Covalently modified graphene and 3D thermally conductive network for PEEK composites with electromagnetic shielding performance

Composites Part A Applied Science and Manufacturing, Journal Year: 2023, Volume and Issue: 173, P. 107633 - 107633

Published: May 27, 2023

Language: Английский

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Interlayer bonding improvement of PEEK and CF-PEEK composites with laser-assisted fused deposition modeling

Composites Communications, Journal Year: 2024, Volume and Issue: 45, P. 101819 - 101819

Published: Jan. 1, 2024

Language: Английский

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Short fiber reinforcement in material extrusion 3D printing: A meta‐analysis review with insights into sustainable alternatives

Polymer Composites, Journal Year: 2025, Volume and Issue: unknown

Published: April 4, 2025

Abstract Short fiber reinforcement is a key for improving the mechanical properties of thermoplastic composites produced by 3D printing. However, strengthening potential fibers often under‐utilized due to sub‐optimal processing conditions. This meta‐analysis review systematically evaluates microstructural and short fiber‐reinforced composites, identifying trends related fragmentation, fiber‐matrix interactions, property optimization. Our statistical analysis results show that content initial length have minimal effect on average remaining in filament, which highlights conditions are primary control breakage. In addition, aspect ratio does not direct correlation with tensile strength, can be insufficient adhesion. Despite these drawbacks, still increase modulus an 2.22 times flexural 2.69 times. Analytical models predicting also presented, noting while they provide valuable insights, time‐consuming experimental validation required accurate estimates. Finally, we insights into sustainable waste‐derived fillers as alternatives conventional fibers. Although their performance remains less predictable, surface treatment strategies advanced multi‐scale modeling techniques will essential establish structure–property relationships exploit fully. Ultimately, hold significant promise replacing raw material from sources, paving way more composite Highlights Waste‐derived emerging 3D‐printed composites. Improved micromechanical needed predict effects waste fillers. Statistical shows strength independent ratio. Filler affect fragmentation during filament manufacturing.

Language: Английский

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Facilitating the additive manufacture of high-performance polymers through polymer blending: A review

European Polymer Journal, Journal Year: 2023, Volume and Issue: 201, P. 112553 - 112553

Published: Nov. 7, 2023

Fused Filament Fabrication (FFF, a.k.a. fused deposition modeling, FDM) is presently the most widespread material extrusion (MEX) additive manufacturing technique owing to its flexibility and robustness. Nonetheless, it remains underutilized in load-bearing applications, as often seen aerospace, automotive biomedical industries. This largely due processing challenges associated with high performance polymers (HPPs) like poly-ether-ether-ketone (PEEK) or polyetherimide (PEI). Compared commercial-grade plastics such polylactic acid (PLA), parts produced HPPs have outstanding mechanical properties thermal stability. However, bulkier chemical structures stronger intermolecular forces than common FFF feedstock materials, this results much higher printing temperatures greater melt viscosities. The demanding requirements of thus impaired their adoption within FFF. Polymer blending, which consists properly mixing other thermoplastics, makes possible alleviate these issues, while also providing additional advantages improved tensile strength reduced friction. Further this, manipulating crystallisation processes mitigates distortion warping upon printing. review explores some emerging trends field HPP blends how they address excessive viscosity, polymer crystallization, moisture uptake, part shrinkage 3D Also, various structural/mechanical/chemical enhancements that are afforded through blending critically analysed based on recent examples from literature. Such insights will not only aid researchers field, but facilitate development novel, printable blends.

Language: Английский

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Enhanced mechanical and tribological properties of 3D printed short carbon fiber reinforced polyether ether ketone composites

Polymer Composites, Journal Year: 2024, Volume and Issue: unknown

Published: March 30, 2024

Abstract Material extrusion additive manufacturing provides an effective solution for fabrication of highly customized polyether ether ketone (PEEK) composite parts with any complex shape. Nevertheless, compared conventional methods, the mechanical strength 3D printed carbon fiber reinforced PEEK (CF/PEEK) composites is unsatisfactory due to weak interface bonding and high voids content induced by temperature difference. To overcome this challenge, a temperature‐control printer was used investigate effects ambient annealing on microstructure, crystallization behavior properties parts. Moreover, tribological at different were also studied under various contact pressure. Experimental results showed that treatment directly affected interfacial (fiber/matrix, filament/filament, layer/layer), crystallinity samples, thus affecting their properties. The CF/PEEK 200°C exhibited outstanding This study has positive significance promoting application in field structural load‐bearing friction materials. Highlights Structure–property relationships composites. strongly affects thermal microstructural Interaction between molecular diffusion. Interfacial determine Tribological are dependent applied pressures.

Language: Английский

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Increasing the isotropy of 3D printed poly(ether ether ketone) using a combination of bimodal polymer blends and post-process thermal annealing

Additive manufacturing, Journal Year: 2024, Volume and Issue: 84, P. 104127 - 104127

Published: March 1, 2024

Language: Английский

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Slowing crystallization to enhance interlayer strength of 3D printed poly (ether ether ketone) parts by molecular design

Additive manufacturing, Journal Year: 2022, Volume and Issue: 59, P. 103104 - 103104

Published: Aug. 23, 2022

Language: Английский

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Experimental and numerical investigations of the fracture in 3D-printed open-hole plates

Theoretical and Applied Fracture Mechanics, Journal Year: 2022, Volume and Issue: 121, P. 103543 - 103543

Published: Aug. 17, 2022

Language: Английский

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Integrated modeling of heat transfer, shear rate, and viscosity for simulation-based characterization of polymer coalescence during material extrusion

Journal of Manufacturing Processes, Journal Year: 2023, Volume and Issue: 90, P. 443 - 459

Published: Feb. 22, 2023

The material extrusion process (MEX), also known as the fused filament fabrication process, has attracted attention in manufacturing industry. A major obstacle to further application of technology is lack mechanical strength due weak interlayer and poor coalescence between adjacent beads. Understanding effect printing parameters on beads a step toward improvement process. In this study, novel two-phase flow numerical simulation approach coupled with heat transfer been applied high-viscosity polymers determine MEX influence temperature, substrate temperature chamber, well deposition strategy (unidirectional bidirectional) beads, investigated by validated experimental study. modeling Glycerol, Polyether ether ketone (PEEK) Polylactic acid (PLA). results show that increasing points (substrate chamber temperature), increase model reveals cooling rate deposited bead relatively high, hence, time window for reaching beads/layers short. indicates layers does not coalescence. bidirectional higher compared unidirectional all conditions remaining similar. Unidirectional leads uniform However, deposition. main novelty research simultaneously transfer, shear study Since time-consuming, two empirical equations based obtained have proposed predict PLA PEEK separately.

Language: Английский

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Toward 4D Printing of Shape Memory Polymers Based on Polyaryletherketone/NVP/PEGDA through Molecular Engineering and Direct Ink Writing 3D Printing

ACS Applied Polymer Materials, Journal Year: 2023, Volume and Issue: 5(11), P. 8833 - 8844

Published: Oct. 26, 2023

Polyaryletherketone (PAEK), an engineering plastic with exceptional mechanical properties and a high glass transition temperature, can be tailored various to meet the multiple requirements of aerospace applications. However, it remains challenge 3D print PAEK good properties. Herein, direct ink writing (DIW) printable has been developed, yielded parts possess tensile strength excellent shape memory The incorporation N-vinyl-2-pyrrolidone (NVP) polyethylene glycol diacrylate PEGDA into oligomers (PAEKOs) facilitated their versatility as diluents or reactive functional monomers. This characteristic enabled random cross-linking through photoinitiator exposure for formation block copolymers, establishing essential stationary reversible phases needed capabilities. photocured demonstrated comprehension performances, including outstanding (42.6 MPa), thermal stability (Td-246 °C), fixation ratio (>93%), recovery (>100%). Furthermore, greater effect was utilized actuator realize gripping releasing at temperatures (140 °C). study therefore provides emerging strategy fabricate components challenging environments using DIW technology. approach also holds promise implementation in systems beyond which have typically difficult print.

Language: Английский

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