66‐2: Highly Transparent, Colorless Optical Film with Outstanding Mechanical Strength and Folding Reliability Using Mismatched Charge‐Transfer Complex Intensification
Sung Woo Hong, Sung Koo Lee, Seunghwan Bae, Youngwoong Kim
Abstract
This study describes a novel colorless polyimide window film using the concept of charge‐transfer complex (CTC) intensification. The resulting film has a tensile modulus of 8.4 GPa, total transmittance of ≈90%, and yellow index below 3. This is the best‐recorded balance between mechanical strength and optical properties for a highly flexible optical film. Additionally, the film exhibits a pencil hardness grade over 2H and folding reliability over 200,000 folding/unfolding cycles. These outstanding properties are attributed to the unique supramolecular structure, which features multiple hydrogen bonding and salt complexation interactions that lead to CTC intensification.
Topics & Concepts
Folding enduranceMaterials scienceUltimate tensile strengthFolding (DSP implementation)TransmittanceModulusComposite materialReliability (semiconductor)Supramolecular chemistryPolyimideOptoelectronicsLayer (electronics)CrystallographyStructural engineeringChemistryCrystal structurePolymerEthyl celluloseEngineeringQuantum mechanicsPower (physics)PhysicsSynthesis and properties of polymersSilicone and Siloxane ChemistryOrganic Electronics and Photovoltaics