69‐3: Non‐Linear Mechanics of Adhesives for Robust Flexible Displays

The critical properties of robust adhesives for flexible displays differ from typical measures of PSA (pressure‐sensitive adhesives) strength like peel adhesion. 3M™ Optically Clear Adhesives (OCAs) for foldable displays must repeatedly and reversibly strain to deformations of several hundred percen...

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Bibliographic Details
Published in:SID International Symposium Digest of technical papers 2021-05, Vol.52 (1), p.1036-1039
Main Authors: Abrahamson, Joel T., Yeh, Chyi-Huey Joshua, Hedegaard, Aaron T., McDaniel, David J.
Format: Article
Language:English
Subjects:
Adhesive strength
Adhesives
Cavitation
Decoupling
Displays
flexible displays
foldable displays
hyperelastic
OCA
Peel strength
PSA
Robustness
Shear modulus
Strain hardening
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Summary:The critical properties of robust adhesives for flexible displays differ from typical measures of PSA (pressure‐sensitive adhesives) strength like peel adhesion. 3M™ Optically Clear Adhesives (OCAs) for foldable displays must repeatedly and reversibly strain to deformations of several hundred percent. Typical shear modulus measurements with a rheometer give an incomplete picture of adhesive performance since they only strain the material a few percent. We present hyperelastic, that is, large‐strain measurements of exemplary 3M foldable OCAs which have important non‐linear stress responses, improving decoupling at the strain levels of a foldable display. Finally, non‐linear strain hardening in the polymers can help arrest the growth of cavitation bubbles (optical defects), in contrast to the strain hardening behavior needed to preserve fibrils for higher peel strength.
ISSN:0097-966X
2168-0159
DOI:10.1002/sdtp.14868