Experimental and simulation studies of hybrid <scp>MWCNT</scp>/montmorillonite reinforced <scp>FDM</scp> based <scp>PLA</scp> filaments with multifunctional properties enhancement

Yohannan, Alex; Vincent, Sumi; Divakaran, Nidhin; Pottikadavath Venugopal, Ajay Kumar; Patra, Swagata; Ashish, Kommaji; Mohanty, Smita

doi:10.1002/pc.27794

Cited by 5 publications

(1 citation statement)

References 43 publications

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“…Conversely, the most extended and accessible AM technique, known as fused deposition modeling (FDM), uses a polymer material. This method is gaining more and more attention as these polymeric materials can incorporate multiple types of fillers 28–32 to provide some type of functionality to the built parts (e.g., electrical, 33,34 magnetic, 35–38 optical 39,40 ) or an improved mechanical resistance 41,42 while preserving the manufacturing advantages. The low melting temperatures of typical polymers prevent the modification of the properties of the magnetocaloric fillers during fabrication and printing 43,44 .…”

Section: Introductionmentioning

confidence: 99%

Polymer‐based filaments with embedded magnetocaloric Ni‐Mn‐Ga Heusler alloy particles for additive manufacturing

Díaz‐García,

Law,

Żrodowski

et al. 2024

Polymer Composites

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One important issue associated to magnetocaloric materials that hinders its technological application is the poor processability and structural integrity of those with the highest performance, usually intermetallics undergoing first‐order magnetic phase transitions. Additionally, the performance of these magnetocaloric materials highly depends on the structural stability of the magnetocaloric phase, which is, in many cases, very sensitive to temperature and mechanical processes. Additive manufacturing via the extrusion of polymer‐based composites is regarded as a promising way to overcome these issues. A recently presented manufacturing method of encapsulating functional fillers into polymer capsules has been used to produce a composite filament with a large load of magnetocaloric off‐stoichiometric Ni2MnGa Heusler alloy fillers with a uniform distribution throughout the polymer matrix as demonstrated by x‐ray tomography characterization. The incorporation of these metallic particles causes changes in the thermal behavior of the polymer as well as an increase in the flowability of the composite with respect to the polymer at the same temperature. The increased flowability of the composites found during manufacturing can be compensated by lowering the extrusion temperatures, making this technique even more convenient for preserving the filler properties, which is an important concern when additive manufacturing magnetocaloric materials. This is confirmed by the magnetic and magnetocaloric behavior of the composites, with responses proportional to the fraction of fillers.Highlights Ultrasonic‐atomization produces highly spherical Ni‐Mn‐Ga Heusler alloy particles. Ni‐Mn‐Ga filled polymer capsules allow a direct extrusion of composites for AM. X‐ray tomography shows uniform volumetric filler distribution within the filaments. Decreased viscosity of the matrix favors the lowering of the processing temperature. The low processing temperatures avoid altering the MCE of the alloy fillers.

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Section: Introductionmentioning

confidence: 99%

Polymer‐based filaments with embedded magnetocaloric Ni‐Mn‐Ga Heusler alloy particles for additive manufacturing

Díaz‐García,

Law,

Żrodowski

et al. 2024

Polymer Composites

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Amino‐functionalized nano‐hydroxyapatite boosts the grafting efficiency of poly (l‐lactic acid) to enhance interfacial bonding in composite bone scaffold

Yang,

Fan,

Qiu

et al. 2024

Polymer Composites

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Nano‐hydroxyapatite (nano‐HAP)/poly (l‐lactic acid) (PLLA) bone scaffold is expected to overcome the deficiencies and achieve the complementary advantages of individual constituents, but the weak interfacial bonding due to their thermodynamic incompatibility is detrimental to the mechanical properties. Herein, the PLLA chains were grafted onto nano‐HAP with 3‐aminopropyltriethoxysilane (KH550) as a coupling reagent to enhance the interfacial bonding with PLLA. Specifically, the silicon hydroxyl group produced by KH550 hydrolysis could form covalent bonding with the hydroxyl group of nano‐HAP, and the amino group of KH550 initiated the ring‐opening polymerization of l‐lactide monomers to graft PLLA chains onto nano‐HAP more effectively, leading to a higher grafting ratio of 16.7% compared with 7.2% in direct grafting without KH550 modification. Consequently, the tensile and compressive strength of the modified nano‐HAP/PLLA scaffold were improved by 40.8% and 59.5% enhancement due to the enhanced interfacial bonding in the composite scaffold, respectively, compared to the original nano‐HAP/PLLA scaffold. Additionally, the bone scaffold was conducive to cell adhesion and proliferation, making it an ideal candidate for bone defect repair.Highlights Amino‐functionalized nano‐HAP boosted the grafting efficiency of PLLA chains. Interfacial bonding between nano‐HAP and matrix was enhanced. Bone scaffold showed better mechanical properties and benign cytocompatibility.

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Fabrication of a packaging film based on PLA blends: The evolution of physical, mechanical, and rheological properties

Attari,

Molla‐Abbasi,

Rashidzadeh

2024

Polymer Engineering & Sci

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Today, the use of biodegradable polymers has become widespread in a wide range of industries. This research scrutinized the physical, mechanical, and rheological properties of poly (lactic acid)/poly (ethylene oxide)/carbon nanotube (PLA/PEO/CNTs) blend nanocomposites, as a good candidate for usage in the packaging industry. PEO and CNTs were added at various concentrations to improve the flexibility, toughness, gas permeability, thermal stability, and mechanical properties of PLA via solution blending. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Field Emission Scanning Electron Microscope (FESEM), water contact angle (WCA), rheometric mechanical spectrometer (RMS) test, gas permeability, and tensile characterization were performed to characterize the properties of the prepared blends and nanocomposites. The experimental results revealed that the addition of 25 wt% PEO to the PLA matrix made a partially miscible blend with a droplet‐matrix morphology. PEO at this concentration increased the elongation at break (from 2.2% to 18%) while reducing the modulus (from 25 to 6 MPa). Also, the experimental results indicated that the miscibility of PLA and PEO was enhanced by the addition of 1 wt% CNTs to the prepared blend, associated with diminished entropy of mixing in the LCST phase diagram. Theoretical calculations predicted that the CNTs would be localized in the PLA phase which increased the total crystallinity of the sample by 28%, considerably reducing the amount of gas permeation into the nanocomposite. In addition, the introduction of the CNTs to the blend increased the elongation at break and tensile strength by 13% compared to pure PLA and lowered the rate of thermal degradation effectively. Also, the final results showed that the COOH‐CNTs located in the PEO phase caused a decline in the crystallinity and an increase in the gas permeability of the prepared nanocomposite.Highlights Improvement of physical properties of PLA by blending with PEO and CNTs. A deep investigation on rheological behavior of the prepared nanocomposite. Increasing the crystallinity degree of PLA/PEO blend by adding CNTs. Improvement of the miscibility between PLA and PEO in the presence of CNTs. Controlling the CNTs localization by surface modification.

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Experimental and simulation studies of hybrid MWCNT/montmorillonite reinforced FDM based PLA filaments with multifunctional properties enhancement

Cited by 5 publications

References 43 publications

Polymer‐based filaments with embedded magnetocaloric Ni‐Mn‐Ga Heusler alloy particles for additive manufacturing

Polymer‐based filaments with embedded magnetocaloric Ni‐Mn‐Ga Heusler alloy particles for additive manufacturing

Amino‐functionalized nano‐hydroxyapatite boosts the grafting efficiency of poly (l‐lactic acid) to enhance interfacial bonding in composite bone scaffold

Fabrication of a packaging film based on PLA blends: The evolution of physical, mechanical, and rheological properties

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