Development of polypropylene-based composites through fused filament fabrication: The effect of carbon-based fillers

Casamento, Francesco; Padovano, Elisa; Pappalardo, Stefano; Frache, Alberto; Badini, Claudio Francesco

doi:10.1016/j.compositesa.2022.107308

Cited by 14 publications

(11 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…15 Also, with respect to the high thermal stability (in the range of 720 to 2000 °C) of CNTs, they can act as thermal stabilizers, which could be due to various mechanisms. 54 Thus, it is expected that the addition of CNT nanofillers to the polymer matrix would improve the thermal stability. However, based on low CNT content, the fabricated aerogels presented relatively similar decomposition temperatures, which are yet superior to the aerogels made from other materials.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In general, PIs are well-known for their high service temperature . Also, with respect to the high thermal stability (in the range of 720 to 2000 °C) of CNTs, they can act as thermal stabilizers, which could be due to various mechanisms . Thus, it is expected that the addition of CNT nanofillers to the polymer matrix would improve the thermal stability.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Flexible, Thermally Stable, and Ultralightweight Polyimide-CNT Aerogel Composite Films for Energy Storage Applications

Aghababaei Tafreshi,

Saadatnia,

Ghaffari-Mosanenzadeh

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Polyimide (PI) aerogels are promising in various fields of application, ranging from thermal insulators to aerospace. However, they are typically in the form of a bulk monolith, which suffers from a lack of conformability and drapability. Moreover, their electrical conductivity is limited, and they mainly display an insulative behavior. These shortcomings can limit the applications of PI aerogels in energy storage systems, which require ultralightweight flexible conductive films, which at the same time offer high thermal stability, ultralow density, and high surface area. To overcome these obstacles, the present study reports the fabrication of PI-carbon nanotube (PI-CNT) aerogel composite films with varying CNT content prepared through a sol−gel preparation method, followed by a supercritical drying procedure. Compared to pristine PI aerogels, which displayed a large shrinkage and density of 18.3% and 0.12 g cm −3 , respectively, the incorporation of only 5 wt % CNTs resulted in a significant reduction of both shrinkage and density to only 11.5% and 0.10 g cm −3 , respectively. This suggests the importance of CNTs in improving the dimensional stability of aerogels and creating a robust network. Further characterizations showed that incorporation of 5 wt % CNTs also resulted in the highest pore volume (1.25 cm 3 g −1 ), highest surface area (324 m 2 g −1 ), highest real permittivity (80), highest electrical conductivity (3 × 10 −1 S m −1 ), and ultrahigh service temperature (575 °C). It was also shown that the aerogel films can withstand a large degree of bending, can be twisted, and can be fully rolled with no obvious cracks propagated in the structure. The combined outstanding properties of the developed aerogel composite films make them promising potential candidates for supercapacitor electrodes. Therefore, the electrochemical performance of the devices based on aerogel electrodes was further studied. The device demonstrated a high energy density of 2.6 Wh kg −1 at a power density of 303.8 W kg −1 . The total capacitance after 5000 cycles was 91.8% of the initial capacitance, which indicated excellent stability and durability of the device. Overall, this work provides a facile yet effective methodology for the development of high-performance aerogel materials for energy storage applications.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Flexible, Thermally Stable, and Ultralightweight Polyimide-CNT Aerogel Composite Films for Energy Storage Applications

Aghababaei Tafreshi,

Saadatnia,

Ghaffari-Mosanenzadeh

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Fewer researchers have investigated the influence of short-fibre orientation effects on the mechanical performance of 3D-printed parts. Casamento et al [ 26 ] found that the inclusion of short carbon fibres was superior at increasing mechanical performance compared to carbon nanotubes. Peng et al [ 27 ] investigated the tensile properties of short carbon fibre-reinforced polyamide-6 printed with an infill direction at 90°, ±45° and 0° to the loading direction, finding an increase in Young’s modulus and tensile strength with reducing the infill angle.…”

Section: Introductionmentioning

confidence: 99%

Tension and Compression Properties of 3D-Printed Composites: Print Orientation and Strain Rate Effects

et al. 2023

View full text Add to dashboard Cite

This study examines the impact of three factors on the tensile and compressive behaviour of 3D-printed parts: (1) the addition of short carbon fibres to the nylon filament used for 3D printing, (2) the infill pattern, and (3) the speed at which the materials are strained during testing. The results show that adding carbon fibres to the nylon filament reduces variability between tests and emphasises the effect of print orientation. When the infill pattern is aligned with the direction of loading, the tensile strength of all samples increases, with the largest increase of 100% observed in the carbon fibre-reinforced samples, compared to a 37% increase in the strength of nylon samples. The carbon fibre-reinforced samples are also highly dependent on strain rate, with a 60% increase in tensile strength observed at a faster testing speed of 300 mm/min (9 min−1) compared to 5 mm/min (15 min−1). Nylon samples show a decrease of approximately 10% in tensile strength at the same increased speed. The compressive strength of the composite samples increases by up to 130% when the print path is parallel to the loading direction. Increases of up to 50% are observed in the compressive modulus of the composite samples at a test speed of 255 mm/min (9 min−1) compared to 1.3 mm/min (0.05 min−1). Similar trends are not seen in pure nylon samples. This study is the first to report on the variation of Poisson’s ratio of short carbon fibre-reinforced 3D-printed parts. The results show increases of up to 34% and 76% in the tensile and compressive Poisson’s ratios, respectively, when printing parameters are altered. The findings from this research will contribute to the design and numerical modelling of 3D-printed composites.

show abstract

“…38 In this regard, polymer blending and filler compounding of the filament material have been described to lower the melting temperature, broaden the thermal stability range, or tailor the rheological properties, leading to a higher resolution of 3D-printed scaffolds. 39,40 Therefore, in the present study, we aimed to advance and support the use of a solvent-free, low-cost, and straightforward AM technology, such as FFF, for the fabrication of 3D-printed scaffolds. We wanted these scaffolds to be able to support tissue regeneration processes and to be bioresorbable so that they could be naturally reabsorbed by the human body at the end of the healing process.…”

Section: Introductionmentioning

confidence: 99%

“…To be processed in FFF, the polymer should have sufficient thermal stability and an adequate rheological behavior to avoid a drop in molecular weight due to thermal degradation during the printing process . In this regard, polymer blending and filler compounding of the filament material have been described to lower the melting temperature, broaden the thermal stability range, or tailor the rheological properties, leading to a higher resolution of 3D-printed scaffolds. , …”

Section: Introductionmentioning

confidence: 99%

3D-Printed Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)-Cellulose-Based Scaffolds for Biomedical Applications

Giubilini,

Messori,

Bondioli

et al. 2023

Biomacromolecules

View full text Add to dashboard Cite

While biomaterials have become indispensable for a wide range of tissue repair strategies, second removal procedures oftentimes needed in the case of non-bio-based and nonbioresorbable scaffolds are associated with significant drawbacks not only for the patient, including the risk of infection, impaired healing, or tissue damage, but also for the healthcare system in terms of cost and resources. New biopolymers are increasingly being investigated in the field of tissue regeneration, but their widespread use is still hampered by limitations regarding mechanical, biological, and functional performance when compared to traditional materials. Therefore, a common strategy to tune and broaden the final properties of biopolymers is through the effect of different reinforcing agents. This research work focused on the fabrication and characterization of a bio-based and bioresorbable composite material obtained by compounding a poly(3hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) matrix with acetylated cellulose nanocrystals (CNCs). The developed biocomposite was further processed to obtain three-dimensional scaffolds by additive manufacturing (AM). The 3D printability of the PHBH−CNC biocomposites was demonstrated by realizing different scaffold geometries, and the results of in vitro cell viability studies provided a clear indication of the cytocompatibility of the biocomposites. Moreover, the CNC content proved to be an important parameter in tuning the different functional properties of the scaffolds. It was demonstrated that the water affinity, surface roughness, and in vitro degradability rate of biocomposites increase with increasing CNC content. Therefore, this tailoring effect of CNC can expand the potential field of use of the PHBH biopolymer, making it an attractive candidate for a variety of tissue engineering applications.

show abstract

Development of polypropylene-based composites through fused filament fabrication: The effect of carbon-based fillers

Cited by 14 publications

References 29 publications

Flexible, Thermally Stable, and Ultralightweight Polyimide-CNT Aerogel Composite Films for Energy Storage Applications

Flexible, Thermally Stable, and Ultralightweight Polyimide-CNT Aerogel Composite Films for Energy Storage Applications

Tension and Compression Properties of 3D-Printed Composites: Print Orientation and Strain Rate Effects

3D-Printed Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)-Cellulose-Based Scaffolds for Biomedical Applications

Contact Info

Product

Resources

About