Molybdenum disulfide as a filler for a polymeric matrix at an ultralow content: Polystyrene case

Rodriguez, Camila Laura Celis; Nunes, Mário A. B. S.; Garcia, Pâmela S.; Fechine, Guilhermino J. M.

doi:10.1016/j.polymertesting.2020.106882

Cited by 20 publications

(5 citation statements)

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“…The behavior of nanocomposites in the face of accelerated degradation indicates that the deactivation of radical intermediates by MoS 2 delayed the scissions reactions of the PS, generating fewer carbonyl groups and conjugated double bounds, as there were fewer reactive species available in the photodegradation medium. In the same way, these compositions were also sufficient to improve the mechanical properties [34].…”

Section: Molecular Weight Analysismentioning

confidence: 82%

“…The present work aims to investigate, for the first time, the effect of very low content of molybdenum disulfide on the photodegradation process of polystyrene when exposed to controlled accelerated weathering. The samples used herein were obtained from the study of Rodrigues [34]. The films were analyzed by UV-vis spectroscopy, infrared spectroscopy (FTIR), and size exclusion chromatography (SEC).…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The two-dimensional particles had a lateral size of 0.1-0.2 µm with a 2.5-10.0 nm thickness, indicating ≤5 layers, and were obtained using liquid-phase exfoliation (LFE). The exfoliation procedures and characterization of the obtained MoS 2 were already described in a previous work [34,41].…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

“…The results of Rodriguez et al recently showed that very low contents of MoS 2 (0.001-0.005 wt%) added to polystyrene (PS) improved the mechanical properties. When 0.002 wt% of MoS 2 is added to PS, tensile strength values increase by 18%, elongation at break increases by 31%, toughness increases by 57%, and Young's modulus showed a small decrease in PS stiffness, around 11% [34]. In respect to thermal stability, the thermogravimetric analysis (TGA) highlighted that the presence of MoS 2 particles induces an increase around 10 • C in the initial weight loss temperature, despite the temperatures corresponding to the advance of the mass loss process not changing.…”

Section: Introductionmentioning

confidence: 99%

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Photooxidative Behavior of Polystyrene Nanocomposites Filled with Two-Dimensional Molybdenum Disulfide

2023

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This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS2) two-dimensional particle affects the photodegradation mechanism of polystyrene (PS). Here, an accelerated weathering study was presented on neat polystyrene and its nanocomposites produced with 0.001, 0.002, 0.003 and 0.005 wt% of molybdenum disulfide (MoS2) exposed for various irradiation intervals (up to 8 weeks). The polymer photo-transformations were monitored using size exclusion chromatography (SEC), infrared spectroscopy (FTIR), and UV-Vis spectroscopy. The FTIR and UV/Vis results indicate that the PS degradation mechanism was not altered by the presence of MoS2 particles; however, the degradation reactions were slowed down at higher MoS2 contents (>0.003%). The SEC results proved the stabilizer effect due to MoS2 particles, where M¯n, M¯w, and M¯w/M¯n values after 8 weeks were less modified when compared with the neat PS results. The MoS2 acted as a UV stabilizer, and these two-dimensional particles acted by deactivating the free radicals generated by the PS matrix, even considering the low amount of the filler (<0.005 wt%).

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Section: Molecular Weight Analysismentioning

confidence: 82%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Materials and Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photooxidative Behavior of Polystyrene Nanocomposites Filled with Two-Dimensional Molybdenum Disulfide

2023

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“…Benchouia et al [ 18 ] prepared polystyrene/date surface fiber composites by melt blending and thermo-compression molding methods and the thermomechanical and compressive strength tests were carried out on the prepared composites, which showed that the incorporation of date surface fibers improves the thermal stability of the PS matrix, and the composites exhibit higher compressive strengths as compared to pure PS. Rodriguez et al [ 19 ] utilized the high specific surface area of molybdenum disulfide to fabricate a polystyrene/molybde-num disulfide composite through a melt mixing process. The incorporation of 0.002 wt% molybdenum disulfide resulted in a remarkable enhancement in the tensile strength of polystyrene by 27.5%, fracture elongation by 93.7%, and toughness by 100%.…”

Section: Introductionmentioning

confidence: 99%

Process Study of Selective Laser Sintering of PS/GF/HGM Composites

Liu,

Zhu,

Zhang

et al. 2024

Materials

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To address the issues of insufficient strength and poor precision in polystyrene forming parts during the selective laser sintering process, a ternary composite of polystyrene/glass fiber/hollow glass microbeads was prepared through co-modification by incorporating glass fiber and hollow glass microbeads into polystyrene using a mechanical mixing method. The bending strength and dimensional accuracy of the sintered composites were investigated by conducting an orthogonal test and analysis of variance to study the effects of laser power, scanning speed, scanning spacing, and delamination thickness. The process parameters were optimized and selected to determine the optimal combination. The results demonstrated that when considering bending strength and Z-dimensional accuracy as evaluation criteria for terpolymer sintered parts, the optimum process parameters are as follows: laser power of 24 W, scanning speed of 1600 mm/s, scanning spacing of 0.24 mm, and delamination thickness of 0.22 mm. Under these optimal process parameters, the bending strength of sintered parts reaches 6.12 MPa with a relative error in the Z-dimension of only 0.87%. The bending strength of pure polystyrene sintered parts is enhanced by 15.69% under the same conditions, while the relative error in the Z-dimension is reduced by 63.45%. It improves the forming strength and precision of polystyrene in the selective laser sintering process and achieves the effect of enhancement and modification, which provides a reference and a new direction for exploring polystyrene-based high-performance composites and expands the application scope of selective laser sintering technology.

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Enhanced thermally conductive TPU/graphene filaments for 3D printing produced by melt compounding

Maldonado

Pinto

Costa

et al. 2022

J of Applied Polymer Sci

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Conducting polymers are a potential solution to the issue of wide-range manufacture of flexible electronics, since many polymers are suitable to advanced fabrication methods, such as fused deposition modeling (FDM) 3D printing.Therefore, it is proposed in this work a ductile thermoplastic polyurethane (TPU)/graphene nanocomposite with enhanced thermal conductivity that would be suitable for additive manufacturing processes. The nanocomposites were produced by melt compounding technique, which does not require the use of toxic solvents and is characteristic of being used by the thermoplastic industry. The filaments were then analyzed in terms of graphene dispersion, microstructural changes, mechanical behavior, and thermal conductivity. It was verified that graphene does not have a good interaction with the TPU matrix, presenting voids at the interface and forming agglomerates at higher contents. However, it was able to affect the TPU's hard segments organization, leading to a more ordered structure up to 1.0 wt%. Consequently, the thermal conductivity was enhanced up to the graphene concentration by about 14% in relation to neat TPU. Additionally, even though the system presented a poor interface, no mechanical properties were lost, that is, the composite remained ductile even after graphene insertion, which is extremely interesting for additive manufacturing processes.

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Molybdenum disulfide as a filler for a polymeric matrix at an ultralow content: Polystyrene case

Cited by 20 publications

References 50 publications

Photooxidative Behavior of Polystyrene Nanocomposites Filled with Two-Dimensional Molybdenum Disulfide

Photooxidative Behavior of Polystyrene Nanocomposites Filled with Two-Dimensional Molybdenum Disulfide

Process Study of Selective Laser Sintering of PS/GF/HGM Composites

Enhanced thermally conductive TPU/graphene filaments for 3D printing produced by melt compounding

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