Preprint Article Version 1 This version is not peer-reviewed

Bioinspired Temperature Responsive Multilayer Films and Their Performance under Thermal Fatigue

Version 1 : Received: 13 June 2018 / Approved: 14 June 2018 / Online: 14 June 2018 (09:01:53 CEST)

How to cite: Athanasopoulos, N.; Siakavellas, N.J. Bioinspired Temperature Responsive Multilayer Films and Their Performance under Thermal Fatigue. Preprints 2018, 2018060227 (doi: 10.20944/preprints201806.0227.v1). Athanasopoulos, N.; Siakavellas, N.J. Bioinspired Temperature Responsive Multilayer Films and Their Performance under Thermal Fatigue. Preprints 2018, 2018060227 (doi: 10.20944/preprints201806.0227.v1).

Abstract

In Nature, it is common for living plants and non-living plant tissues to consist of materials with anisotropic multilayer and non-homogenous structure. The structure of tissues determines their self-shaping and self-folding capabilities in response to a stimulus in order to activate different functionalities. Predetermined movements are realized according to changes in environmental conditions, which trigger the fibrous anisotropic structure of the plants’ material. In this study, we present the fabrication process of low-cost anisotropic multilayer materials that are capable of realizing complex movements caused by small temperature changes (<40 oC). The mismatch in the thermo-mechanical properties between three or more anisotropic thin layers creates responsive materials that alter their shape owing to the developed internal stresses. Isotropic layers can perform only bending movements, whereas anisotropic multilayer materials can perform bending, twisting or complex combined modes. The movements of the material can be controlled by forming anisotropic homogenous metallic strips over an anisotropic polymer. As a result, inexpensive responsive materials can be developed to passively react to a very broad range of thermal requirements. We studied the major parameters that affect the sensitivity of the developed materials, as well as their failure modes and crack formation under thermal fatigue conditions.

Subject Areas

responsive materials; smart materials; bioinspired materials; non-living plant tissues; anisotropy; thermal fatigue; microstructure; 4D printing; additive manufacturing

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