Selective laser sintering of polymer blends: Bulk properties and process behavior

Greiner, Sandra; Wudy, Katrin; Lanzl, Lydia; Drummer, Dietmar

doi:10.1016/j.polymertesting.2017.09.039

Cited by 46 publications

(28 citation statements)

References 23 publications

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“…In some cases, the powder particles are coated with an appropriate surfactant to reduce the surface energy and provide a homogeneous dispersion of nanoparticles in the polymer matrix. Besides, inorganic materials need additional processes to improve the laserparticles interaction [82], [108], [109]. For instance, Zheng et al [109] modified the alumina nanoparticles with a polystyrene coating to form a core-shell polymeric composite which led to a noticeable improvement in the sintering behavior of the mixed powder and an enhancement of the mechanical properties of the printed objects.…”

Section: Powder Based 3d Printingmentioning

confidence: 99%

Smart polymers and nanocomposites for 3D and 4D printing

et al. 2020

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Section: Powder Based 3d Printingmentioning

confidence: 99%

Smart polymers and nanocomposites for 3D and 4D printing

et al. 2020

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“…2), which avoids the solidification of the material until all layers have been sintered [46]. The process of sintering is favoured by a low melt viscosity: due to their higher viscosities at processing conditions, amorphous polymers generally tend to follow a slow sintering rate, resulting in components with greater porosity [40,47].…”

Section: Selective Laser Sinteringmentioning

confidence: 99%

Laser-based additively manufactured polymers: a review on processes and mechanical models

et al. 2020

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Additive manufacturing (AM) is a broad definition of various techniques to produce layer-by-layer objects made of different materials. In this paper, a comprehensive review of laser-based technologies for polymers, including powder bed fusion processes [e.g. selective laser sintering (SLS)] and vat photopolymerisation [e.g. stereolithography (SLA)], is presented, where both the techniques employ a laser source to either melt or cure a raw polymeric material. The aim of the review is twofold: (1) to present the principal theoretical models adopted in the literature to simulate the complex physical phenomena involved in the transformation of the raw material into AM objects and (2) to discuss the influence of process parameters on the physical final properties of the printed objects and in turn on their mechanical performance. The models being presented simulate: the thermal problem along with the thermally activated bonding through sintering of the polymeric powder in SLS; the binding induced by the curing mechanisms of light-induced polymerisation of the liquid material in SLA. Key physical variables in AM objects, such as porosity and degree of cure in SLS and SLA respectively, are discussed in relation to the manufacturing process parameters, as well as to the mechanical resistance and deformability of the objects themselves. Graphic abstract

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“…The rise of digital manufacturing techniques such as Selective Laser Melting (SLM) [36] allows the creation of complex shaped waveguides. Consequently, SLM is increasing being used in the development of acoustic materials due to the ease at which geometry can be customised [37,38].…”

Section: Introductionmentioning

confidence: 99%

Targeted sound attenuation capacity of 3D printed noise cancelling waveguides

Arjunan

2019

Applied Acoustics

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The study explores the creation of 3D printed sound cancelling waveguides that can be customised for selected frequencies as a function of geometry. The potential for attenuation in these waveguides is characterised through experimentally measured acoustic-absorption () and Transmission Loss (TL). This was done to evaluate the potential of geometry-controlled waveguides in the development of passive sound cancelling structures. Geometrically complex waveguides to exploit the Herschel-Quincke-Arjunan (HQA) waveguide model manufactured in Nylon-12 using Selective Laser Melting (SLM) are presented. The attenuation of the waveguides was compared to the bulk Nylon-12 materials to segregate the material-based influence. The results showed that the performance of HQA waveguides can be controlled as a function of length, diameter and waveguide-tortuosity. Accordingly, under right parameters significant improvement in (0.96, 0.80, 0.61 and 0.98) and TL (65.59%, 30.15%, 53.36% and 95.28%) can be achieved at the design frequency. The proposed methodology can be used to develop customisable waveguides exploiting the principles of acoustic wave interference for a range of application including building walls, noise barriers and absorptive panels.

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Selective laser sintering of polymer blends: Bulk properties and process behavior

Cited by 46 publications

References 23 publications

Smart polymers and nanocomposites for 3D and 4D printing

Smart polymers and nanocomposites for 3D and 4D printing

Laser-based additively manufactured polymers: a review on processes and mechanical models

Targeted sound attenuation capacity of 3D printed noise cancelling waveguides

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