A <scp>3D</scp>‐Printable Acrylate‐Grafted Polycarbosilane Synthesized via Dehydrogenation Coupling Reaction

ABSTRACT The poor compatibility of liquid polycarbosilane with commercial photosensitive resins limits its application in 3D printing. To meet the practical requirement, the synthesis of photosensitive polycarbosilane capable of rapid photopolymerization has emerged as a new focus of research. In this work, a polycarbosilane with 2–10 mol% acrylate group from HEA was synthesized via a dehydrogenation coupling reaction between the Si–H of vinyl‐containing polycarbosilane and the –OH of 2‐hydroxyethyl acrylate, yielding over 90%. The acrylate‐grafted polycarbosilane shows low viscosity, high ceramic yield, and good storage stability, and its photocuring rate increases with the content of grafted‐acrylate. The 10 mol% acrylate‐grafted polycarbosilane named VA10 with a 1% photoinitiator can be rapidly photocured under 405 nm LED light and produce a cured green body with enough mechanical properties, suggesting its high potential for accurate 3D printing. Upon pyrolysis at 1000°C, the precursor green body printed using the digital light processing (DLP) technique produced a honeycomb ceramic component with a ceramic yield of 77.6% and a density of 0.42 g/cm 3 , which exhibited a specific compressive strength of 68.7 ± 4.9 MPa/(g·cm 3 ).