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13 March 2024 Development of a liquid crystalline pressure-sensitive adhesive
Shohei Saito
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Proceedings Volume PC12907, Emerging Liquid Crystal Technologies XIX; PC1290704 (2024) https://doi.org/10.1117/12.3002001
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
While hydrogen bonds are often used for the construction of supramolecular structures, the hygroscopic nature often decreases the adhesive strength. We have previously developed a light-melt adhesive with strong non-hydrogen-bonding cohesive force due to a two-fold π-stacking structure of V-shaped flapping molecules (FLAP). Here we have developed a new FLAP molecule, dppz-FLAP, bearing an electron-deficient dipyridophenazine (dppz) wings that enhances the cohesive force of the supramolecular materials by constructing tighter two-fold columnar π-stacking structure. This material shows viscoelasticity and liquid-crystalline properties by introducing peripheral long alkyl chains. Actually, dppz-FLAP demonstrates high shear strength over 1 MPa as a supramolecular adhesive. Since the dppz-FLAP adhesive only needs to be pressed at room temperature for the adhesion process, it could be categorized into a pressure sensitive adhesive (PSA). Interestingly, the dppz-FLAP film pasted on a PET tape showed virtually no peeling stress. Therefore, dppz-FLAP is the first liquid-crystalline pressure sensitive adhesive (PSA) that shows high shear strength with easy peelability.
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© (2024) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Shohei Saito "Development of a liquid crystalline pressure-sensitive adhesive", Proc. SPIE PC12907, Emerging Liquid Crystal Technologies XIX, PC1290704 (13 March 2024); https://doi.org/10.1117/12.3002001
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KEYWORDS
Adhesives
Crystals
Liquid crystals
Liquids
Molecules
Coating stress
Hydrogen
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