Programmable 4D Printing of Bioinspired Solvent‐Driven Morphing Composites. Issue 8 (19th June 2021)

• Record Type: Journal Article
• Authors: Ren, Luquan; Li, Zhuoshi; Liu, Qingping; Ren, Lei; Wu, Qian; Li, Bingqian; Li, Guiwei; Song, Zhengyi; Zhou, Xueli
• Is Part Of: Advanced materials technologies. Volume 6:Issue 8(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-06-19
• Subjects: 4D printing -- bioinspired composites -- efficient 3D printing -- gradient crosslinking -- site‐specific oriented fibers; Materials science -- Periodicals; Technological innovations -- Periodicals; Materials science; Technological innovations; Periodicals; 620.1105
• DOI: 10.1002/admt.202001289
• Languages: English
• ISSNs: 2365-709X

Abstract

Abstract: In this article, we propose a bioinspired programmed 4D printing method. A combination of magnetic orientation process and grayscale 3D printing is used to achieve site‐specific orientation of the reinforcing fibers and gradient crosslinking of the matrix resin in the thickness direction within 2D composite films. After solventization and desolventization, 2D thin film structures can be transformed into complex 3D architectures, and the transformed 3D architectures can be permanently preserved without stimulation sources. Thus, the method can also be considered as an efficient 3D printing process. Then, the influences of crosslinking density, sample geometry, formulation, and fiber architecture on the deformation of the printed objects are investigated. Finally, as a proof of concept, various samples, including a hand, snowflake, and leaf, are printed to verify the feasibility of the proposed 4D printing strategy. This programmed 4D printing method provides a simple and effective reversible strategy, taking the full advantages of 4D printing and expanding the design space of 4D printing. Abstract : In this paper, a 3D magnetic printing process is used to achieve site‐specific fiber orientation inside the composite. Combined with the gradient cross‐linking of the matrix material in the thickness direction during the curing process, it allows 2D films to produce predetermined permanent 3D shape changes after solvent treatment. It breaks the shackles of traditional 3D printing layer‐by‐layer manufacturing.