by a physical blending of methacrylate-functionalized oligosiloxane and acrylate terminated urethane prepolymer followed by curing. The U-MSH composite demonstrates excellent performance in terms of optical (e.g., transmittance, Abbe number, UV stability) and mechanical properties (e.g., resilience under compression, tension, and scratch). These outstanding properties can be attributed to the synergetic effect of the combined polyurethane acrylate and O-I siloxane hybrid. Excellent reliability of U-MSH coating film is successfully demonstrated using an outward-bending test, suggesting that U-MSH has great potential as a protective material for flexible electronics.
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