Linear and non-linear nature of the flow of polypropylene filled with ferrite particles: from low to concentrated composites

Rueda, Martha Margarita; Fulchiron, René; Martin, Greg; Cassagnau, Philippe

doi:10.1007/s00397-017-1025-0

Cited by 7 publications

(4 citation statements)

References 60 publications

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“…From Figure 5, it can also be seen that as the strain increased, the storage modulus started to decrease. This is well-known phenomena (also referred to as Payne effect) that is characteristic for filled elastomers, highly filled suspension, and filled polymers [39][40][41][42][43][44][45][46][47][48]. In general, there are two reasons for storage modulus decrease with increasing strain.…”

Section: Strain Amplitude Sweepmentioning

confidence: 99%

Rheological Behaviour of Highly Filled Materials for Injection Moulding and Additive Manufacturing: Effect of Particle Material and Loading

et al. 2020

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Within this paper, we are dealing with a mixture of thermoplastic polymer that is filled with inorganic fillers at high concentrations up to 60 vol.%. A high number of particles in the compound can substantially change the rheological behaviour of the composite and can lead to problems during processing in the molten state. The rheological behaviour of highly filled materials is complex and influenced by many interrelated factors. In the present investigation, we considered four different spherical materials: steel, aluminium alloy, titanium alloy and glass. Particles with similar particle size distribution were mixed with a binder system at different filling grades (30–60 vol.%). We showed that the rheological behaviour of highly filled materials is significantly dependent on the chemical interactions between the filler and matrix material. Moreover, it was shown that the changes of the particle shape and size during processing lead to unexpected rheological behaviour of composite materials as it was observed in the composites filled with glass beads that broke at high contents during processing.

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Section: Strain Amplitude Sweepmentioning

confidence: 99%

Rheological Behaviour of Highly Filled Materials for Injection Moulding and Additive Manufacturing: Effect of Particle Material and Loading

et al. 2020

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“…When the filler content was 50 vol.%, the introduction of dispersing agent shortened the limit of linearity: c was reduced to 0.08% for PP + 50%Sn, and arrived at 0.03% for PP + 50%Sn + SA. This result was in contrast with screening effects exerted by SA among ferrite particles in polypropylene, verified by Rueda et al (2017b). Frequency sweep results were shown for neat and filled PP matrix, up to 50% of Tin particles, with or without SA, in Fig.…”

Section: Rheological Testing On Solid Particles In Polymer-based Compoundsmentioning

confidence: 78%

Viscoelastic behaviour of highly filled polypropylene with solid and liquid Tin microparticles: influence of the stearic acid additive

Patti

Acierno²,

Lecocq

et al. 2021

Rheol Acta

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In this work, highly filled composites made of a commercial polypropylene resin and low melting point Tin particles, up to 50 vol.% in loadings, have been prepared by melt blending process. The introduction of stearic acid (SA), a common dispersant, was investigated in compositions. The developed systems were characterized in terms of dynamic rheological testing. Final results confirmed a reduction of linear viscoelastic domain, by increasing filler loadings, with an effect more emphasized in the presence of SA. Contrary to literature studies, at equal filler content (50%), both moduli resulted to be superior for formulations containing the dispersing agent. A further rheological characterization continued on systems at 30 vol.% of particle loadings for highlighting differences depending on the SA addition. Specific tests were also performed at temperatures above the melting of Tin particles. Finally, optical microscopic analyses were carried out for gaining insight on sample microstructure, in controlled conditions of temperature and shear rate.

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“…The results showed that compared with pure HDPE, the melt strength of the composites with 2% nano-CaSO 4 is increased by nearly three times, and the tensile strength and elongation at break were increased by 9.16% and 31.43%. Although there are many studies on the application modification of calcium sulfate at present, most of the modification methods are relatively single, and the effect of compatibility with polymer materials after modification is general, 22,23 which limits its application. In addition, the calcium sulfate made from phosphogypsum is more difficult to modify and apply than calcium sulfate whiskers without impurities, so it is of greater significance to find a better modification method for the application of calcium sulfate prepared from phosphogypsum to HDPE.…”

Section: Introductionmentioning

confidence: 99%

Synergistic surface modification of anhydrous calcium sulfate by polydopamine/oleylamine and its application in reinforced HDPE composites

Xu,

Fang,

Chen

2024

Polymer Composites

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In the study, polydopamine and oleylamine cooperated to modify the surface of anhydrous calcium sulfate prepared from phosphogypsum, and HDPE matrix composites with different filler content were prepared by filling HDPE before and after modification. The results show that when the filler content is 5 wt%, the elongation at break of mCSA/HDPE composite is 31.7% and 89% higher than that of HDPE and CSA/HDPE. Respectively, when the filler content is as high as 25 wt%, the flexural strength is still 16.8% higher than that of HDPE. After modification, the compatibility and dispersibility of anhydrous calcium sulfate in HDPE were improved, and the crystal structure of anhydrous calcium sulfate was not significantly changed, thus the mechanical properties and thermal stability of mCSA/HDPE composites were improved. Overall, after modification, not only the mechanical properties of the composites are improved, but also the content of inorganic powder as filler added to HDPE is increased, which can be regarded as a method for effective utilization of phosphogypsum.Highlights Calcium sulfate was modified by polydopamine and oleylamine The mechanical and thermal properties of the modified calcium sulfate/HDPE composites are good. The resource utilization of phosphogypsum was carried out

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Linear and non-linear nature of the flow of polypropylene filled with ferrite particles: from low to concentrated composites

Abstract: International audienc

Cited by 7 publications

References 60 publications

Rheological Behaviour of Highly Filled Materials for Injection Moulding and Additive Manufacturing: Effect of Particle Material and Loading

Rheological Behaviour of Highly Filled Materials for Injection Moulding and Additive Manufacturing: Effect of Particle Material and Loading

Viscoelastic behaviour of highly filled polypropylene with solid and liquid Tin microparticles: influence of the stearic acid additive

Synergistic surface modification of anhydrous calcium sulfate by polydopamine/oleylamine and its application in reinforced HDPE composites

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