Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2

Shalom, Hila; Sui, XiaoMeng; Elianov, Olga; Brumfeld, Vlad; Rosentsveig, Rita; Pinkas, Iddo; Feldman, Yishay; Kampf, Nir; Wagner, H. Daniel; Lachman, Noa; Tenne, R.

doi:10.3390/lubricants7030028

Cited by 17 publications

(30 citation statements)

References 77 publications

(95 reference statements)

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“…The improved mechanical properties might also suggest better dispersion of the WS 2 INT by solvent-casting, countering the solvents-induced deterioration of the polymer matrix itself. As showed in previous work 15 , differences in dispersion can account to up to 50% difference in strength, 20% in modulus and 80% in toughness, as befitting the difference between printed and cast PLA/ WS 2 -NT. The difference in dispersion can also explain the large error range of the printed PLA/ WS 2 -NT wires.…”

Section: Resultssupporting

confidence: 57%

“…Transition between the pure matrix and the nanocomposite in printing are thus simple and straight-forward. Comparing the DSC results to those of solvent-cast PLA and PLA/ WS 2 -NT 15 shows that solvent-casting induces the highest degree of crystallinity, most likely due to the much slower process of solvent evaporation that allows for larger crystals to grow. It is worth noting that dedicated-for-printing off-the-shelf PLA can also reach over 30% crystallinity post-printing, so optimization of formulation might be helpful in achieving higher crystallinity for improved mechanical properties, or lower for faster degradation.…”

Section: Resultsmentioning

confidence: 99%

“…The mechanical properties of printed PLA and PLA-WS 2 -NT composite were also compared to those of solvent-cast films previously published 15 (Fig. 5 and Table 2).…”

Section: Resultsmentioning

confidence: 99%

“…Table 1. DSC parameters with standard deviation of PLA and PLA/ WS 2 -NT pre-and post-printed filament, compared to solvent-casted parameters 15 . Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the biodegradability of PLA, and the biocompatibility of WS 2 -NT, PLA/WS 2 -NT is a biodegradable nanocomposite. Reinforced PLA is used in biodegradable scaffolds for tissue engineering 3,9,14 , and previous work on PLA/WS 2 -NT 15 have demonstrated improved mechanical and rheological properties compared to that of pure PLA, with little change in the polymer viscosity. The preservation of viscosity together with the clear advantages of custom-tailored scaffolds and prostheses inspired a high motivation in adjusting PLA/WS 2 -NT composite for FFF.…”

mentioning

confidence: 99%

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Strong, tough and bio-degradable polymer-based 3D-ink for fused filament fabrication (FFF) using WS2 nanotubes

Shalom

Kapishnikov

Brumfeld

et al. 2020

Sci Rep

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WS 2 inorganic nanotubes (WS 2-NT) have been incorporated into Polylactic Acid (PLA) by melt mixing to create a biodegradable , mechanically reinforced nanocomposite filament. The filament was then processed by Fused Filament Fabrication (FFF) 3D-printer, and the morphology and characteristics before and after printing were compared. We found that addition of WS 2-NT to PLA by extrusion mixing increases the elastic modulus, yield strength and strain-at-failure by 20%, 23% and 35%, respectively. Moreover, we found that the printing process itself improves the dispersion of WS 2-NT within the PLA filament, and does not require changing of the printing parameters compared to pure PLA. The results demonstrate the advantage of WS 2-NT as reinforcement specifically in 3D-printable polymers, over more traditional nano-reinforcements such as graphene and carbon nanotubes. WS 2-nt based 3D-printable nanocomposites can be used for variety of applications from custom-made biodegradable scaffold of soft implants such as cartilage-based organs and biodegradable soft stents to the more general easy-to-apply nano-reinforced polymers. Advanced manufacturing, and especially 3D printing, has attracted a lot of attention in the last decades, mostly due to its high versatility in materials and designs-including topographies that cannot be produced in traditional subtractive manufacturing, and the ease of custom-tailoring products. The latter has enormous advantage in the medical fields-especially orthopedic, dental and plastic medicine, as it allows precise anatomical design of the printed device-be it an implant, a surgical tool or a support model-to the specific patient 1,2. The most widely used printing technique is the Fused Filament Fabrication (FFF) used to fabricate thermoplastics such as Polylactic Acid (PLA), Acrylonitrile Butadiene Styrene (ABS) and Polycarbonate (PC). In FFF, a thermoplastic filament is extruded through a heated nozzle onto a build platform as layer by layer are infused together to a final solid shape. The temperature of the extruding nozzle and build platform, as well as layer thickness, orientation, and printing speed can be tailored to control the properties of the final product. The use of thermoplastic polymers allows for fast, low-cost and relatively simple fabrication of lightweight structures, but the final product will be mechanically weak. Moreover, as the demand for multifunctional materials increases, the need for complex designs to optimize the use of such materials also rises 3-5. Polymer matrix composites, and especially nanocomposites, propose an elegant solution: the micro-and nano-additives will provide improved mechanical 6 , electrical 7 , and other desired properties, while the polymer matrix maintains ease of fabrication and lightweight structure. The choice of nanofillers and thus of properties is vast 4,8 , but the transition from a pure polymer to polymer nanocomposite is far from trivial. Issues such as adhesion, orientation and dispersion of the nanofillers within the final prod...

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

“…The mechanical properties of printed PLA and PLA-WS 2 -NT composite were also compared to those of solvent-cast films previously published 15 (Fig. 5 and Table 2).…”

Section: Resultsmentioning

confidence: 99%

“…Table 1. DSC parameters with standard deviation of PLA and PLA/ WS 2 -NT pre-and post-printed filament, compared to solvent-casted parameters 15 . Table 2.…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Strong, tough and bio-degradable polymer-based 3D-ink for fused filament fabrication (FFF) using WS2 nanotubes

Shalom

Kapishnikov

Brumfeld

et al. 2020

Sci Rep

Self Cite

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Nanotubes and fullerene‐like nanoparticles from layered transition metal dichalcogenides: Why do they form and what is their significance?

Sreedhara

Sinha

Zak

et al. 2022

Zeitschrift anorg allge chemie

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One‐dimensional (1D) analogues of two‐dimensional (2D) layered materials, especially nanotubes exhibit unique properties, which are distinct from the 2D flakes. The nanotubes and fullerene‐like nanoparticles from layered transition metal dichalcogenides (TMDs) are one of the prime foci of this field in the last 30 years. In this concise review, we present the advancement made in the TMDs nanotubes and fullerene‐like nanoparticles over the last few years. The synthesis and structure of TMDs nanotubes such as WS2/MoS2 are briefly described. The mechanical properties of single WS2 nanotubes were examined by in‐situ electron microscopy techniques and are briefly discussed. Their reinforcement effects in polymer composites are also presented, as well as their superior tribological behavior. The unique optoelectronic properties of WS2 (MoS2) nanotubes are presented. Thus, the bulk photovoltaic effect and superconductivity exhibited by WS2 nanotubes, which are a manifestation of their 1D structure and low symmetry, are revisited briefly. The strong light‐matter interaction of nanotubes resulting in polariton quasiparticles and their evolution as a function of nanotube diameter are explained. Last but not least, a new family of misfit layered nanotubes and their exceptional physical properties are briefly touched upon.

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Heterogeneous nucleation of polyethylene crystals on binary hexagonal nanoplatelets

Volchko,

Rutledge

2024

J Mater Sci

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Crystal nucleating agents offer an effective strategy for controlling the morphology, dimensional stability and rate of solidification of polymers during processing. Molecular dynamics (MD) simulation can shed light on nucleation behavior at the nanoscopic length and time scales over which nucleation occurs. In this work, crystal nucleation of a polyethylene oligomer, n-pentacontane, on three graphene-like substrates, hexagonal boron nitride (hBN), molybdenum disulfide (MoS2), and tungsten disulfide (WS2), was simulated, and the thermodynamic efficiencies of these substrates as nucleating agents were determined. Experimental measurements of heterogeneous nucleation of a high-density polyethylene on nanoparticles of these three graphene-like materials were performed using the method of dispersed microdroplets in an immiscible polystyrene matrix. Qualitative agreement between simulations and experiments was observed for trends in nucleation rate, J, and interfacial free energy difference, Δσ, with $$J_{\text{hBN}} > J_{\text{MoS}_{2}} > J_{\text{WS}_{2}}$$ J hBN > J MoS 2 > J WS 2 . The simulations are then used to gain additional insight into the mechanisms of nucleation. Epitaxy is confirmed in all systems, with small mismatches in lattice spacing being accommodated by strain in the oligomer crystal. However, epitaxy alone is insufficient to explain the observed trends. The strength of interaction between the nucleating agent and the polyethylene oligomer is found to be the strongest predictor of nucleating agent efficiency. The strength of interaction is in turn related to the density of interaction sites at the interface: hBN has the highest density, and thus the fastest nucleation rate.

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Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2

Cited by 17 publications

References 77 publications

Strong, tough and bio-degradable polymer-based 3D-ink for fused filament fabrication (FFF) using WS2 nanotubes

Strong, tough and bio-degradable polymer-based 3D-ink for fused filament fabrication (FFF) using WS2 nanotubes

Nanotubes and fullerene‐like nanoparticles from layered transition metal dichalcogenides: Why do they form and what is their significance?

Heterogeneous nucleation of polyethylene crystals on binary hexagonal nanoplatelets

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