The re-usability of heat-exposed poly (ethylene terephthalate) powder for laser sintering

Gu, Hao; Bashir, Z.; Yang, Lanti

doi:10.1016/j.addma.2019.05.004

Cited by 17 publications

(28 citation statements)

References 16 publications

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“…Polyamide 12 (PA12), as a semicrystalline polymer, has low water absorption, good dimensional stability, low melting temperature, and wide laser sintering window. It is one of the most widely used raw materials in SLS 3D‐printing technology currently . However, its own thermal insulation property cannot meet the demand for the higher thermal conductivity in the electrical engineering, heat transfer engineering, and other areas.…”

Section: Introductionmentioning

confidence: 99%

Solid‐state shear milling method to prepare PA12/boron nitride thermal conductive composite powders and their selective laser sintering 3D‐printing

Yang

Wang

Chen

2019

J of Applied Polymer Sci

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The selective laser sintering (SLS) is one of the most important 3D‐printing technologies. However, the challenges in SLS could be in the limited high material cost and single material performance. Development of high‐performance and multifunctional copowders suitable for SLS is of great importance. Here, polyamide 12 (PA12)/boron nitride (BN) thermal conductive copowders suitable for SLS were successfully prepared through solid state shear milling (S3M) technology in combination with cryogenic pulverization technology. The particle size, morphology, grafting reaction between PA12 and BN, rheology behavior, and coalescence behavior of the obtained PA12/BN copowders were carefully investigated. The optimal amount of silica flow additive (0.5 wt %) was determined to achieve the good powder flowability. Under the optimum 3D‐printing conditions, the fabrication of parts with high BN loading could be achieved. When BN content was at 40 wt %, the flexural strength could reach 10.6 MPa and the thermal conductivity could reach 0.55 W/m·k, 77% higher than that of pure PA12. After treated with phenolic epoxy resin, the tensile strength and flexural strength of the printed parts with 40 wt % BN loading could reach 14.2 and 25.6 MPa, which were 130 and 115% higher than those of the untreated 3D‐printed parts, respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48766.

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Section: Introductionmentioning

confidence: 99%

Solid‐state shear milling method to prepare PA12/boron nitride thermal conductive composite powders and their selective laser sintering 3D‐printing

Yang

Wang

Chen

2019

J of Applied Polymer Sci

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“…In PET powder T1 also, and in our previous works with high I.V. PET powder, the printed PET parts were indeed crystalline, but the heat of fusion was typically 30-45 J/g; that is, generally lower than the starting powder [4,9].…”

Section: Pet Powder T2 Printed In the Commercial Machinementioning

confidence: 60%

“…A laboratory machine Rig P250U (Fraunhofer, Oberhausen, Germany) was used for the printing with PET powder T1. The machine is a prototype machine on which we completed our previous work [4,9]. It had a dry nitrogen flow kept over the head space of the powder bed to minimize degradation.…”

Section: Methodsmentioning

confidence: 99%

“…Many papers and data sheets of laser sintered/melted plastics only report the mechanical properties based on xy direction builds of tensile bars (see Figure 2) [15]. Indeed, in our previous works on PET [4,9], we had only obtained the xy orientation mechanical properties at that time. However, for a complete acceptance of a new material, it is necessary to provide the mechanical properties of xy, xz, and zx build orientations.…”

Section: Mechanical Properties Of Articles Printed From Pet Powder T1mentioning

confidence: 99%

“…The surface finish was even better than that obtained with printed PA12. In a second work, we showed the PET also had good re-use capability, for unfused but heat-exposed powder [9]. However, in these works, the laser processing parameters and only the very basic mechanical properties of an xy orientation build were reported from printed bars.…”

Section: Introductionmentioning

confidence: 98%

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Poly(ethylene terephthalate) Powder—A Versatile Material for Additive Manufacturing

AlFayez

Ahmed

et al. 2019

Polymers

Self Cite

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The 3D printing of articles by the effect of a directed laser beam on a plastic powder is a demanding process, and unlike injection molding, very few polymers work well enough with it. Recently, we reported that poly(ethylene terephthalate) (PET) powder has intrinsically good properties for 3D printing. Basic mechanical properties were shown earlier and it was demonstrated that unfused but heat-exposed PET powder does not degrade quickly allowing good re-use potential. In this work, we conducted a detailed comparison of the mechanical properties of PET and polyamide 12 from different build orientations. PET powders with two different molecular weights were used. With the high molecular weight powder, the processing parameters were optimized, and the printed bars showed little difference between the different orientations, which means there is low anisotropy in mechanical properties of built parts. Based on processing experience of the first powder, the second powder with a lower molecular weight was also very printable and complex parts were made with ease from the initial printing trials; since the process parameters were not optimized then, lower mechanical properties were obtained. While the intrinsic material properties of PET (melting and re-crystallization kinetics) are not the best for injection molding, PET is eminently suitable for powder bed fusion.

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Recent Progress on Polymer Materials for Additive Manufacturing

Tan

Zhu

Zhou

2020

Adv Funct Materials

404

238

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Additive manufacturing (AM) is the process of printing 3D objects in a layer-by-layer manner. Polymers and their composites are some of the most widely used materials in modern industries and are of great interest in the field of AM due to their vast potential for various applications, especially in the medical, aerospace, and automotive industries. Many studies have been conducted to develop new polymer materials for AM techniques, which include vat photopolymerization, material jetting, powder bed fusion, material extrusion, binder jetting, and sheet lamination. Although several reviews on the development of polymer materials for AM have been published, most of them only focus on a specific application, process, or type of material. Therefore, this article serves to provide a comprehensive review on the progress in polymer material development for AM techniques. It begins with an introduction to different AM techniques, followed by highlighting the progress of their development. Material requirements, notable advances in newly developed materials and their potential applications are discussed in detail and summarized. This review concludes by identifying the major challenges currently encountered in using AM for polymer materials and providing insights into the valuable opportunities it presents, in hopes of spurring further development in this field.

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The re-usability of heat-exposed poly (ethylene terephthalate) powder for laser sintering

Cited by 17 publications

References 16 publications

Solid‐state shear milling method to prepare PA12/boron nitride thermal conductive composite powders and their selective laser sintering 3D‐printing

Solid‐state shear milling method to prepare PA12/boron nitride thermal conductive composite powders and their selective laser sintering 3D‐printing

Poly(ethylene terephthalate) Powder—A Versatile Material for Additive Manufacturing

Recent Progress on Polymer Materials for Additive Manufacturing

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