Fabrication of thermoplastic polyurethane/polylactide shape-memory blends with tunable optical and mechanical properties via a bilayer structure design

Ji, Xiaoling; Gao, Feng; Geng, Zongze; Li, Dongliang

doi:10.1016/j.polymertesting.2021.107135

Cited by 21 publications

(15 citation statements)

References 35 publications

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“…Combinations of TPU with PLA have been investigated in the relevant literature. Thermoplastic polyurethane and polylactic acid pellets were blended by hot lamination, which helped obtain distinct morphological structures and an analogically better shape-memory effect [ 24 ]. Producing blends via the solvent casting technique demonstrates the feasibility of producing a biocompatible scaffold based on TPU and PLA blends.…”

Section: Introductionmentioning

confidence: 99%

The Influence of 3D Printing Parameters on Adhesion between Polylactic Acid (PLA) and Thermoplastic Polyurethane (TPU)

2021

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A 3D printer in FDM technology allows printing with two nozzles, which creates an opportunity to produce multi-material elements. Printing from two materials requires special consideration of the interface zone generated between their geometrical boundaries. This article aims to present the possibility of printing with PLA and TPU using commercially available filaments and software to obtain the best possible bond strength between two different polymers with respect to printing parameters, surface pattern (due to the material contact surface’s roughness), and the order of layer application. The interaction at the interface of two surfaces of two different filaments (PLA-TPU and TPU-PLA) and six combinations of patterns were tested by printing seven replicas for each. A total of 12 combinations were obtained. By analyzing pairs of samples (the same patterns, different order of materials), the results for the TPU/PLA samples were better or very close to the results for PLA/TPU. The best variants of pattern combinations were distinguished. Well-chosen printing parameters can prevent a drop in parts efficiency compared to component materials (depending on the materials combination).

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Section: Introductionmentioning

confidence: 99%

The Influence of 3D Printing Parameters on Adhesion between Polylactic Acid (PLA) and Thermoplastic Polyurethane (TPU)

2021

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“…However, the increase of the shape recovery ratio was not obvious, less than 10% even after immersion for 72 h, which showed that water had a limited effect on the improvement of shape recovery ability. 47 In addition, for all the specimens, the shape fixation and recovery ratio decreased to some extent with an increase in repeated numbers, 48 the values of both the second and third cycles were lower than that of the first cycle.…”

Section: Resultsmentioning

confidence: 86%

Water-responsive shape memory thermoplastic polyurethane scaffolds triggered at body temperature for bone defect repair

Shuai

Wang

Peng

et al. 2022

Mater. Chem. Front.

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“…This specimen at T f = 100 °C was perfectly fit to the circular shape of the PVC cylinder and the PLA/TPU interfacial surface bonding was intact, as shown in Figure 7 f. This indicated that both PLA and TPU components fully deformed plastically and were supported by their large bend angle seen in the results of the bending tests. The high thermoforming temperature at T f = 100 °C may promote the lamination bond to be re-established during the molding process, as it is closer to the hot lamination temperature of 180 °C used by Ji et al to laminate two flat PLA and TPU together [ 13 ].…”

Section: Resultsmentioning

confidence: 99%

“…The adhesion of the PLA/TPU material should be maintained after the thermoforming process to render the usefulness of the printed product. For this purpose, this paper focuses on direct printing of different materials into a layered structure, although the PLA/TPU multi-material polymers via FDM can also be formed through two other methods: utilization of pre-mixed filament blends of polymers with different proportions, and application of pre-mixed composite filaments consisting of a polymer matrix with the inclusion of filler [ 12 , 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…The challenge of FDM direct-printed multi-material parts is their adhesion. Several researchers investigated the printing parameters on adhesion and properties of multi-material 3D printing for the multi-material structure made with a combination of PLA and TPU [ 13 , 17 , 18 ]. Brancewicz-Steinmetz et al found that proper printing parameters and TPU on PLA print sequences result in better adhesion between materials [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Thermoforming Characteristics of PLA/TPU Multi-Material Specimens Fabricated with Fused Deposition Modelling under Different Temperatures

2022

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Multi-material products are required in fused deposition modelling (FDM) to meet a desired specification such as a rigid structure with soft material for impact protection. This paper focuses on the thermoformability and shape recovery characteristics of three-dimensional (3D)-printed multi-material specimens under different thermoforming temperatures. The multi-material specimens consist of polylactic acid (PLA) and thermoplastic polyurethane (TPU). The PLA/TPU specimens were prepared by depositing the TPU component on top of the PLA component using a fused deposition modelling (FDM) machine. Simple thermoforming tests were proposed, where the specimens were bent under load and molded into a circular shape at different thermoforming temperatures. The bent specimens were then reheated at 60 °C to evaluate their shape memory ability. The test results were quantified into apparent bending modulus and shape recovery percentage. The PLA/TPU specimens showed a better apparent bending modulus of 143 MPa than a PLA specimen at a temperature between 60 °C to 90 °C. However, only the PLA/TPU specimens being thermoformed into a circular shape at 100 °C or greater showed good shape retention accuracy and interfacial surface bonding. The PLA/TPU specimens that were thermoformed at 60 °C to 90 °C showed reasonable shape memory of about 60% recovery when reheated. Finally, suitable thermoforming temperatures for thermoforming PLA/TPU specimens were suggested based on design needs.

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Fabrication of thermoplastic polyurethane/polylactide shape-memory blends with tunable optical and mechanical properties via a bilayer structure design

Cited by 21 publications

References 35 publications

The Influence of 3D Printing Parameters on Adhesion between Polylactic Acid (PLA) and Thermoplastic Polyurethane (TPU)

The Influence of 3D Printing Parameters on Adhesion between Polylactic Acid (PLA) and Thermoplastic Polyurethane (TPU)

Water-responsive shape memory thermoplastic polyurethane scaffolds triggered at body temperature for bone defect repair

Thermoforming Characteristics of PLA/TPU Multi-Material Specimens Fabricated with Fused Deposition Modelling under Different Temperatures

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