| 초록 |
We studied the structure-mechanical property relationship to demonstrate the highly tunable mechanical properties of printed porous PDMS via direct ink writing. To enable 3D printing, we develop a porous PDMS ink consisting of a PDMS precursor, silicone oil, dibutyl phthalate (DBP), and fumed silica nanoparticles by tuning the rheological behaviors. The rheological impact of each component was characterized by viscosity, storage modulus and loss modulus measurements. The porous structures in PDMS are subsequently generated by the removal of DBP in the cured PDMS matrix and characterized by scanning electron microscopy. Mechanical characterization exhibits that the printed sample using the porous PDMS precursor has enhanced stiffness, strength, toughness, and ductility compared to the nonporous PDMS sample. Notably, a broad range of mechanical properties is achieved by varying structural parameters (i.e., infill densities and printing patterns) for 3D printing of a single porous PDMS material system, which provides insight for designing adaptive soft robots and actuators that can integrate different mechanical properties into a single device by simply changing the structural parameters. |
