Preparation of photosensitive resin based on poly (trimethylene ether glycol) for 3D printing

In recently years, polyol prepared from biobased renewable resources has attracted researchers' attention to synthesize green environmental polyurethane. Among numerous polyols, poly (trimethylene ether glycol) (PO3G) is used to prepare polyurethane due to outstanding performances. This paper aims to prepare photosensitive polyurethane acrylate based on 100% renewable PO3G with low viscosity, great flexibility and fast curing speed. The physical and thermal properties of materials were characterized by FTIR, ATR, DSC and DMA. The mechanical properties were measured emphatically. All the results suggest the prepared PO3G-based resins exhibit excellent strength and flexibility with low viscosity. On the other hand, the blocking agent with dynamic covalent bond was introduced to ensure the low viscosity of resins under UV curing. With the break of blocking agent, the isocyanate group could be fully released and carry out chain extension with amine during secondary curing to form polyurethane network and comprehensive performance of resins. Furthermore, the prepared materials have significant advantage and show good application potential in UV-curing 3D printing.