Issue 15, 2021

Quantitative analysis of bending hysteresis by real-time monitoring of curvature in flexible polymeric films

Abstract

Flexibility, viscoelasticity and stress–strain relation in bending polymeric films are key factors in designing mechanically durable flexible electronic devices and soft robots. However, bending hysteresis, which appears as a precursor phenomenon of fracture and fatigue, remains unclear; no one quantitatively evaluated a bending curvature causing hysteresis. Herein, we report the bending hysteresis of polymeric films used as common substrates in flexible electronics by precisely monitoring bending curvatures. By real-time measuring curvatures of films upon bending and subsequent unbending, we have successfully determined the curvatures that cause the hysteresis. These curvatures also depend on a film thickness. Furthermore, we revealed that the occurrence of bending hysteresis is explained by bending strains that have a nonlinear relation with internal stresses. This enables us to predict strain limits that cause the bending hysteresis, based on a stress–strain curve of polymeric films.

Graphical abstract: Quantitative analysis of bending hysteresis by real-time monitoring of curvature in flexible polymeric films

Supplementary files

Article information

Article type
Paper
Submitted
18 Dec 2020
Accepted
19 Mar 2021
First published
07 Apr 2021

Soft Matter, 2021,17, 4040-4046

Quantitative analysis of bending hysteresis by real-time monitoring of curvature in flexible polymeric films

R. Taguchi, K. Kuwahara, N. Akamatsu and A. Shishido, Soft Matter, 2021, 17, 4040 DOI: 10.1039/D0SM02233K

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements