A groundbreaking advancement in 3D printing has emerged from the University of Texas at Austin, where researchers have developed a novel light-activated resin that can transition between hard and soft states within a single object. The substance, created by Assistant Professor Zak Page and his team, aims to overcome a common failure point in materials composed of both hard and soft elements, which often break at the interface where the two meet.<\/p>\n
Inspired by the natural transition found in materials like bone and cartilage, the resin combines an epoxy\u2013acrylate monomer with a photosensitizer compound. This material is used in digital light processing (DLP) 3D printing, where focused light patterns polymerize the resin into solid layers. When exposed to violet light, the resin turns into a stretchy, rubber-like material, while exposure to ultraviolet light results in a hard, rigid form. This innovative approach allows for a gradual blend of the two states, effectively creating a seamless transition from soft to hard.<\/p>\n
The technology has been demonstrated in various applications, including 3D-printed shock absorbers with hard springs inside a soft cylinder, stretchable electronics that protect delicate components, and a model simulating a knee joint with both rigid bones and flexible ligaments. Potential future applications are vast, ranging from surgical training models to wearable sensors and soft-bodied robots.<\/p>\n
This advancement follows similar materials research by teams at Case Western Reserve University and the University of California Santa Barbara, which developed resins that can alter their hardness based on light exposure.<\/p>\n