Nanostructured oxyhydroxide niobium (NbO<sub>2</sub>OH) as UV radiation protector for polypropylene

Souza, Sâmara D.; Pereira, Iaci Miranda; Rodrigues, Ana Pacheli Heitmann; Oliveira, Luiz C.A.; Boaventura, Túlio Pacheco; Souza, Alexandre R.; Oréfice, Rodrigo Lambert; Patrício, Pedro

doi:10.1039/c5ra08514d

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…This result can be justified by the presence of tailings acting as a nucleating agent, providing the fastest crystallization from the melt. Smaller crystals are formed, although the crystal structure is preserved 24 . Moreover, the tendency of a decrease in the crystallinity index corroborates as a nucleating agent of the fillers.…”

Section: Resultsmentioning

confidence: 99%

Use of iron mine tailing as fillers to polyethylene

Coura

Carmignano

Heitmann

et al. 2021

Sci Rep

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The iron mine tailings accumulation in dams is an environmental and economic problem. The composite based on high-density polyethylene/iron mine tailing production for the application of wood plastic and some items of domestic plastic industry can be a good alternative to reduce the rejects in the environment. This work presents the influence of the processing methodology in the mechanical, thermal and morphological properties of composites based on the high-density polyethylene/iron mine tailing. Four methodology processing by continuous and/or batch mixing were available. The iron mine tailing particles in the polymer matrix promoted an increase in mechanical strength and thermal stability. Besides, the particles acted as flame retardant. The iron mine tailing materials produced using batch mixing showed more significant modifications in the properties due to the better dispersion of the filler as shown by scanning electron microscopy.

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Section: Resultsmentioning

confidence: 99%

Use of iron mine tailing as fillers to polyethylene

Coura

Carmignano

Heitmann

et al. 2021

Sci Rep

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“…The double peak could also be explained by the existence of two crystalline phases, α and β, of PP. Because the α phase was less thermally stable than the β phase, it melted at lower temperatures …”

Section: Resultsmentioning

confidence: 99%

Prodegradant effect of titanium dioxide nanoparticulates on polypropylene–polyhydroxybutyrate blends

Fonseca

Patrício

Souza

et al. 2018

J of Applied Polymer Sci

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Polymers are gradually replacing conventional materials in various sectors of the economy because of their low cost and broad functionality. However, the high stability of polymers under most environmental conditions can lead to their accumulation in the form of waste. Polyhydroxybutyrate (PHB) is an alternative because of its biodegradability, but it is usually expensive and brittle. These aspects can be improved through the formation of blends, such as with polypropylene (PP). The objective of this study was to investigate the possibility of using titanium dioxide (TiO2) nanoparticles as a prodegradant agent in the PP–PHB–TiO2 system through the evaluation of the effects of these nanoparticles under UV light on the structure and properties of the materials. Samples were produced through extrusion and injection molding and were characterized by their mechanical and thermal properties and structural analyses. The results show that the TiO2 nanoparticles were able to act as a prodegradant agent for the PP–PHB blend; they also successfully improved some of the mechanical and dynamic mechanical properties of the blend. However, a TiO2 nanoparticle content higher than 7.5 wt % was not able to extend the photodegradation process further, possibly as a consequence of the agglomeration of nanoparticles during the processing of these more concentrated blends. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46636.

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Effect of molecular structures on static and dynamic compression properties of clay and amphiphilic clay/carbon nanofibers used as fillers in UHMWPE/composites for high‐energy‐impact loading

Dias

Lavoratti

Piazza

et al. 2018

J of Applied Polymer Sci

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Three different ultrahigh‐molecular‐weight polyethylene (UHMWPE)–clay nanocomposites (Muscovite, Cloisite 30B and amphiphilic clay/carbon nanofibers) were investigated with the nanocomposite nanomorphology studied before and after dynamic mechanical compressive tests at high strain rates. Their material structure and thermal properties were investigated using techniques such as step‐scan differential scanning calorimetry, split Hopkinson pressure bar, synchrotron small angle X‐ray scattering (SAXS), and dynamic mechanical analysis. Results were associated with morphological changes observed after deformation. chemical vapor deposition (CVD)‐modified nanocomposite, due to the molecular bonding and the extra functional groups, is designed with crystalline structures with fewer defects and higher stability. The increase in particulate/polymer interactions observed for the CVD‐modified material decreased the elongation in the quasi‐static test. However, the dynamic mechanical behavior contradicted the quasi‐static behavior because at very high strain rates there was not sufficient time for the interlamellar and intralamellar defect facilitated plastic flow and the material transitioned through the glassy state. The SAXS results show that deformation strongly induced changes in the UHMWPE and UHMWPE–clay nanocomposite morphology. SAXS indicates that CVD‐modified samples became more compact and dense, thus corroborating the formation of additional secondary bonds between structures and/or the carbon nanofibers alignment. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47094.

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Nanostructured oxyhydroxide niobium (NbO₂OH) as UV radiation protector for polypropylene

Abstract: In this study a novel approach for improving the photo-stabilization of polymers by incorporation of nanoparticles of a new niobium compound is reported.

Cited by 5 publications

References 30 publications

Use of iron mine tailing as fillers to polyethylene

Use of iron mine tailing as fillers to polyethylene

Prodegradant effect of titanium dioxide nanoparticulates on polypropylene–polyhydroxybutyrate blends

Effect of molecular structures on static and dynamic compression properties of clay and amphiphilic clay/carbon nanofibers used as fillers in UHMWPE/composites for high‐energy‐impact loading

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Nanostructured oxyhydroxide niobium (NbO2OH) as UV radiation protector for polypropylene

Abstract: In this study a novel approach for improving the photo-stabilization of polymers by incorporation of nanoparticles of a new niobium compound is reported.

Cited by 5 publications

References 30 publications

Use of iron mine tailing as fillers to polyethylene

Use of iron mine tailing as fillers to polyethylene

Prodegradant effect of titanium dioxide nanoparticulates on polypropylene–polyhydroxybutyrate blends

Effect of molecular structures on static and dynamic compression properties of clay and amphiphilic clay/carbon nanofibers used as fillers in UHMWPE/composites for high‐energy‐impact loading

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Product

Resources

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Nanostructured oxyhydroxide niobium (NbO₂OH) as UV radiation protector for polypropylene