Comparative study on the selective laser sintering of polypropylene homopolymer and copolymer: processability, crystallization kinetics, crystal phases and mechanical properties

Tan, Lisa Jiaying; Zhu, Wei; Sagar, Kaushal Shashikant; Zhou, Kun

doi:10.1016/j.addma.2020.101610

Cited by 25 publications

(36 citation statements)

References 55 publications

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“…After this step, the building platform is placed lower, and nozzles spread the following polymer powder layer. The process is repeated until a full 3D print is finished [ 6 ]. One of the most significant advantages of the SLS method over other 3D printing techniques is the possible production of fully functional prototypes with the same mechanical properties as conventionally produced parts by injection molding or milling.…”

Section: Introductionmentioning

confidence: 99%

Polyamide 12 Materials Study of Morpho-Structural Changes during Laser Sintering of 3D Printing

et al. 2021

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The polyamide (PA)-12 material used for additive manufacturing was studied in aspects of morphology and their structural properties for basic stages received during 3D laser printing. Samples were real, big-scale production powders. The structure of polymer was evaluated from the crystallinity point of view using XRD, FTIR, and DSC methods and from the surface properties using specific surface evaluation and porosity. Scanning electron microscopy was used to observe morphology of the surface and evaluate the particle size and shape via image analysis. Results were confronted with laser diffraction particles size measurement along with an evaluation of the specific surface area. Fresh PA12 powder was found as inhomogeneous in particle size of material with defective particles, relatively high specific surface, high lamellar crystallite size, and low crystallinity. The scrap PA12 crystallinity was about 2% higher than values for fresh PA12 powder. Particles had a very low, below 1 m2/g, specific surface area; particles sintered as twin particles and often in polyhedral shapes.

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Section: Introductionmentioning

confidence: 99%

Polyamide 12 Materials Study of Morpho-Structural Changes during Laser Sintering of 3D Printing

et al. 2021

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“…Therefore, many researchers focus on establishing the technology-property relation by conducting mechanical tests 1,2 and structural evaluation 3 and assessing the geometrical aspects 4,5 of the AM parts. SLS is one of the AM technologies that belongs to the powder bed fusion branch.…”

Section: Introductionmentioning

confidence: 99%

“…Its biocompatibility makes it a good candidate for disposable elements in medical field. 12,13 The physical properties of PA2200 as the manufacturer indicate are grain size 56 μm (ISO 13320-11) 14 ; bulk density 0.45 g/cm 3 (EN ISO 60) 15 ; melting point 172-180 C (EN ISO 11357-1). 16 The AM process was conducted on EOS Formiga P100 (EOS GmbH Electro Optical Systems) on 3D samples designed according to ASTM D5045-99 and ASTM D5528-01, respectively.…”

Section: Introductionmentioning

confidence: 99%

Fracture toughness in additive manufacturing by selective laser sintering: an overview

Marșavina

Stoia

Linul

2021

Mat Design & Process Comms

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This paper presents manufacturing, testing, and computing steps for determining the fracture toughness property of polyamide PA 2200 processed by laser sintering using different process parameters. The design of the samples was conducted according to ASTM D5045-99 and ASTM D5528-01, and the fracture tests consist of four-point bending in symmetric and asymmetric configuration and double cantilever beam test. The process parameters selected as variables were in-plane orientation, spatial orientation, energy density of the process, and induced structural defects. The results provide an extended view regarding the variation of fracture properties when the manufacturing conditions in laser sintering are changed.

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“…A high enthalpy of melting is favorable for diminishing caking that results from melting of particle surface outside the laser scanning region by scattering. [66] Caking, the adhesion of particles to the built part, may also be reduced by the addition of IR absorbers, like carbon black (CB).…”

Section: Pbf Suitabilitymentioning

confidence: 99%

Toward the Direct Synthesis of HDPE Powders for Powder Bed Fusion Based Additive Manufacturing

Wencke¹,

Proes

Imgrund

et al. 2021

Macro Materials & Eng

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Powder bed fusion (PBF) suitable polyethylene particles are targeted by means of a direct synthesis, using a bisimino pyridine iron catalyst (BIP FeCl 2 ) supported on microsized silica particles. An active support is generated by treating spray dried silica microparticles with a methyl aluminoxane activated BIP FeCl 2 catalyst in toluene. Semibatch ethylene polymerization is mapped with respect to pressure, temperature, and reaction time to find optimal reaction parameters. The optimized synthesis leads to round polyethylene particles with a median size of ≈50 μm which have a sinter window of 8-15 °C and an unconfined yield stress (ffc) of 1.5 in a ring shear tester. The Young modulus of injection molded samples is in the range of 150-250 Pa with an elongation at break of about 30%. The powder flowability is improved by coating with nanosilica powder to an ffc of 3.8. Additivitation with carbon black allows to laser sinter the powder to solid parts in a small scale adapted setup for selective laser sintering (PBF/laser beam (LB)/P). Severe caking is preventing the preparation of CAD model conform parts. Commercial HDPE powder for PBF is additivated the same way to give substantially solid built parts, but with similar caking.

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Comparative study on the selective laser sintering of polypropylene homopolymer and copolymer: processability, crystallization kinetics, crystal phases and mechanical properties

Cited by 25 publications

References 55 publications

Polyamide 12 Materials Study of Morpho-Structural Changes during Laser Sintering of 3D Printing

Polyamide 12 Materials Study of Morpho-Structural Changes during Laser Sintering of 3D Printing

Fracture toughness in additive manufacturing by selective laser sintering: an overview

Toward the Direct Synthesis of HDPE Powders for Powder Bed Fusion Based Additive Manufacturing

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