Effect of ultrasonic oscillations on the rheological behavior and morphology of Illite‐filled high‐density polyethylene composites

Li, Yuntao; Chen, Guangshun; Guo, Shaoyun; Li, Huilin

doi:10.1002/app.21440

Cited by 13 publications

(11 citation statements)

References 30 publications

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“…A higher ultrasonic intensity facilitated the transfer of vibration energy to the melt system; this reduced the number of entangled polymer chains and improved polymer melt viscosity. This observation was consistent with the results predicted by Li et al …”

Section: Resultssupporting

confidence: 94%

“…The rheological behavior of a polymer composite system depends on its structure and properties, which include the two‐phase component surface‐to‐volume ratio, viscosity, and elasticity ratio, and on the dispersion characteristics of the dispersed phase, such as the morphology, size distribution of the dispersed phase, and biphasic interfacial interactions . The processing conditions, such as the temperature, pressure, and shear rate of the screw, also significantly influence the viscosity of the molten composites, especially under ultrasonic vibration treatment …”

Section: Introductionmentioning

confidence: 99%

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Effects of ultrasonic vibration on the rheological behavior of high‐density polyethylene composites filled with flash aluminum flake pigments

Hong

Xiao

Zhang

et al. 2017

J of Applied Polymer Sci

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The metallic effect of polymer composites was produced through the loading of flash aluminum flake pigments (FAFPs) into polymers. This production method could eliminate postprocessing techniques, such as spray coating, painting, or metallization. We used a self-improved, ultrasound-assisted capillary rheometer to explore the rheological behavior of high-density polyethylene composites filled with FAFPs in the absence and presence of ultrasound treatment. The effects of the ultrasound intensity, experimental temperature, filler content, and particle size on the composite viscosity were studied. The results show that the composite viscosity not only decreased as the ultrasound intensity, experimental temperature, and particle size increased but also decreased as the filler content decreased. A viscosity model of the polymer melts was proposed to illustrate the relationship between the viscosity and ultrasonic intensity. The viscosity obeyed the equations under ultrasonic vibration. The predicted results for the composite viscosity complied greatly with the experimental values.

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Section: Resultssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Effects of ultrasonic vibration on the rheological behavior of high‐density polyethylene composites filled with flash aluminum flake pigments

Hong

Xiao

Zhang

et al. 2017

J of Applied Polymer Sci

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“…The limiting intrinsic viscosity was found to be 161.86, 111.12 and 79.96 l/g for 50, 150 and 250 W respectively, which confirmed that limiting viscosity also reduced with an increase in power dissipation. Li et al [49] reported that the apparent viscosity decreased with an increase in the ultrasound power for the extrusion of HDPE/Illite (70/30) composites. Czechowska-Biskup et al [13] reported that the efficiency of sonochemical processes was significantly affected by ultrasound power, polymer concentration and gas used to saturate the solution.…”

Section: Effect Of Power Dissipationmentioning

confidence: 99%

Depolymerization using sonochemical reactors: A critical review

Gogate

Prajapat

2015

Ultrasonics Sonochemistry

107

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Ultrasonic irradiation has been proposed as a novel approach for degradation of polymer compounds, especially considering the fact that the reduction in the molecular weight (also the intrinsic viscosity) is simply by splitting the most susceptible chemical bond without causing any changes in the chemical nature. An overview of the application of ultrasound for the polymer degradation has been presented in this work, discussing the mechanism of degradation, kinetic modeling, effect of operating parameters and the type of reactors generally used for depolymerization. The effect of important operating parameters such as initial polymer concentration, presence of functional groups in the polymer chain, reaction volume, initial molecular weight, temperature, operating frequency, power dissipation and use of process intensifying additives have been discussed also giving guidelines about selection of the optimum parameters. It has been observed that the low concentrations and higher power dissipation (till an optimum) are favorable resulting in higher extents of degradation. Typically low frequency is recommended but for the case of water soluble polymers, higher frequencies would also give similar results due to the dominant action of chemical effects of cavitation. It has been demonstrated that the alkyl group substituent also affects the degradation rate of polymer. An overview of degradation using combined approach based on ultrasound and additives with comparison with individual approach has also been presented. It has been observed that the main contributing factor for the synergy of the combined approach is the selection of optimum loading of additives. Overall, it has been observed that efficient polymer degradation can be achieved using combined process based on the use of ultrasound.

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“…Ultrasound-induced dispersion of nanoparticles and degradation of the polymeric matrix can jointly determine the reduction. 12,19,22 According to the linear viscoelastic theory, the slopes of lg G¢Àlg o and lg G¢¢Àlg o in the terminal zone (that is, the low-frequency zone) are closely related to the variation in the polydispersity of the polymer matrix and the composite morphology. [23][24][25][26] In general, as the width of the molecular weight distribution increases, the slopes decrease.…”

Section: W 100wmentioning

confidence: 99%

“…In view of the cost-effectiveness and feasibility of the available processing techniques, melt blending of polymers with nanoparticles is still the optimum method of compounding. To achieve homogeneous dispersions of nanoparticles in polymeric matrices and to enhance the interactions between fillers and polymer matrices during the melt-blending process, several methods are generally applied: 4,[9][10][11][12][13] (1) the surface modification of nanoparticles with coupling agents or active monomers; (2) the polar group functionalization of polymers with partial oxidation, g-rays, electron beams, microwaves, UV irradiation or polar grafting; (3) the addition of a bifunctional component (compatibilizer) that can interact with both fillers and polymer matrices; and (4) the mechanochemical modification of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Effects of ultrasound on the morphology and properties of propylene-based plastomer/nanosilica composites

Peng

Bao

et al. 2010

Polym J

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Propylene-based plastomer/nanosilica composites, with a filler content of 1-4 wt%, were prepared by a specially designed ultrasound-assisted extrusion system that was developed in our laboratory. The effects of ultrasound on the morphology, as well as the rheological and mechanical properties of the composites, were studied in this paper. In spite of slight ultrasound-induced degradation of the polymeric matrix, the results showed that the strength and elongation of the composites at break, in most cases, still improve in the presence of ultrasound because of ultrasound-induced homogeneous dispersion of nanoparticles in the polymeric matrix (as confirmed by scanning electron microscope, transmission electron microscope and differential scanning calorimetry studies). Dynamic rheological measurements also indicate that ultrasound-induced compatibilization has a more predominant role than does degradation. From dynamic mechanical measurements, it was found that ultrasound-induced degradation results in a drop in the dynamic storage modulus and glass transition temperature for composites with 4 wt% filler content, whereas ultrasound-induced compatibilization enhances their loss factor values. Polymer Journal (2011) 43, 91-96; doi:10.1038/pj.2010; published online 3 November 2010Keywords: extrusion; morphology; polymer-matrix composites (PMCs); properties; ultrasound INTRODUCTIONIn recent years, polymer/inorganic nanocomposites, in which the size of the dispersed particles is o100 nm in at least one dimension, have attracted tremendous interest in both academic and industrial researchers. Many studies report significant improvement in the desired properties of nanocomposites, such as their mechanical properties, barrier properties, optical transparency and solvent/heat resistance, compared with those of bulk polymers or conventional microcomposites. 1-3 These improvements can be achieved at a very low loading of the inorganic component (1-10 wt%) compared with conventional filled polymers, which require high loading (25-40 wt%). These studies indicate that polymer/inorganic nanocomposites are much lighter in weight and easier to process than conventional microcomposites. 4 To a large extent, improvement in these properties depends on the morphology and dispersion of the nanoparticles in the matrix. However, obtaining a homogeneous dispersion of nanoparticles in a polymeric matrix is a very difficult task when using only a simple mixing method, because of the strong tendency of nanoparticles to agglomerate. To break down the agglomerates of nanoparticles, many researchers have attempted various routes to prepare nanostructural composites in recent years, such as the sol-gel process, 5 in situ intercalative polymerization 6,7 and in situ polymerization in the presence of nanoparticles. 8 These methods, characterized by complex polymerization and special conditions, are not only incompatible with current industrial processes such as extrusion and injection molding, but are also inapplicable for the mass production of po...

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Effect of ultrasonic oscillations on the rheological behavior and morphology of Illite‐filled high‐density polyethylene composites

Cited by 13 publications

References 30 publications

Effects of ultrasonic vibration on the rheological behavior of high‐density polyethylene composites filled with flash aluminum flake pigments

Effects of ultrasonic vibration on the rheological behavior of high‐density polyethylene composites filled with flash aluminum flake pigments

Depolymerization using sonochemical reactors: A critical review

Effects of ultrasound on the morphology and properties of propylene-based plastomer/nanosilica composites

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