Reconfigurable Polymer Networks for Digital Light Processing 3D Printing

Abstract

To realize a wide range of applications using three-dimensional (3D) printing, it is urgent to develop 3D printing resins with different functions. However, the design freedom of the resin formulation is greatly limited to guarantee fast gelation during 3D printing. Herein, we report a reconfigurable polymer network that is compatible with digital light processing (DLP) 3D printing. The properties of the printed objects can be remanipulated by postthermal treatment, during which the polymer network undergoes significant changes through the amidation of ester. The Young's modulus could be significantly reduced by 50 times. Specifically, a well-printed rigid part can be completely turned into a low-viscosity liquid. This strategy decouples the printing process and the final material properties, providing an efficient approach to print various functional objects.

Achievement of a Highly Rapid Bond Exchange for Self-Catalyzed Polyester Vitrimers by Incorporating Tertiary Amino Groups on the Network Strands

“…Therefore, the observed creep can be attributed to the bond exchange via a trans-esterification. Since, according to the literature, 24,25 the bond exchange does not occur between OH and amide groups, the bond exchange simply operates between OH groups and ester bonds. In the stress relaxation tests, a great relaxation was observed above the T act , as shown in Figure 2b.…”

4D Printing of a Fully Biobased Shape Memory Copolyester via a UV-Assisted FDM Strategy

“…Not surprisingly, many 4D-printed SMPs have been developed by using different printing technologies, such as fused deposition modeling (FDM), − digital light printing (DLP), − selective laser sintering, , and direct ink writing. , Among these, FDM is one of the most commonly used techniques to fabricate thermoplastic polymers because of its low cost and easy operations. , Leng et al printed porous bone tissue scaffolds based on PLA/Fe 3 O 4 composites by FDM, which exhibited a good mechanical stability and magnetic-field induced SME . Shi et al put forward a FDM printing bioinspired microstructure strategy to create gradient microgap structures in PLA/nanocarbon black composites and further designed a macroscopic integrated sensor–actuator with the capacity of actuation and sensation .…”

Smart Diffraction Gratings Based on the Shape Memory Effect

“…Since SMPs are of a wide variety of types, the technologies available for preparing SMPs include direct ink writing, Polyjet, fused deposition modeling, digital light process, stereolithography, and two-photon polymerization. [4,[17][18][19][20][21] Light is a powerful weapon, whether it is in the analysis of material properties or material processing, [22][23][24][25] especially high-performance lasers have unparalleled applications in the field of additive and subtractive material manufacturing. [26][27][28][29][30] Recently, Wang et al have used 4D printing to produce multicolored lattice structures with submicron feature sizes using femtosecond laser two-photon polymerization (Fs-TPP), where the structures can switch colors consistently and rapidly.…”

“…Since SMPs are of a wide variety of types, the technologies available for preparing SMPs include direct ink writing, Polyjet, fused deposition modeling, digital light process, stereolithography, and two‐photon polymerization. [ 4,17–21 ] Light is a powerful weapon, whether it is in the analysis of material properties or material processing, [ 22–25 ] especially high‐performance lasers have unparalleled applications in the field of additive and subtractive material manufacturing. [ 26–30 ] Recently, Wang et al.…”