4D printing of shape memory aliphatic copolyester via UV-assisted FDM strategy for medical protective devices

Cheng, Chuan-Ying; Xie, Hui; Xu, Zhi-Yuan; Li, Lü; Jiang, Mengjin; Tang, Li; Yang, Ke‐Ke; Wang, Yu‐Zhong

doi:10.1016/j.cej.2020.125242

Cited by 99 publications

(34 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…FDM is a material extrusion-based technology that heats and extrudes a polymer filament through a nozzle to create a 3D object layer by layer. This technology has been extensively investigated for the fabrication of 3D printed medicines and medical devices on Earth ( Cheng et al, 2020 ; Goyanes et al, 2014 ). Previous experience in 3DP aboard the ISS have shown that microgravity has no significant effects on the process, paving the way for the use of 3DP in future long-term missions ( Prater et al, 2019 ).…”

Section: Innovative Manufacturing Methods For Medicinesmentioning

confidence: 99%

To infinity and beyond: Strategies for fabricating medicines in outer space

Seoane-Viaño¹,

Ong²,

Basit³

et al. 2022

International Journal of Pharmaceutics: X

View full text Add to dashboard Cite

Section: Innovative Manufacturing Methods For Medicinesmentioning

confidence: 99%

To infinity and beyond: Strategies for fabricating medicines in outer space

Seoane-Viaño¹,

Ong²,

Basit³

et al. 2022

International Journal of Pharmaceutics: X

View full text Add to dashboard Cite

“…If a photo-initiator (e.g., bimethoxy-2-phenylacetophenone, DMPA) is added, under 365 nm UV light, UPy-HTPB-UPy can be cross-linked. The amount of DMPA and UV exposure time can be controlled to tailor the density of cross-linking [ 18 ]. Consequently, there are two types of cross-linking in the resulted polymers; one is permanent due to photo cross-linking and the other is dynamic as the result of the quadrupolar hydrogen-bonding interaction.…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature Solid-State UV Cross-Linkable Vitrimer-like Polymers for Additive Manufacturing

Chen

Zeng

et al. 2022

Polymers

View full text Add to dashboard Cite

In this paper, a UV cross-linkable vitrimer-like polymer, ureidopyrimidinone functionalized telechelic polybutadiene, is reported. It is synthesized in two steps. First, 2(6-isocyanatohexylaminocarbonylamino)-6-methyl-4[1H]-pyrimidinone (UPy-NCO) reacts with hydroxy-functionalized polybutadiene (HTPB) to obtain UPy-HTPB-UPy, and then the resulted UPy-HTPB-UPy is cross-linked under 365 nm UV light (photo-initiator: bimethoxy-2-phenylacetophenone, DMPA). Further investigation reveals that the density of cross-linking and mechanical properties of the resulting polymers can be tailored via varying the amount of photo-initiator and UV exposure time. Before UV cross-linking, UPy-HTPB-UPy is found to be vitrimer-like due to the quadruple hydrogen-bonding interactions. The UPy groups at the end of the chain also enable for rapid solidification upon the evaporation of the solvent. The unsaturated double bonds in the HTPB chains enable UPy-HTPB-UPy to be UV cross-linkable in the solid state at room temperature. After cross-linking, the polymers have good shape memory effect (SME). Here, we demonstrate that this type of polymer can have many potential applications in additive manufacturing. In the cases of fused deposition modelling (FDM) and direct ink writing (DIW), not only the strength of the interlayer bonding but also the strength of the polymer itself can be enhanced via UV exposure (from thermoplastic to thermoset) either during printing or after printing. The SME after cross-linking further helps to achieve rapid volumetric additive manufacturing anytime and anywhere.

show abstract

“…38 Shape memory materials are the materials with the ability to change shape over time when exposed to different external stimuli which is called 4D printing. 39,40 These waterborne biodegradable polyurethane shape memory elastomers were prepared with 38 wt % poly(e-caprolactone) (PCL) and 25 wt % poly(L-lactic acid) (PLLA) segments and synthesized at a relatively lower temperature by waterborne procedure. AR Rajkumar et al 41 studied the process parameters of 3D printed thermoplastics effect on shape memory.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of energy absorption capabilities and mechanical properties in FDM printed PLA TPMS structures

Sankineni

Kumar

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

Additive manufacturing is an advanced technology used to fabricate complex geometries with unique properties like cellular structures which accommodate repeated unit cells located in the x, y and z direction. These structures can be used as infill patterns due to their self-supporting structure. Among the cellular structures, Triply Periodic Minimal Surface (TPMS) structures such as Gyroid, Diamond and Schwarz Primitive (SchwarzP) structures can be tailored to produce complex structures for various applications like tissue engineering scaffolds and replace the conventional polymeric foams. TPMS structures are designed and manufactured by using the Fused Deposition Modelling (FDM) technique using Poly-Lactic Acid (PLA) as material. Among TPMS structures, Gyroid is having a unique property like structurally symmetric which design was modified to enhance the mechanical properties. The modified Gyroid or deformed Gyroid undergone a quasi-static compression test and compare the results with Diamond and SchwarzP structures. Porosity and permeability coefficients are evaluated and an optical microscope is used to verify the fabricated components. As well as, Failure patterns of the structures were evaluated and energy absorption capabilities determined. The main objective of this paper is to evaluate the impact of design and porosity on the mechanical and morphological properties of TPMS structures. In conclusion, the deformed Gyroid has more energy absorption capability up to the 11.6% strain than other TPMS structures. After 11.6% of strain, SchwarzP structure dominates.

show abstract

4D printing of shape memory aliphatic copolyester via UV-assisted FDM strategy for medical protective devices

Cited by 99 publications

References 42 publications

To infinity and beyond: Strategies for fabricating medicines in outer space

To infinity and beyond: Strategies for fabricating medicines in outer space

Room-Temperature Solid-State UV Cross-Linkable Vitrimer-like Polymers for Additive Manufacturing

Evaluation of energy absorption capabilities and mechanical properties in FDM printed PLA TPMS structures

Contact Info

Product

Resources

About