Influence of the dispersing agents to obtain polymer–clay nanocomposites processed in two-steps using thermokinetic mixer

Bischoff, Eveline; Simon, Douglas Alexandre; Liberman, Susana Alcira; Mauler, Raquel Santos

doi:10.1007/s10853-020-04443-7

Cited by 5 publications

(3 citation statements)

References 53 publications

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“…However, the most significant increases occurred when the dispersing agent was used. 44 Zdiri et al studied the effect of Tunisian clay modified with trimethyloctadecylammonium bromide (HDTMA) on the properties of PP post-consumer nanocomposites incorporated with a maleic anhydride modified PP (PP-gMA) as a compatibilizer. The authors revealed an increase in PP thermal stability.…”

Section: Wide-angle X-ray Diffraction (Waxd)mentioning

confidence: 99%

Nano lamellar zirconium phosphate and screw speed changing properties of melt extrusion polypropylene nanocomposites

Mariano

Freitas

Mendes

2021

Journal of Composite Materials

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Tetravalent metal phosphates find application mainly as a catalyst and ionic exchangers besides structural and some other properties. In this study, pristine zirconium phosphate (ZrP) and chemically modified with Jeffamine™ (variable amine:phosphate ratio) were used as fillers to yield polypropylene nanocomposites by melt extrusion. Additionally, two different screw speeds (60 and 120 rpm) were carried out. Structural, crystallographic, thermal, dynamic-mechanical, and relaxometry properties were assessed. The morphology was also noticed. Wide-angle X-ray diffraction revealed that high speed and chemical modified ZrP led to the mixing of intercalated and exfoliated microstructures. Screw speed (60 rpm) and zirconium phosphate promoted a slight increase of thermal stability. Crystallization temperature and crystallinity degree were strongly influenced by screw speed and zirconium phosphate. Hydrogen nuclear magnetic resonance in the time domain endorsed the existence of polymer/filler interaction. Both screw speed and zirconium phosphate induced changes in glass transition temperature and moduli (storage and loss). Scanning electron microscopy images corroborated the polymer/filler interaction due to the low level of micro void and filler detachment. Crystallographic, thermal, calorimetric, relaxometry and morphologic evaluations endorsed the better effect of high screw speed and good interaction between polypropylene and phosphate.

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Section: Wide-angle X-ray Diffraction (Waxd)mentioning

confidence: 99%

Nano lamellar zirconium phosphate and screw speed changing properties of melt extrusion polypropylene nanocomposites

Mariano

Freitas

Mendes

2021

Journal of Composite Materials

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“…Epoxy resins find many industrial applications [ 6 , 7 ] and are particularly suitable for preparing nanocomposites with layered silicates due to the polarity of the epoxy monomers which can favor the compatibilization with the silicates and diffuse easily into the clay cavities [ 8 , 9 , 10 , 11 ]. In fact, the level of dispersion of the filler in the matrix is one of the crucial parameters to determine any enhancement of the properties of the nanocomposites [ 12 , 13 , 14 ] and is related to the nature of the curing agent, as well as the curing conditions and the dispersion procedure.…”

Section: Introductionmentioning

confidence: 99%

Chemical and Mechanical Characterization of Unprecedented Transparent Epoxy–Nanomica Composites—New Model Insights for Mechanical Properties

et al. 2023

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Two nanomicas of similar composition, containing muscovite and quartz, but with different particle size distributions, have been used to prepare transparent epoxy nanocomposites. Their homogeneous dispersion, due to the nano-size, was achieved even without being organically modified, and no aggregation of the nanoparticles was observed, thus maximizing the specific interface between matrix and nanofiller. No exfoliation or intercalation has been observed by XRD, despite the significant dispersion of the filler in the matrix which produced nanocomposites with a loss in transparency in the visible domain of less than 10% in the presence of 1% wt and 3% wt of mica fillers. The presence of micas does not affect the thermal behavior of the nanocomposites, which remains similar to that of the neat epoxy resin. The mechanical characterization of the epoxy resin composites revealed an increased Young’s modulus, whereas tensile strength was reduced. A peridynamics-based representative volume element approach has been implemented to estimate the effective Young’s modulus of the nanomodified materials. The results obtained through this homogenization procedure have been used as input for the analysis of the nanocomposite fracture toughness, which has been carried out by a classical continuum mechanics–peridynamics coupling approach. Comparison with the experimental data confirms the capability of the peridynamics-based strategies to properly model the effective Young’s modulus and fracture toughness of epoxy-resin nanocomposites. Finally, the new mica-based composites exhibit high values of volume resistivity, thus being excellent candidates as insulating materials.

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“…[23][24][25][26][27][28][29] Their combination with nanoparticles is a promising strategy to further improve the physicochemical properties. [30][31][32][33] It should be noted that although it appears a perspective direction, the evaluation of biopolymeric films effectiveness in real cases is still at a preliminary stage and it needs deeper investigations. In particular, proper additives must be found in order to tune the interfacial properties.…”

Section: Introductionmentioning

confidence: 99%

Halloysite nanotubes-based nanocomposites for the hydrophobization of hydraulic mortar

et al. 2021

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The treatment of stone surfaces for their protection from ageing caused by natural and anthropogenic effects is an open issue in materials development for Cultural Heritage. We thought interesting to verify the suitability of a modified cellulose biofilm filled with halloysite nanotubes as wax compatibilizers to design a protecting layer. A hydraulic mortar was selected as a stone prototype. To improve the physico-chemical properties of the covering layer, wax microparticles have been incorporated to control transport, consolidation and wettability features. In particular, different application protocols have been studied, namely brushing and spraying, to assess whether the proposed procedures can be scaled up. Colorimetric analysis has been carried out to evidence the applicability in terms of color alteration after the treatment. Water adhesion was investigated by measuring the contact angle values as a function of time to obtain information on spreading and adsorption phenomena. These physico-chemical properties have been correlated to the microstructure evidenced by both electron and optical microscopies. Graphic abstract

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Influence of the dispersing agents to obtain polymer–clay nanocomposites processed in two-steps using thermokinetic mixer

Cited by 5 publications

References 53 publications

Nano lamellar zirconium phosphate and screw speed changing properties of melt extrusion polypropylene nanocomposites

Nano lamellar zirconium phosphate and screw speed changing properties of melt extrusion polypropylene nanocomposites

Chemical and Mechanical Characterization of Unprecedented Transparent Epoxy–Nanomica Composites—New Model Insights for Mechanical Properties

Halloysite nanotubes-based nanocomposites for the hydrophobization of hydraulic mortar

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