PEEK -TiO2 composites with enhanced UV resistance

Thermally conductive but electrically insulating polymer matrix composites are of great interest in many engineering applications such as thermal management applications (i.e., heat sinks in microelectronic packaging, cooling of mechatronic components and mechanisms). Among possible functional fillers, hexagonal boron nitride seems to be one of the most promising choice due to its high thermal conductivity, and in this work, it was used as filler of polyamide 6 matrix. The resulting composites were first prepared in the form of pellets, extruded into filaments, and successively 3D printed, with the aim to study and compare the thermal performances of the 3D printed samples to the ones manufactured using traditional compression molding technique. The thermal conductivity of 25% wt and 45% wt loaded compression molded samples were 1 and 2.5 W/mK, respectively, while the neat polymer showed a thermal conductivity of 0.29 W/mK. 3D printed samples showed the same trend, namely increasing thermal conductivity with filler amount, despite a great influence of the 3D printing processing parameters (i.e., melt rheology and printing temperature), which lower the resulting thermal conductivity. 3D printed 25% and 45% by weight loaded samples showed a through plane thermal conductivity of 0.67 and 0.92 W/mK, respectively, and in‐plane thermal conductivity of 0.96 and 1.52 W/mK due to the presence of porosity and filler alignment along the printing direction.

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“…This is an expected result since a hard and stiff ceramic filler is added to the polymer matrix. [ 48, 49 ]…”

Section: Resultsmentioning

confidence: 99%

A comparison of thermally conductive polyamide 6‐boron nitride composites produced via additive layer manufacturing and compression molding

et al. 2021

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“…50 The particle-matrix adhesion and consequently the mechanical properties are also related to the filler and matrix chemical compatibility, the filler particle size, shape, and loading. 51,52 Morphology of coated sensors and electrical properties SEM observations of nanocomposite coatings morphology are shown in Figure 8. MWCNTs (Figure 8(a)) appear to be randomly and homogenously distributed within the epoxy matrix, while on the other hand, some GNP aggregates in the matrix have been detected (Figure 8(b)).…”

Section: Preliminary Characterizationsmentioning

confidence: 99%

Graphene nanoplatelet, multiwall carbon nanotube, and hybrid multiwall carbon nanotube–graphene nanoplatelet epoxy nanocomposites as strain sensing coatings

Bragaglia

Paleari

Lamastra

et al. 2021

Journal of Reinforced Plastics and Composites

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Strain monitoring is of great interest in order to check components structural life, to prevent catastrophic failures, and, possibly, to predict residual life in case of unexpected events. In this study, strain sensing epoxy-based coatings containing carbon nanotubes (MWCNTs), graphene nanoplatelets (GNPs), and a mix of the two (MWCNT+GNP) have been produced, with the same initial electrical resistivity, and applied on glass fiber reinforced composites. Morphological, mechanical, and electrical tests have been then performed evaluating the resistance variation and the strain sensing performance of the sensors. A theoretical model to relate the resulting gauge factors to the different types of nanofillers has been applied. The results showed that all systems present a strain sensing performance with different gauge factors (and hence sensitivity) at low strain: GNP samples showed the highest gauge factor (10.3), MWCNT samples the lowest (1.5), and the mixed system lies in the middle (4.3). From analytical analysis, the value of initial distance among conductive particles was found to be 0.3 nm in the case of MWCNT and 1.2 nm for GNP, explaining why the gauge factors of the produced sensors are different.

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“…PEEK is a well‐established aerospace‐grade polymer with a history of use in various spacecraft composites and components 10,11 due to its low outgassing properties. It is widely used in many other engineering applications such as oil and gas for its excellent corrosion resistance and tribological properties 12–14 and in biomedical implants 15,16 for its biocompatibility. Although PEEK is challenging to process, it has been successfully 3D printed with different additive layer manufacturing techniques (i.e.…”

Section: Introductionmentioning

confidence: 99%

Fused filament fabrication of polyetheretherketone/multiwalled carbon nanotube nanocomposites: the effect of thermally conductive nanometric filler on the printability and related properties

Rinaldi

Ghidini

Nanni

2021

Polymer International

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Fused filament fabrication is an additive layer manufacturing technique. It was extensively used at the beginning for the manufacturing of prototypes, and it has been adopted during the last few years for the manufacturing of fully functional components. Polyetheretherketone (PEEK) has been thoroughly investigated as a composite matrix because of its outstanding mechanical properties and thermal and chemical stability. This study is focused on PEEK nanocomposites with different amounts of carbon nanotubes (CNTs) (i.e. 3, 5, 10 wt%) produced in the form of a filament and successively 3D printed. The influence of the CNT presence on printability was studied and correlated to the nanocomposite feedstock thermal and microstructural properties, defining a substrate temperature processability window. Interestingly the addition of CNTs significantly limits the processability window due to the influence on the crystallization process and viscosity. Moreover, the thermal and mechanical properties of 3D printed bulk samples were investigated in view of the PEEK/CNT nanocomposite feedstock properties. © 2021 Society of Chemical Industry

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PEEK -TiO2 composites with enhanced UV resistance

Cited by 34 publications

References 49 publications

A comparison of thermally conductive polyamide 6‐boron nitride composites produced via additive layer manufacturing and compression molding

A comparison of thermally conductive polyamide 6‐boron nitride composites produced via additive layer manufacturing and compression molding

Graphene nanoplatelet, multiwall carbon nanotube, and hybrid multiwall carbon nanotube–graphene nanoplatelet epoxy nanocomposites as strain sensing coatings

Fused filament fabrication of polyetheretherketone/multiwalled carbon nanotube nanocomposites: the effect of thermally conductive nanometric filler on the printability and related properties

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