In recent years, the field of shape memory materials with active deformation capabilities has experienced rapid development. However, bismaleimide, as a widely used structural material in the aerospace industry, has been neglected in the field of shape memory. This work designed a UV-crosslinked network with 1-vinyl-2-pyrrolidone monomer, and prepared 4D printed smart structures based on shape memory bismaleimide resin through UVassisted DIW printing. 4D printed semi-interpenetrating network polymer materials were obtained through a two-stage UV-thermal curing process, resulted in an increase in the material 's glass transition temperature to a maximum of 187.4 degrees C. The storage modulus was improved to 5229 MPa. More important, we achieved a lowest shrinkage rate (0.21 %) of 4D printed polymer. The composite sandwich structure with electrical-driven shape memory performance was printed by double-sided printing of bismaleimide resin on conductive carbon fabric. 4D printed composite structure realizes in -situ self-blocking secondary curing, deformation process after curing. This significant progress provides a promising prospect for remote controllable and precise driving in the aerospace field.

CHEMICAL ENGINEERING JOURNAL  491 (2024)152196

Li, Yuejia; Zhang, Fenghua; Liu, Yanju; Leng, Jinsong

https://doi.org/10.1016/j.cej.2024.152196

4D printed shape memory bismaleimide resin with high storage modulus and low shrinkage rate via second-stage curing_.pdf