Preparation of spherical polymer powders for selective laser sintering from immiscible PA12/PEO blends with high viscosity ratios

Yang, Xinshuang; Yang, Wei; Xi, Shuting; Huang, Yajiang; Kong, Miqiu; Li, Guangxian

doi:10.1016/j.polymer.2019.03.066

Cited by 16 publications

(5 citation statements)

References 43 publications

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“…Other polymers, for example, PBT and PA12 powders, have also been produced through this meltbased method by employing different matrix phases and solvents. [152,153]…”

Section: (24 Of 54)mentioning

confidence: 99%

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Recent Progress on Polymer Materials for Additive Manufacturing

Tan

Zhu

Zhou

2020

Adv Funct Materials

490

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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“…Other polymers, for example, PBT and PA12 powders, have also been produced through this meltbased method by employing different matrix phases and solvents. [152,153]…”

Section: (24 Of 54)mentioning

confidence: 99%

“…Melt-based Melt emulsification/Coextrusion PP [133] PE [152] PBT [152] PA12 [153] • Spherical particle shape…”

Section: Solution-basedmentioning

confidence: 99%

Recent Progress on Polymer Materials for Additive Manufacturing

Tan

Zhu

Zhou

2020

Adv Funct Materials

490

238

View full text Add to dashboard Cite

show abstract

“…As a powder-based AM technique, one of the main limitations of SLS is the lack of materials which meet the process requirementsnear-spherical shape with particle sizes typically of 20-80 mm (Schmid and Wegener, 2016), suitable melt viscosity and wide laser sintering window. With rapid development over the past decade, there are more options of thermoplastic powders applicable to SLS process, such as thermoplastic polyurethane (Schmidt et al, 2016), high-density polyethylene (Wencke et al, 2021), polypropylene (Mwania et al, 2020a(Mwania et al, , 2020b and polyethylene oxide (Yang et al, 2019). Nevertheless, polyamide 12 (PA12) has still dominated the current SLS material market due to its high thermal stability, superior chemical resistance, balanced mechanical properties and good processability (Mwania et al, 2020a(Mwania et al, , 2020b.…”

Section: Introductionmentioning

confidence: 99%

Additive manufacturing of flame retardant polyamide 12 with high mechanical properties from regenerated powder

Tan

et al. 2023

RPJ

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Purpose This paper aims to develop flame-retardant (FR) polyamide 12 (PA12) nanocomposite from regenerated powder via selective laser sintering (SLS), an additive manufacturing technique. Design/methodology/approach First, the morphology, processibility, thermal and mechanical properties of PA12 regenerated powder, consisting of 50 wt% new and 50 wt% recycled powder, as well as corresponding printed specimens, were evaluated to characterize the effects of previous SLS processing. Second, flame-retardant PA12 was developed by incorporating both single and binary halogen-free flame retardants into the regenerated powder. Findings It was found that the printed specimens from regenerated powder had much higher tensile and impact properties compared to specimens made from new powder, which is attributed to better particulate fusion and coalescence realized in higher temperature SLS printing. The effect of FRs on thermal, mechanical and flame retardant properties of the PA12 composites/nanocomposites was investigated systematically. It was found that the nanoclay, as a synergist, improved both flame-retardant and mechanical properties of PA12. UL94 standard rating of V-0 was achieved for the printed nanocomposite by incorporating 1 wt% nanoclay into 15 wt% phosphinates FR. Moreover, on average, the tensile and impact strength of the nanocomposite were increased by 26.13% and 17.09%, respectively, in XY, YZ and Z printing orientations as compared to the equivalent flame retardant composite with 20 wt% of the phosphinates FR. Originality/value This paper fulfills the need to develop flame retardant parts via SLS technology with waste feedstock. It also addresses the challenge of developing flame retardant materials without obviously compromising the mechanical properties by making use of the synergistic effect of nanoclay and organic phosphinates.

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“…Sintering also forms the basis for the additive manufacturing technique (AM) of selective laser sintering (SLS) 19,20 . In this technique, a high‐power laser is scanned over a preheated powder bed layer‐by‐layer according to the 3D representation of the final part, selectively fusing particles by sintering.…”

Section: Introductionmentioning

confidence: 99%

Thermo‐oxidative degradation during sintering of polyethylene particles

Salehi

Pircheraghi

2020

J of Applied Polymer Sci

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Polymer sintering is not only a well‐established procedure for producing functional polymeric parts, but it is also the basis for the relatively new additive manufacturing technique, selective laser sintering. Although studying the impact of thermo‐oxidative degradation during sintering has significant practical importance, few studies have focused on this aspect of the sintering process. In the present work, we have investigated the active thermo‐oxidative degradation mechanisms during sintering of high‐density polyethylene (HDPE) particles, the conditions that promote them, and their respective impact on the morphological evolution of the polyethylene particles. To perform a comprehensive study, we have complemented the rheological, thermal, chemical, and morphological analysis of the sintered HDPE particles with the study of their ensemble pore structure. We observed two distinct degradation regimes. At the beginning, the relatively low concentration of oxygen in the particles led to the dominance of branching and resulted in a pore structure evolution limited to surface relaxation. In the second regime and with the diffusion of more oxygen, chain scission became the dominant route. In this regime, the emergence of highly mobile short chains markedly accelerated the pore evolution.

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Preparation of spherical polymer powders for selective laser sintering from immiscible PA12/PEO blends with high viscosity ratios

Cited by 16 publications

References 43 publications

Recent Progress on Polymer Materials for Additive Manufacturing

Recent Progress on Polymer Materials for Additive Manufacturing

Additive manufacturing of flame retardant polyamide 12 with high mechanical properties from regenerated powder

Thermo‐oxidative degradation during sintering of polyethylene particles

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