Auxetic elastomer composite with bi-axially near-zero Poisson’s ratio for free-from displays
발표자
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초록
내용
Stretchable displays have attracted attention as the next-generation free-from display technology. From an actual application perspective, transparent elastomeric polymers have been used as substrate materials. However, elastomeric materials have a Poisson's ratio of ~0.5 inherently, so undesirable image distortion occurs when stretched. Here, we propose a strain-engineered transparent elastomer composite as a substrate of stretchable displays. To control the Poisson's ratio of the stretchable substrate, a relatively rigid mechanical metamaterial frame was embedded into the elastomeric matrix material. As a result of quantitatively evaluating the tensile axis-dependent Poisson's ratio according to Young's modulus ratio of the frame and the matrix materials, when Young's modulus deviation was about 20 times, the Poisson's ratio was significantly reduced compared to that of the pristine elastomer substrates.