An Overview of Progress and Current Challenges in Ultrasonic Treatment of Polymer Melts

Ávila‐Orta, Carlos A.; Espinoza-González, Carlos; Martinez-Colunga, Guillermo; Bueno-Baqués, D.; Maffezzoli, Alfonso; Lionetto, Francesca

doi:10.1002/adv.21303

Cited by 42 publications

(18 citation statements)

References 78 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In non-Newtonian fluids, the bubble in polymer solution implodes less violently compared to a Newtonian fluid such as water (Figure 12), which makes the impact of the liquid jet on the limit very small or even null. In particular, the dynamics of the collapse of bubbles near a solid boundary appears to be a critical problem in the dispersion of nanostructures in liquid systems, since the impact of the liquid jet on the surface of the agglomerates is considered mechanism dominant for the reduction of agglomerate size during acoustic cavitation [68].…”

Section: Models Of the Mechanism Of Dispersion Of Nps In Ultrasound-amentioning

confidence: 99%

Ultrasound-Assisted Melt Extrusion of Polymer Nanocomposites

Ávila‐Orta¹,

González‐Morones²,

Valdez³

et al. 2019

Nanocomposites - Recent Evolutions

View full text Add to dashboard Cite

A review of the latest developments in ultrasound-assisted melt extrusion of polymer nanocomposites is presented. In general, the application of ultrasound waves during melt extrusion of polymer in the presence of nanoparticles results in a more homogeneous dispersion of the nanoparticles in the polymer matrix. In spite of this, a lack of understanding in the field has hindered the development of this processing technique. Based on the analysis of literature on the field, key aspects are identified for a better understanding of the physical and chemical effects of ultrasound waves and the fabrication of polymer nanocomposites by means of melt extrusion. others [1,2]. One of the most popular methods used to prepare such materials is melt extrusion, since it is a flexible and versatile process, which does not require the use of solvents and can be scaled up at industrial level.However, even with all these advantages, the lack of homogeneous dispersion of nanoparticles in the polymer matrix is still a problem with melt extrusion. An alternative to improve the dispersion is the application of ultrasound waves during the polymer processing in the molten state, named ultrasound-assisted extrusion. The first report of the use of ultrasound coupled in extrusion was made by Isayev et al. for processing vulcanized elastomers devulcanization [3]. These authors reported that the ultrasound waves have the ability to cause an incision in the C-S and S-S bonds of the crosslinked rubber, causing the breaking of the reticulated network and thereby achieving the devulcanization of the rubber. Later, it was applied to the study of polymer mixtures in the molten state [4], and in the last decade, this technology has been used for the preparation of polymer nanocomposites. Although it has been proven that this technology improves the dispersion of nanoparticles and that it has a great potential for application, the fundamentals for applying this technology in melt extrusion process are still not well understood. For example, the effects observed by the application of ultrasound have been explained on the basis of acoustic cavitation, treating the molten polymer as a Newtonian system; however, polymer cannot be considered as Newtonian fluids. For this reason, a general overview of the basic principles of ultrasound, the development and use of this technology in the preparation of polymeric nanocomposites in the molten state, and the mechanisms that have been proposed so far for the understanding of the phenomenon that generates the dispersion of the nanoparticles in the polymer is described below. Extrusion applied in the manufacture of polymeric nanocomposites 2.1. Polymers and nanoparticlesThermoplastic polymers and nanoparticles are the main materials used to produce polymer nanocomposites by melt extrusion. Thermoplastic polymers include polyolefins, polyesters, and polyamides among other polymer families. On the other hand, the nanoparticles can be classified according to the number of dimensions in the nanometer range. Zero-dime...

show abstract

Section: Models Of the Mechanism Of Dispersion Of Nps In Ultrasound-amentioning

confidence: 99%

Ultrasound-Assisted Melt Extrusion of Polymer Nanocomposites

Ávila‐Orta¹,

González‐Morones²,

Valdez³

et al. 2019

Nanocomposites - Recent Evolutions

View full text Add to dashboard Cite

show abstract

“…Due to the relatively low amount of nanofiller which can be dispersed in polymer matrices, improvement of the mechanical properties can actually be achieved by increasing nanofiller high aspect ratio [18][19], orientation [20][21] and homogenous dispersion [22][23].…”

Section: Introductionmentioning

confidence: 99%

Orientation of Graphene Nanoplatelets in Thermosetting Matrices

Greco

Lionetto

Maffezzoli

2016

IEEE Trans. Nanotechnology

Self Cite

View full text Add to dashboard Cite

A simple procedure for the alignment of graphene nanoplatelets (GNPs) in a thermosetting matrix is presented. First, the alignment of GNPs in thermoplastic fibers of amorphous polyetylene terephthalate (aPET) is achieved by a fiber spinning process. The nanocomposite fibers, obtained with a very high filler content (10 wt%), are then transferred into a reactive epoxy resin. After dissolution of aPET, the nanofillers remained oriented in the thermosetting matrix. The characterization of the obtained nanocomposites has been carried by means of different experimental techniques which provided complementary results. The proposed method has the potential to be used in the manufacturing of hierarchical composites, by introducing nanofilled microfibers into continuous fibers reinforced composites.

show abstract

“…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%

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

View full text Add to dashboard Cite

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.

show abstract

An Overview of Progress and Current Challenges in Ultrasonic Treatment of Polymer Melts

Cited by 42 publications

References 78 publications

Ultrasound-Assisted Melt Extrusion of Polymer Nanocomposites

Ultrasound-Assisted Melt Extrusion of Polymer Nanocomposites

Orientation of Graphene Nanoplatelets in Thermosetting Matrices

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

Contact Info

Product

Resources

About