Production of PBT/PC multi-material particles via a combination of co-grinding and spray-agglomeration for powder bed fusion

Riedel, Florentin; Düsenberg, Björn; Schmidt, Jochen; Bück, Andreas

doi:10.1016/j.procir.2020.09.020

Cited by 9 publications

(5 citation statements)

References 10 publications

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“…[5,12] In melt emulsification the identification of proper polymer-solvent systems that allow for emulsion stability is crucial, while in co-extrusion the recovery of the formed spherical particles from the water-soluble polymer is somehow laborious. Further manufacturing methods for spherical PBF-LB/P powders are dry or wet comminution [13] followed by additional process steps for shape modification and improvement of flowability and packing characteristics, that is, thermal rounding, plasma functionalization, [14] dry coating, [15] and spray drying [16][17][18] The above listed production routes were demonstrated as feasible approaches towards the preparation of polymeric microparticles with spherical morphology. Although tailoring the thermal and phase-morphological properties with these approaches is very limited.…”

Section: Introductionmentioning

confidence: 99%

Semi‐Crystalline Polyetherimide Microparticles via Liquid‐Liquid Phase Separation and Precipitation

Unger

Dechet

Fischer

et al. 2022

Macro Materials & Eng

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A novel approach for production of polyetherimide (PEI) microparticles by liquid–liquid phase separation (LLPS) and precipitation is demonstrated and the effect of the used solvents acetophenone and dimethyl phthalate on the obtained powders is outlined. Interestingly, the method allows one to produce semi‐crystalline particles, while PEI is known to be hard to crystallize and typically obtained in amorphous form. To get a deeper understanding of the phase behavior of the polymer‐solvent systems, cloud point curves in dependence on system composition are determined. The obtained particles are thoroughly characterized. They are highly semi‐crystalline, as proven by DSC and X‐ray diffraction and are an ideal novel feedstock for powder bed fusion of polymers with laser beam (PBF‐LB/P). Polymorphism and, thus, thermal characteristics like the melting point, can be tuned by the used solvent. After heating the precipitated powder samples above their melting temperature and subsequent cooling fully amorphous polymer is obtained, which is assessed to be advantageous with respect to mechanical properties (toughness) of the PBF‐LB/P‐produced component from this novel feedstock.

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Section: Introductionmentioning

confidence: 99%

Semi‐Crystalline Polyetherimide Microparticles via Liquid‐Liquid Phase Separation and Precipitation

Unger

Dechet

Fischer

et al. 2022

Macro Materials & Eng

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“…The most widely used polymer in L-PBF is currently polyamide 12 with about 90% of the market share [ 2 ]. Many other materials such as polybutylene terephthalate [ 3 , 4 ]; polyethylene terephthalate [ 5 ]; polyamide 11 [ 6 , 7 ]; polyether ether ketone [ 8 , 9 ]; polystyrene [ 10 ]; and polypropylene (PP) [ 11 , 12 ]; as well as polymer composites, for example, polybutylene terephthalate—polycarbonate [ 13 , 14 , 15 ] are used. However, not all have made it to market maturity yet due to the high demands on the powder properties, such as good flowability and a narrow particle size distribution.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Photoelectric Powder Deposition of Polymers by Charge Control Substances

et al. 2022

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Charge control substances (CCS) as additives for polymer powders are investigated to make polymer powders suitable for the electrophotographic powder deposition in powder-based additive manufacturing. The use of CCS unifies the occurring charge of a powder, which is crucial for this novel deposition method. Therefore, commercially available polymer powder is functionalized via dry coating in a shaker mixer with two different CCS and analyzed afterwards. The flowability and the degree of coverage of additives on the surface are used to evaluate the coating process. The thermal properties are analyzed by use of differential scanning calorimetry. Most important, the influence of the CCS on the powder charge is shown by measurements of the electrostatic surface potential at first and the powder deposition itself is performed and analyzed with selected formulations afterwards to show the potential of this method. Finally, tensile strength specimens are produced with the conventional deposition method in order to show the usability of the CCS for current machines.

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“…Out of this interest a variety of several new and potential blends for industrial applications has been developed in recent years. This is due to the wide margin of superior properties compared to conventional materials [ 8 , 9 , 10 , 11 ]. These include in particular polymer combinations, which often provide a higher strength-to-weight ratio, simple product property customization, flexible manufacturing processes and lower cost.…”

Section: Introductionmentioning

confidence: 99%

Control of Crystallization of PBT-PC Blends by Anisotropic SiO2 and GeO2 Glass Flakes

et al. 2022

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Polymer composites and blend systems are of increasing importance, due to the combination of unique and different material properties. Blending polybutylene terephatalte (PBT) with polycarbonate (PC) has been the focus of attention for some time in order to combine thermo-chemical with mechanical resistance. The right compounding of the two polymers is a particular challenge, since phase boundaries between PBT and PC lead to coalescence during melting, and thus to unwanted segregation within the composite material. Amorphization of the semi-crystalline PBT would significantly improve the blending of the two polymers, which is why specific miscibility aids are needed for this purpose. Recent research has focused on the functionalization of polymers with shape-anisotropic glass particles. The advantage of those results from their two-dimensional shape, which not only improves the mechanical properties but are also suspected to act as miscibility aids, as they could catalyze transesterification or act as crystallization modifier. This work presents a process route for the production of PBT-PC blends via co-comminution and an in-situ additivation of the polymer blend particles with anisotropic glass flakes to adjust the crystallinity and therefore enhance the miscibility of the polymers.

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Production of PBT/PC multi-material particles via a combination of co-grinding and spray-agglomeration for powder bed fusion

Cited by 9 publications

References 10 publications

Semi‐Crystalline Polyetherimide Microparticles via Liquid‐Liquid Phase Separation and Precipitation

Semi‐Crystalline Polyetherimide Microparticles via Liquid‐Liquid Phase Separation and Precipitation

Enhancing Photoelectric Powder Deposition of Polymers by Charge Control Substances

Control of Crystallization of PBT-PC Blends by Anisotropic SiO2 and GeO2 Glass Flakes

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