Light-oriented 3D printing of liquid crystal/photocurable resins and in-situ enhancement of mechanical performance

液晶/光固化树脂的光导向3D打印及机械性能的原位增强

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作者:Xiaolu Sun #, Shaoyun Chen #, Bo Qu, Rui Wang, Yanyu Zheng, Xiaoying Liu, Wenjie Li, Jianhong Gao, Qinhui Chen, Dongxian Zhuo

Abstract

Additive manufacturing technology has significantly impacted contemporary industries due to its ability to generate intricate computer-designed geometries. However, 3D-printed polymer parts often possess limited application potential, primarily because of their weak mechanical attributes. To overcome this drawback, this study formulates liquid crystal/photocurable resins suitable for the stereolithography technique by integrating 4'-pentyl-4-cyanobiphenyl with a photosensitive acrylic resin. This study demonstrates that stereolithography facilitates the precise modulation of the existing liquid crystal morphology within the resin. Furthermore, the orientation of the liquid crystal governs the oriented polymerization of monomers or prepolymers bearing acrylate groups. The products of this 3D printing approach manifest anisotropic behavior. Remarkably, when utilizing liquid crystal/photocurable resins, the resulting 3D-printed objects are approximately twice as robust as those created using commercial resins in terms of their tensile, flexural, and impact properties. This pioneering approach holds promise for realizing autonomously designed structures that remain elusive with present additive manufacturing techniques.

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