A review on voids of 3D printed parts by fused filament fabrication

Journal of Materials Research and Technology, Journal Year: 2021, Volume and Issue: 15, P. 4860 - 4879

Published: Oct. 29, 2021

Fused filament fabrication (FFF), also known as fused deposition modeling (FDM™), is considered one of the most promising additive manufacturing (AM) methods for its versatility, reliability and affordability. First adopted by industries professional uses such rapid prototyping, then general public in recent years, FFF has gathered itself considerable attention. Nevertheless, despite key advancements printer technologies materials, robust, performing functional parts high-demanding practical applications remains a significant challenge. Due to intrinsic deficiencies, presence voids weak layer-to-layer adhesion, FFF-printed are plagued anisotropic mechanical properties contrast their conventionally manufactured counterparts. With increasing demand designable porous structures fields biomedicine, 4D printing lightweight cellular composites, understanding challenges presented void become more relevant than ever. As existing literature reviewed significance interlayer bonding, this review focuses on documenting insights formation categorization, research method mechanism. The primary objective provide comprehensive two current research—quantitative analysis imaging. Detailed discussions effects feedstock parameters presented. Lastly, discusses gaps outlines unaddressed regarding relation with performance parts.

Language: Английский

---

4D printing thermo-magneto-responsive PETG-Fe3O4 nanocomposites with enhanced shape memory effects

Applied Materials Today, Journal Year: 2024, Volume and Issue: 40, P. 102361 - 102361

Published: Aug. 3, 2024

In this groundbreaking study, Polyethylene Terephthalate Glycol (PETG)-Fe3O4 nanocomposites were developed for 4D printing, incorporating iron oxide (Fe3O4) nanoparticles into PETG matrix. The research contribution lies in its innovative approach to enhancing the shape memory effect (SME) through thermo-magnetic responsiveness, positioning PETG-Fe3O4 as a revolutionary material smart additive manufacturing. composites synthesized using melt mixing method, followed by 3D printing specimens comprehensive evaluation dynamic mechanical thermal analysis (DMTA), scanning electron microscopy (SEM), and uniaxial tensile tests. findings revealed that incorporation of Fe3O4 significantly boosts composites' storage modulus glass transition temperature, indicative improved stiffness properties. Notably, 15 % composite emerged optimal blend, exhibiting highest strength favourable balance between integrity flexibility. A key result was enhanced SME under both magnetic stimuli, with recovery efficiency speed escalating nanoparticle concentration. This advancement underscores potential fabricating structures capable environmental adaptability, paving way impacts biomedical, aerospace, robotic devices. Through work, new paradigm functionality has been established, demonstrating viability integration added capabilities.

Language: Английский

---

Advancing Plastic Recycling: Challenges and Opportunities in the Integration of 3D Printing and Distributed Recycling for a Circular Economy

Polymers, Journal Year: 2023, Volume and Issue: 15(19), P. 3881 - 3881

Published: Sept. 25, 2023

The concept of the circular economy has emerged as a promising solution to address mounting concerns surrounding plastic waste and urgent need for sustainable resource management. While conventional centralized recycling remains common practice waste, facilities may prove inadequate in handling ever-increasing volumes generated globally. Consequently, exploring alternative methods, such distributed by additive manufacturing, becomes paramount. This innovative approach encompasses actively involving communities practices promotes economy. comprehensive review paper aims explore critical aspects necessary realize potential manufacturing. In this paper, our focus lies on proposing schemes that leverage existing literature harness manufacturing an effective We intricacies process, optimize 3D printing parameters, challenges, evaluate mechanical properties recycled materials. Our investigation draws heavily from last five years, we conduct thorough assessment DRAM implementation its influence structures. Through analysis, reveal materials delivering functional components, with insights into their performance, strengths, weaknesses. serves guide those interested embracing transformative recycling. By fostering community engagement, optimizing processes, incorporating suitable additives, it is possible collectively contribute more future while combatting crisis. As progress made, essential further delve complexities material behavior, techniques, long-term durability printed components. addressing these challenges head-on, feasible refine advance viable pathway minimize cultivating cleaner planet generations come.

Language: Английский

---

Shape Memory Polymeric Materials for Biomedical Applications: An Update

Journal of Composites Science, Journal Year: 2023, Volume and Issue: 7(1), P. 24 - 24

Published: Jan. 10, 2023

Shape memory polymers (SMPs) are emerging smart materials that have the ability to change a shape and revert their permanent on application of external stimulus. SMPs can be divided into four types based shape, elasticity origin, temporary fixing mechanism: chemically cross-linked glassy thermosets, semi-crystalline, physically copolymers, block copolymers. The broad overview recent developments for biomedical applications proves wide applicability in field general medicine, drug delivery, regenerative dentistry, neuromedicine, cancer therapy, orthopedics, corrosion protection. Herein, comprehensive analysis composites with focus types, mechanism, functionality is presented. Relevant technologies future advancement towards also discussed.

Language: Английский

---

Sustainability of self-healing polymers: A holistic perspective towards circularity in polymer networks

Progress in Polymer Science, Journal Year: 2024, Volume and Issue: 152, P. 101816 - 101816

Published: March 26, 2024

Permanent polymer networks present an important sustainability challenge. Irreversible covalent crosslinks impart these materials excellent mechanical properties, thermal and chemical resistance, yet also render them difficult to repair recycle. Self-healing mechanisms can extend the lifetime of thermosets elastomers, improving their durability making lifecycle more sustainable. In addition extension, this paper reviews self-healing polymers from a holistic point view. The entire is critically assessed with reference green chemistry principles sustainable development. relation between chemistries aspects each phases are discussed, starting feedstocks, monomer functionalisation synthesis, processing manufacturing as well end-of-life considerations, i.e. recycling or (bio)degradation. review provides toolbox for development thermosets, elastomers composites. It utmost importance consider materials, derived products – by extension any material product. ability often related recyclability should primarily reduce amount new that necessary fulfill societal needs, extending maximizing reprocessing into products. Increasing healing efficiency number cycles improves overall environmental impact relative extended service lifetime. Renewable resources biomass, processes waste streams be first choice create polymers. Finally, biodegradability considered complementary scenario upon accidental loss environment, provided biodegradation does not start under prospected use conditions products, but postponed until contact stimuli in environment.

Language: Английский

---

Hybrid 3D printing of fluid-filled lattices for biomedical applications: a review

The International Journal of Advanced Manufacturing Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 28, 2025

Language: Английский

---

Effect of extrusion and fused filament fabrication processing parameters of recycled poly(ethylene terephthalate) on the crystallinity and mechanical properties

Additive manufacturing, Journal Year: 2021, Volume and Issue: 50, P. 102518 - 102518

Published: Nov. 27, 2021

Language: Английский

---

Recent advances in 3D printed cellulose-based wound dressings: A review on in vitro and in vivo achievements

Carbohydrate Polymers, Journal Year: 2023, Volume and Issue: 321, P. 121298 - 121298

Published: Aug. 14, 2023

Chronic wounds, especially diabetic ulcers, pose a significant challenge in regenerative medicine. Cellulose derivatives offer remarkable wound management properties, such as effective absorption and retention of exudates, maintaining an optimal moisture environment crucial for successful chronic regeneration. However, conventional dressings have limited efficacy managing healing these types skin lesions, driving scientists to explore innovative approaches. The emergence 3D printing has enabled personalized that meet individual patient needs, improving the process comfort. demanding requirements biocompatibility, printability, biofabrication necessary biologically active scaffolds. potential applications nanocellulose cellulose derivative-based inks regeneration remain largely unexplored. Thus, this review provides comprehensive overview recent advancements cellulose-based dressings. composition approaches are thoroughly discussed, including functionalization with bioactive molecules antibiotics improved Similarly, vitro vivo performance is extensively examined. In summary, aims highlight exceptional advantages diverse printed care.

Language: Английский

---

Fused Deposition Modelling (FDM) of Thermoplastic-Based Filaments: Process and Rheological Properties—An Overview

Materials, Journal Year: 2023, Volume and Issue: 16(24), P. 7664 - 7664

Published: Dec. 15, 2023

The fused deposition modeling (FDM) process, an extrusion-based 3D printing technology, enables the manufacture of complex geometrical elements. This technology employs diverse materials, including thermoplastic polymers and composites as well recycled resins to encourage sustainable growth. FDM is used in a variety industrial fields, automotive, biomedical, textiles, rapid prototyping method reduce costs shorten production time, or develop items with detailed designs high precision. main phases this include feeding solid filament into molten chamber, capillary flow non-Newtonian fluid through nozzle, layer on support base, layer-to-layer adhesion. viscoelastic properties processed materials are essential each steps: (i) predicting printability melted material during extrusion ensuring continuous across nozzle; (ii) controlling process print bed avoiding fast leakage loss precision molded part; (iii) adhesion subsequent consolidation phase. Regarding framework, work aimed collect knowledge different types rheological order forecast performance thermoplastics.

Language: Английский

---

Advancements in Functionally Graded Polyether Ether Ketone Components: Design, Manufacturing, and Characterisation Using a Modified 3D Printer

Polymers, Journal Year: 2023, Volume and Issue: 15(14), P. 2992 - 2992

Published: July 10, 2023

Functionally Graded Materials represent the next generation of engineering design for metal and plastic components. In this research, a specifically modified optimised 3D printer was used to manufacture functionally graded polyether ether ketone This paper details manufacturing methodologies in development capable producing materials through manipulation microstructure. The interaction individually deposited beads material during printing process investigated using scanning electron microscopy, observe quantify porosity levels interlayer bonding strength, which affects quality final parts. Specimens were produced under varying conditions tested characterise influence on resulting properties. specimens printed at high enclosure temperatures exhibited greater strength than parts without active addition heat, due improved bond formation between individual layers print large degree crystallinity maintenance these elevated temperatures.

Language: Английский

---