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Fully Transparent and Distortion-Free Monotonically Stretchable Substrate by Nanostructure Alignment.

Jung Hur^1,2, Hwaeun Park^3,4, Hyeongsu Oh^1,2

¹Soft Hybrid Materials Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)

|December 13, 2024

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Researchers developed distortion-free stretchable substrates by aligning nanoscopic cylinders in elastomer films. This innovation minimizes vertical contraction, enabling clear, comfortable stretchable electronics and displays.

Area of Science:

Materials Science
Polymer Science
Nanotechnology

Background:

Stretchable devices face challenges like vertical contraction during stretching, leading to image distortion and discomfort.
Existing solutions for vertical contraction, such as auxetic structures and wrinkles, become visible, compromising aesthetics and function.

Purpose of the Study:

To develop stretchable substrates that prevent vertical contraction and image distortion without visible structural changes.
To achieve monotonic stretchability with high transparency and minimal distortion for next-generation stretchable electronics.

Main Methods:

Unidirectional alignment of nanoscopic cylinders within block copolymer elastomer films using a high-temperature shear-rolling process.
Fabrication of thick films from polystyrene-block-polyisobutylene-block-polystyrene thermoplastic elastomers.

Keywords:

distortion‐free substrate stretchable devices stretchable display stretchable transparent substrate zero Poisson`s ratio

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Main Results:

Achieved macroscopic mechanical anisotropy with a modulus ratio exceeding five, minimizing vertical contraction to a Poisson's ratio below 0.07.
Created transparent, monotonically stretchable substrates with no visible distortions, surface undulations, or haziness during uniaxial stretching.
Demonstrated negligible impact of nanocylinders on visible light transmittance due to their sub-wavelength size.

Conclusions:

Unidirectionally aligned nanostructures offer a novel strategy to overcome vertical contraction in stretchable materials.
The developed substrates provide distortion-free performance, paving the way for advanced stretchable displays and wearable devices.
This approach enables high-performance stretchable electronics with improved comfort and visual fidelity.