As three-dimensional (3D) printing technology is emerging as an alternative way of manufacturing, the high resolution 3D printing device often requires systems such as drop jetting printing of in situ UV-curable photopolymers. Accordingly, the key issue is process control and its optimization to ensure dimensional accuracy, surface roughness, building orientation, and mechanical properties of printed structures, which are based on the time- and temperature-dependent glass transition temperature (Tg) of the resin system under UV-curing. In this study, the UV-cure kinetics and Tg development of a commercially available UV-curable acrylic resin system were investigated as a model system, using a differential scanning photocalorimeter (DPC). The developed kinetic model included the limited conversion of cure that could be achieved as a maximum at a specific isothermal curing temperature. Using the developed model, the Tg was successfully described by a modified DiBenedetto equation as a function of UV curing. The developed kinetic model and Tg development can be used to determine the 3D printing operating conditions for the overlay printing and in situ UV curing, which could ensure high-resolution and high-speed manufacturing with various UV-curing materials.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF), the Ministry of Science, ICT & Future Planning (NRF-2014M3C1B2048175 and 2016R1A2B1007134), and the Ministry of Trade, Industry and Energy (MOTIE) (10067690). We also appreciate the project and equipment support from Gyeonggi Province through the GRRC program of Sungkyunkwan University. KJK would like to acknowledge that this material is based upon work supported in part by the National Science Foundation, under Grant No. IIA-1301726.
- Differential scanning photocalorimetry
- Glass transition temperature
- Multi-jet 3D printing
- Performance development
- UV-curable polymer
- UV-cure kinetics
ASJC Scopus subject areas
- General Physics and Astronomy
- Polymers and Plastics
- Organic Chemistry
- Materials Chemistry