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 |
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.
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