Polyamide 11 nanocomposite feedstocks for powder bed fusion via liquid-liquid phase separation and crystallization

Tischer, Florentin; Cholewa, Simon; Düsenberg, Björn; Drummer, Dietmar; Peukert, Wolfgang; Schmidt, Jochen

doi:10.1016/j.powtec.2023.118563

Cited by 6 publications

(2 citation statements)

References 67 publications

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“…The crystallization temperature also shifted to higher values, indicating that the starch particles acted as nucleation sites during polymer crystallization from the melt, lowering the energy barrier of nucleation. As a result, less supercooling of the melt was required to initiate crystallization, leading to a shift in the crystallization temperature to higher values . Previous studies have reported that higher crystallization temperatures can lead to increased crystallinity in the polymer matrix .…”

Section: Resultsmentioning

confidence: 99%

“…As a result, less supercooling of the melt was required to initiate crystallization, leading to a shift in the crystallization temperature to higher values. 68 Previous studies have reported that higher crystallization temperatures can lead to increased crystallinity in the polymer matrix. 37 Consequently, the degree of crystallinity (χ c ) increased from 10.85% in the plain copolymer to 12.96% in the PSMS50 composite.…”

Section: Resultsmentioning

confidence: 99%

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Heat-Induced Actuator Fibers: Starch-Containing Biopolyamide Composites for Functional Textiles

Baniasadi,

Madani,

Mohan

et al. 2023

ACS Appl. Mater. Interfaces

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This study introduces the development of a thermally responsive shape-morphing fabric using low-melting-point polyamide shape memory actuators. To facilitate the blending of biomaterials, we report the synthesis and characterization of a biopolyamide with a relatively low melting point. Additionally, we present a straightforward and solvent-free method for the compatibilization of starch particles with the synthesized biopolyamide, aiming to enhance the sustainability of polyamide and customize the actuation temperature. Subsequently, homogeneous dispersion of up to 70 wt % compatibilized starch particles into the matrix is achieved. The resulting composites exhibit excellent mechanical properties comparable to those reported for soft and tough materials, making them well suited for textile integration. Furthermore, cyclic thermomechanical tests were conducted to evaluate the shape memory and shape recovery of both plain polyamide and composites. The results confirmed their remarkable shape recovery properties. To demonstrate the potential application of biocomposites in textiles, a heat-responsive fabric was created using thermoresponsive shape memory polymer actuators composed of a biocomposite containing 50 wt % compatibilized starch. This fabric demonstrates the ability to repeatedly undergo significant heat-induced deformations by opening and closing pores, thereby exposing hidden functionalities through heat stimulation. This innovative approach provides a convenient pathway for designing heat-responsive textiles, adding value to state-of-the-art smart textiles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Heat-Induced Actuator Fibers: Starch-Containing Biopolyamide Composites for Functional Textiles

Baniasadi,

Madani,

Mohan

et al. 2023

ACS Appl. Mater. Interfaces

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β-Modification in heterogeneous polypropylene for laser-based powder bed fusion of polymers

Cholewa,

Forstner,

Jaksch

et al. 2024

Prog Addit Manuf

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Currently, polyamides serve as the primary material used in laser-based powder bed fusion of polymers (PBF-LB/P), which prevents the components from exhibiting the mechanical characteristics of traditional manufacturing techniques. As a result, highly ductile and chemical-resistant materials are needed to cover more potential application areas. The preferred material is polypropylene (PP) with various structures and settings. A common practice in conventional manufacturing processes is adjusting the morphology of the component, but studies examining this type of influence in PBF-LB/P are scarce. In addition to examining important PBF-LB/P process characteristics like thermal properties and powder flow behavior, this work first presents potential nucleation agents and then manufactures components to assess the impact of the structure. It was concluded that processing the material is possible despite significantly higher crystallization kinetics. A parameter study was conducted to evaluate the initial PBF-LB/P processability by building single and triple layers. These results led to the creation of mechanical specimens that showed the material system’s processability. For the first time, it was possible to process β-nucleated PP, which displays increased elongation at break for higher β-content.

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Magnetic polyamide 11 powder for the powder bed fusion process by liquid-liquid phase separation and crystallization

Tischer,

Cholewa,

Groppe

et al. 2024

Additive Manufacturing

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Polyamide 11 nanocomposite feedstocks for powder bed fusion via liquid-liquid phase separation and crystallization

Cited by 6 publications

References 67 publications

Heat-Induced Actuator Fibers: Starch-Containing Biopolyamide Composites for Functional Textiles

Heat-Induced Actuator Fibers: Starch-Containing Biopolyamide Composites for Functional Textiles

β-Modification in heterogeneous polypropylene for laser-based powder bed fusion of polymers

Magnetic polyamide 11 powder for the powder bed fusion process by liquid-liquid phase separation and crystallization

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