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Frontally polymerizable shape memory polymer for 3D printing of free-standing structures

Cited 4 time in Web of Science Cited 6 time in Scopus
Authors

An, Yongsan; Jang, Joon Hyeok; Youk, Ji Ho; Yu, Woong-Ryeol

Issue Date
2022-02-01
Publisher
Institute of Physics Publishing
Citation
Smart Materials and Structures, Vol.31 No.2, p. 025013
Abstract
Four-dimensional (4D) printing is used to describe three-dimensional (3D)-printed objects with properties that change over time. Shape memory polymers (SMPs) are representative materials for 4D printing technologies. The ability to print geometrically complex, free-standing forms with SMPs is crucial for successful 4D printing. In this study, an SMP capable of frontal polymerization featuring exothermic self-propagation was synthesized by adding cyclooctene to a poly(dicyclopentadiene) network, resulting in switching segments. The rheological properties of this SMP were controlled by adjusting incubation time. A nozzle system was designed such that the SMP could be printed with simultaneous polymerization to yield a free-standing structure. The printing speed was set to 3 cm min(-1) according to the frontal polymerization speed. A free-standing, hexagonal spiral was successfully printed and printed spiral structure showed excellent shape memory performance with a fixity ratio of about 98% and a recovery ratio of 100%, thereby demonstrating the 3D printability and shape memory performance of frontally polymerizable SMPs.
ISSN
0964-1726
URI
https://hdl.handle.net/10371/179454
DOI
https://doi.org/10.1088/1361-665X/ac41ea
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Materials Science and Engineering (재료공학부)Journal Papers (저널논문_재료공학부)
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