Photopolymerization-based 4D-Printing of Shape-Memory Materials Containing High-Performance Polymers
REACTIVE & FUNCTIONAL POLYMERS（2024）
Russian Acad Sci
Abstract
High-performance aromatic heterochain polymers are engineering thermoplastics with exceptional mechanical and thermal properties that have attracted great interest in various areas ranging from aerospace to biomedicine. However, there have been a number of difficulties to 3D-print materials based on such polymers with new promising performance characteristics. Herein, a number of new photosensitive compositions (PSCs) based on high-performance polyetherimide (PEI) or polysulfone (PSU), reactive functional monomer (N,N-dimethylacrylamide) and oligomer (bisphenol A ethoxylate diacrylate) has been developed. It has been shown that the use of the developed PSCs allows the formation of 3D-structures with high printing resolution by LCD 3D-printing. Subsequent thermal post-curing of 3D-printed green-state samples at 250 degrees & Scy; for 1 h led to the fabrication of materials with the highest tensile strength (up to 41.9 +/- 3.1 MPa), glass transition temperature (141 degrees C) and thermal stability (above 350 degrees C). In addition, 3D-printed structures demonstrate high-temperature shape memory effect with shape fixity ratio > 99% and shape recovery ratio up to 97.1%.
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Key words
Photopolymerization,LCD 3D/4D-printing,Shape memory polymers,Polyetherimide,Polysulfone
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