Hydrogel-polymer hybrids have been widely used for various applications such as biomedical devices and flexible electronics. However, the current technologies constrain the geometries of hydrogel-polymer hybrid to laminates consisting of hydrogel with silicone rubbers. This greatly limits functionality and performance of hydrogel-polymer–based devices and machines. Here, we report a simple yet versatile multimaterial 3D printing approach to fabricate complex hybrid 3D structures consisting of highly stretchable and high–water content acrylamide-PEGDA (AP) hydrogels covalently bonded with diverse UV curable polymers. The hybrid structures are printed on a self-built DLP-based multimaterial 3D printer. We realize covalent bonding between AP hydrogel and other polymers through incomplete polymerization of AP hydrogel initiated by the water-soluble photoinitiator TPO nanoparticles. We demonstrate a few applications taking advantage of this approach. The proposed approach paves a new way to realize multifunctional soft devices and machines by bonding hydrogel with other polymers in 3D forms.
Bibliographical noteFunding Information:
Q.G. acknowledges the Key-Area Research and Development Program of Guangdong Province (no. 2020B090923003). Z.C. and S.Q. acknowledge the National Natural Science Foundation of China (nos. 11525210 and 91748209) and the Fundamental Research Funds for the Central Universities (no. 2020XZZX005-02). B.Z. acknowledges the Fundamental Research Funds for the Central Universities (no. 31020190QD015) and the National Natural Science Foundation of China (no. 51903210). H.L. acknowledges the support provided by China Scholarship Council (CSC) for study at SUTD (CSC201806130090).
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