US 12,005,633 B2
Method for photo-curing four-dimensional (4D) printing of multi-layer structure with adjustable shape recovery speed, and multi-layer structure prepared by photo-curing 4D printing
Shu Huang, Jiangsu (CN); Hang Zhang, Jiangsu (CN); Jianzhong Zhou, Jiangsu (CN); Jie Sheng, Jiangsu (CN); Jiean Wei, Jiangsu (CN); Hongwei Yang, Jiangsu (CN); Cheng Wang, Jiangsu (CN); and Mingyuan Shan, Jiangsu (CN)
Assigned to Jiangsu University, Jiangsu (CN)
Appl. No. 18/273,034
Filed by Jiangsu University, Jiangsu (CN)
PCT Filed Dec. 16, 2022, PCT No. PCT/CN2022/139478
§ 371(c)(1), (2) Date Jul. 19, 2023,
PCT Pub. No. WO2023/236490, PCT Pub. Date Dec. 14, 2023.
Claims priority of application No. 202210631018.6 (CN), filed on Jun. 6, 2022.
Prior Publication US 2024/0140023 A1, May 2, 2024
Int. Cl. B29C 64/129 (2017.01); B29K 75/00 (2006.01); B29K 507/04 (2006.01); B32B 7/027 (2019.01); B32B 27/08 (2006.01); B32B 27/20 (2006.01); B32B 27/40 (2006.01); B33Y 10/00 (2015.01); B33Y 80/00 (2015.01)
CPC B29C 64/129 (2017.08) [B32B 7/027 (2019.01); B32B 27/08 (2013.01); B32B 27/20 (2013.01); B32B 27/40 (2013.01); B33Y 10/00 (2014.12); B33Y 80/00 (2014.12); B29K 2075/00 (2013.01); B29K 2507/04 (2013.01); B32B 2264/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for photo-curing four-dimensional (4D) printing of a multi-layer structure with an adjustable shape recovery speed, comprising the following steps:
printing a slow layer, wherein an ultraviolet irradiation energy used during the printing of the slow layer is Islow, and a molecular chain cross-linking degree during the printing of the slow layer is Dslow;
printing a transition layer on the slow layer, wherein an ultraviolet irradiation energy used during the printing of the transition layer gradiently decreases in a thickness direction of the printing;
printing a fast layer on the transition layer, wherein an ultraviolet irradiation energy used during the printing of the fast layer is Ifast; a molecular chain cross-linking degree during the printing of the fast layer is Dfast; Islow>Ifast, and Dslow>Dfast; and the fast layer comprises a nanocarbon light-absorbing material to absorb ultraviolet light to reduce an exposure energy of incident light; and
printing the slow layer on the fast layer.