Physical property of 3D-printed sinusoidal pattern using shape memory TPU filament

Kabir, Shahbaj; Kim, Hyelim; Lee, Sun Hee

doi:10.1177/0040517520919750

Cited by 30 publications

(12 citation statements)

References 18 publications

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“…In the case of FOMM, considering the assumption that it is mostly composed of TPU, it was expected to display an elastomer-like behavior. Indeed, both FOMM and wFOMM showed similar profiles to those found for TPU [50], with low E and σ values. However, the flexural strength of wFOMM is significantly lower than FOMM due to the porous structure of wFOMM.…”

Section: Flexural Testssupporting

confidence: 62%

“…As reported elsewhere [31] TPU displays two glass transitions, the first negative and the second around 70-80 °C. In addition, TPU has a melting temperature, Tm, between 150-160 °C [50], also observed in the FOMM profile. Since these three transitions can be observed in FOMM, it can be con cluded that FOMM contains PVA and TPU.…”

Section: Thermal Characterizationmentioning

confidence: 85%

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3D Printing for Cartilage Replacement: A Preliminary Study to Explore New Polymers

2022

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The use of additive manufacturing technologies for biomedical applications must begin with the knowledge of the material to be used, by envisaging a very specific application rather than a more general aim. In this work, the preliminary study was focused on considering the cartilaginous tissue. This biological tissue exhibits different characteristics, such as thickness and mechanical properties, depending on its specific function in the body. Due to the lack of vascularization, cartilage is a supporting connective tissue with limited capacity for recovery and regeneration. For this reason, any approach, whether to repair/regenerate or as a total replacement, needs to fulfill the adequate mechanical and chemical properties of the surrounding native cartilage to be successful. This work aims to explore the possibility of using new polymers for cartilage total replacement approaches with polymeric materials processed with the specific 3D printing technique of fused filament fabrication (FFF). The materials studied were Nylon® 12 (PA12), already described for this purpose, and LAY-FOMM® 60 (FOMM). FOMM has not been described in the literature for biomedical purposes. Therefore, the chemical, thermal, swelling capacity, and mechanical properties of the filaments were thoroughly characterized to better understand the structure–properties–application relationships of this new polymer. In addition, as the FFF technology is temperature based, the properties were also evaluated in the printed specimens. Due to the envisaged application, the specimens were also characterized in the wet state. When comparing the obtained results with the properties of native cartilage, it was possible to conclude that: (i) PA12 exhibits low swelling capacity, while FOMM, in its dry and wet forms, has a higher swelling capacity, closer to that of native cartilage; (ii) the mechanical properties of the polymeric materials, especially PA12, are higher than those of native cartilage; and (iii) from the mechanical properties evaluated by ultra-micro hardness tests, the values for FOMM indicate that this material could be a good alternative for cartilage replacement in older patients. This preliminary study, essentially devoted to expanding the frontiers of the current state of the art of new polymeric materials, provides valuable indications for future work targeting the envisaged applications.

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Section: Flexural Testssupporting

confidence: 62%

Section: Thermal Characterizationmentioning

confidence: 85%

3D Printing for Cartilage Replacement: A Preliminary Study to Explore New Polymers

2022

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“…The peak at 20.4° represents the existence of a mixed ordered structure of both hard and soft domains and an amorphous phase of the TPU matrix [ 29 ]. The peaks at 25.9° and 40.9° represent the mixing part of hard and soft components of TPU, respectively [ 30 ]. There is no shoulder at 20.4° for the TPU nanofibers from DMF/THF solvent system.…”

Section: Resultsmentioning

confidence: 99%

A Solvent System Involved Fabricating Electrospun Polyurethane Nanofibers for Biomedical Applications

Liu

Wei

et al. 2020

Polymers

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A novel Trichloromethane (TCM)/2,2,2-Trifluoroethanol (TFE) solvent system was developed for fabricating electrospun thermoplastic polyurethane (TPU) nanofibers. TPU solution stability made from this novel solvent system was improved compared to that from the traditional N, N-Dimethylformamide (DMF)/Tetrahydrofuran (THF) solvent system. The minimum TPU solution concentration that can be electrospun was decreased to 0.5% w/v. The conductivity and viscosity of the TPU solution increased with the increasing ratio of TFE in the solvent system. The obtained electrospun TPU nanofibers fabricated from this novel solvent system showed smooth morphology and uniform diameter distribution. Mechanical strength of TPU nanofibers was improved using this new solvent system. Young’s modulus and tensile strength of the electrospun TPU nanofiber meshes first decreased and then increased, while the strain elongation ratio first increased and then decreased. The new solvent system significantly improves the fiber elongation ratio while maintaining the modulus and tensile strength. The chemical structure of the TPU was not affected by the TCM/TFE solvent system. Electrospun TPU nanofiber meshes prepared by using the TCM/TFE solvent system showed better cytocompatibility, which means the electrospun TPU fibrous scaffold has great potential in biomedical application.

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“…In that study, the dynamic mechanical thermal analysis DMTA result of a 3D-printed sinusoidal sample using a shape memory thermoplastic polyurethane SMTPU filament showed double tan δ peak at around 40 °C and 100 °C. Tan δ peak at 40 °C was considered as T g because it had higher intensity than a peak at 100 °C did [ 23 ]. This transformation of 3D-printed sinusoidal sample/nylon composite from STEP-1 to STEP-3 completed one shape memory cycle.…”

Section: Methodsmentioning

confidence: 99%

“…Afterward, the mechanical property of this composite fabric and Poisson’s ratio of 3D-printed auxetic pattern was studied [ 22 ]. Our latest research shed light on the fine structural and mechanical changes that take place at original, temporary, and recovery shape of a 3D-printed auxetic pattern of shape memory thermoplastic polyurethane (SMTPU) filament [ 23 ]. Therefore, this research, as a continuation of our previous work and due to the necessity of evaluating the shape memory property for numerous cycles, aimed to study the shape memory property and tensile property of a 3D-printed sinusoidal sample/nylon composite with various thicknesses up to 50 shape memory cycles.…”

Section: Introductionmentioning

confidence: 99%

Study of Shape Memory and Tensile Property of 3D Printed Sinusoidal Sample/Nylon Composite Focused on Various Thicknesses and Shape Memory Cycles

Kabir

Lee

2020

Polymers

Self Cite

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This study evaluated the shape memory and tensile property of 3D-printed sinusoidal sample/nylon composite for various thickness and cycles. Sinusoidal pattern of five thicknesses: 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, and 1.0 mm were 3D-printed on nylon fabric by the fused deposition modeling (FDM) 3D printer using shape memory thermoplastic polyurethane (SMTPU). Afterward, shape memory and tensile property was investigated up to 50 shape memory cycles. The study found that 3D-printed sinusoidal sample/nylon composite had a 100% shape recovery ratio for various thicknesses up to 50 cycles. The average shape recovery rate gradually decreased from 3.0°/s to 0.7°/s whereas the response time gradually increased with the increase of a 3D-printed pattern thickness. The stress and initial modulus gradually increased with the increase of the cycle’s number. Thus, the shape memory property had a similar tendency for various cycles whereas the tensile property gradually increased with the increase of the cycle number. Moreover, this study demonstrated that this 3D-printed sinusoidal sample/nylon composite can go through more than 50 cycles without losing its tensile or shape memory property. This 3D-printed sinusoidal sample/nylon composite has vast potential as smart, reinforced, and protective clothing that requires complex three-dimensional shapes.

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Physical property of 3D-printed sinusoidal pattern using shape memory TPU filament

Cited by 30 publications

References 18 publications

3D Printing for Cartilage Replacement: A Preliminary Study to Explore New Polymers

3D Printing for Cartilage Replacement: A Preliminary Study to Explore New Polymers

A Solvent System Involved Fabricating Electrospun Polyurethane Nanofibers for Biomedical Applications

Study of Shape Memory and Tensile Property of 3D Printed Sinusoidal Sample/Nylon Composite Focused on Various Thicknesses and Shape Memory Cycles

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