Mechanical and Thermal Properties of DCPDA-Modified THEICTA/DMAA Photocurable Resins for LCD 3D Printing

Conventional photocurable resins suffer from low mechanical strength and poor thermal stability, which restrict their broader application in photopolymerization-based 3D printing technologies. Strategies such as inorganic fillers or interpenetrating polymer networks (IPNs) improve performance but often lead to high viscosity or long post-curing times. In this work, a high-performance photocurable resin system based on tris(2-hydroxyethyl) isocyanurate triacrylate (THEICTA) and N, N-dimethylacrylamide (DMAA) was developed, achieving low viscosity and direct room-temperature 3D printability. Partial substitution of DMAA with Tricyclodecanedimethanol diacrylate (DCPDA) further enhanced its mechanical and thermal properties. The optimized resin exhibited a tensile strength of 80.9 MPa, a flexural strength of 166.1 MPa, a glass transition temperature of 176.2 °C, and a low viscosity of 78.7 mPa·s with shrinkage below 10%. The heat deflection temperatures reached 168.1 °C under 1.80 MPa and 187.3 °C under 0.45 MPa. This study provides an effective strategy for developing high-strength and heat-resistant photocurable resins suitable for efficient room-temperature 3D printing applications.