Investigation of shrinkage-induced stresses in stereolithography photo-curable resins

Karalekas, D.; Rapti, D.; Gdoutos, E. E.; Aggelopoulos, A.

doi:10.1007/bf02412150

Cited by 38 publications

(13 citation statements)

References 9 publications

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“…Prior to post-printing curing of MNs, the effect of curing conditions on the mechanical properties of the material was evaluated. It was hypothesised that the post-printing curing regime influences the cross-linking density, which has been documented to be closely associated with Young’s modulus and ultimate strength [ 28 , 29 ]. The aim of this study was to identify the curing settings that yield optimal material mechanical properties, thereby improving the mechanical behaviour of the MNs.…”

Section: Resultsmentioning

confidence: 99%

Optimisation of Design and Manufacturing Parameters of 3D Printed Solid Microneedles for Improved Strength, Sharpness, and Drug Delivery

et al. 2021

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3D printing has emerged as a powerful manufacturing technology and has attracted significant attention for the fabrication of microneedle (MN)-mediated transdermal systems. In this work, we describe an optimisation strategy for 3D-printed MNs, ranging from the design to the drug delivery stage. The key relationships between design and manufacturing parameters and quality and performance are systematically explored. The printing and post-printing set parameters were found to influence quality and material mechanical properties, respectively. It was demonstrated that the MN geometry affected piercing behaviour, fracture, and coating morphology. The delivery of insulin in porcine skin by inkjet-coated MNs was shown to be influenced by MN design.

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Section: Resultsmentioning

confidence: 99%

Optimisation of Design and Manufacturing Parameters of 3D Printed Solid Microneedles for Improved Strength, Sharpness, and Drug Delivery

et al. 2021

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“…Hybrid radical-cationic 3D-printed materials present reduced curing shrinkage and warping effects [9,48]. Residual stresses in epoxy-based SL printed parts are much lower than that of acrylate-based materials as investigated by Karalekas et al [15,49]. Thermal treatments to complete the reaction of unreacted epoxy monomers increase the level of residual stress, but it still remains considerably below that of acrylates.…”

Section: Simultaneous Dual-curing Systems Combining Two Polymerizatiomentioning

confidence: 98%

Enhancement of 3D-Printable Materials by Dual-Curing Procedures

et al. 2020

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Dual-curing thermosetting systems are recently being developed as an alternative to conventional curing systems due to their processing flexibility and the possibility of enhancing the properties of cured parts in single- or multi-stage processing scenarios. Most dual-curing systems currently employed in three-dimensional (3D) printing technologies are aimed at improving the quality and properties of the printed parts. However, further benefit can be obtained from control in the curing sequence, making it possible to obtain partially reacted 3D-printed parts with tailored structure and properties, and to complete the reaction by activation of a second polymerization reaction in a subsequent processing stage. This paves the way for a range of novel applications based on the controlled reactivity and functionality of this intermediate material and the final consolidation of the 3D-printed part after this second processing stage. In this review, different strategies and the latest developments based on the concept of dual-curing are analyzed, with a focus on the enhanced functionality and emerging applications of the processed materials.

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“…Flatness can be challenging because photocurable resins shrink when crosslinked, inducing mechanical stress that warps the print if not addressed in the print design [33]. Furthermore, an array of microscale ports and enclosed channel had to be integrated in a manner compatible with commercial 3D printers [34], without disrupting the flat surface.…”

Section: Design Goals For a 3d Printed Slipchip With Movable Portsmentioning

confidence: 99%

Rapid fabrication by digital light processing 3D printing of a SlipChip with movable ports for local delivery to ex vivo organ cultures

Catterton

Ball

Pompano

2021

Preprint

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SlipChips are two-part microfluidic devices that can be reconfigured to change fluidic pathways for a wide range of functions, including tissue stimulation. Currently, fabrication of these devices at the prototype stage requires a skilled microfluidic technician, e.g. for wet etching or alignment steps. In most cases, SlipChip functionality requires an optically clear, smooth, and flat patterned surface that is fluorophilic and hydrophobic. Here, we tested digital light processing (DLP) 3D printing, which is rapid, reproducible and easily shared, as a solution for fabrication of SlipChips at the prototype stage. As a case study, we sought to fabricate a SlipChip intended for local de-livery to live tissue slices through a movable microfluidic port. The device was comprised of two multi-layer components: an enclosed channel with a delivery port and a culture chamber for tissue slices with a permeable support. Once the design was optimized, we demonstrated its function by locally delivering a chemical probe to slices of hydrogel and to living tissue with up to 120-µm spatial resolution. By establishing the design principles for 3D printing of SlipChip devices, this work will enhance the ability to rapidly prototype such devices at mid-scale levels of production.

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Investigation of shrinkage-induced stresses in stereolithography photo-curable resins

Cited by 38 publications

References 9 publications

Optimisation of Design and Manufacturing Parameters of 3D Printed Solid Microneedles for Improved Strength, Sharpness, and Drug Delivery

Optimisation of Design and Manufacturing Parameters of 3D Printed Solid Microneedles for Improved Strength, Sharpness, and Drug Delivery

Enhancement of 3D-Printable Materials by Dual-Curing Procedures

Rapid fabrication by digital light processing 3D printing of a SlipChip with movable ports for local delivery to ex vivo organ cultures

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