Influence of ultrasonic treatment in PP/CNT composites using masterbatch dilution method

Zhong, Jing; Isayev, A. I.; Huang, Keyuan

doi:10.1016/j.polymer.2014.02.014

Cited by 44 publications

(41 citation statements)

References 51 publications

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“…Designs 1 and 3 show approximately similar torque although they have different numbers of reverse and kneading elements. It can also be seen that the lower torque is always associated with the higher amplitude of ultrasound, which has already been reported by the previous studies with an explanation given in terms of permanent and thixotropic effects of the ultrasound on viscosity. From Fig.…”

Section: Resultssupporting

confidence: 85%

Ultrasonic treatment of PP/CNT composites during twin‐screw extrusion: Effect of screw configuration

Zhong

Isayev

2015

Polymer Composites

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PP/CNT composites were prepared by means of an ultrasonic twin extruder with three screw configurations at ultrasonic amplitudes up to 13 lm to compare their efficiency in dispersing CNT in PP. Using these screw configurations, the pressure in the ultrasonic treatment zone was varied in order to elucidate the effect of pressure on ultrasonic cavitation behavior in PP and PP/CNT composites. Rheological and mechanical behaviors were analyzed to reflect the dispersion of CNT. The results indicated that the dispersion of CNT in PP is more related to the number of kneading elements in the screw configuration and less to the residence time. This was explained by simulating the mixing effect using the flow analysis network.

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Section: Resultssupporting

confidence: 85%

Ultrasonic treatment of PP/CNT composites during twin‐screw extrusion: Effect of screw configuration

Zhong

Isayev

2015

Polymer Composites

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“…In this sense, Ramasamy [20] prepared polypropylene/graphene nanocomposites and observed negative values of the dielectric constant using amounts of 30%–40% of graphene. It was recently shown that the dispersion of nanoparticles in polymer matrices can be highly enhanced using ultrasound-assisted methods [21,22], thus opening the possibility of reducing the amount of nanoparticles to obtain metamaterial behavior.…”

Section: Introductionmentioning

confidence: 99%

Metamaterial Behavior of Polymer Nanocomposites Based on Polypropylene/Multi-Walled Carbon Nanotubes Fabricated by Means of Ultrasound-Assisted Extrusion

Pérez-Medina¹,

Waldo-Mendoza²,

Crúz-Delgado

et al. 2016

Materials

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Metamaterial behavior of polymer nanocomposites (NCs) based on isotactic polypropylene (iPP) and multi-walled carbon nanotubes (MWCNTs) was investigated based on the observation of a negative dielectric constant (ε′). It is demonstrated that as the dielectric constant switches from negative to positive, the plasma frequency (ωp) depends strongly on the ultrasound-assisted fabrication method, as well as on the melt flow index of the iPP. NCs were fabricated using ultrasound-assisted extrusion methods with 10 wt % loadings of MWCNTs in iPPs with different melt flow indices (MFI). AC electrical conductivity (σ(AC)) as a function of frequency was determined to complement the electrical classification of the NCs, which were previously designated as insulating (I), static-dissipative (SD), and conductive (C) materials. It was found that the SD and C materials can also be classified as metamaterials (M). This type of behavior emerges from the negative dielectric constant observed at low frequencies although, at certain frequencies, the dielectric constant becomes positive. Our method of fabrication allows for the preparation of metamaterials with tunable ωp. iPP pure samples show only positive dielectric constants. Electrical conductivity increases in all cases with the addition of MWCNTs with the largest increases observed for samples with the highest MFI. A relationship between MFI and the fabrication method, with respect to electrical properties, is reported.

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“…The lower fractal dimension of CNT and higher backbone fractal dimension result in comparatively better dispersions (Zhong et al 2014). (Bower et al 1999) CNTs: In Polystyrene Polymeric Composites…”

Section: Cnts: In Polypropylene Polymeric Compositesmentioning

confidence: 99%

Multifunctionalized Carbon Nanotubes Polymer Composites: Properties and Applications

Julkapli

Sapuan

2015

Advanced Structured Materials

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Carbon nanotubes (CNTs) is a rigid rod-like nanoscale material produced from carbon in powder, liquid, or gel form via acid or chemical hydrolysis. Due to its unique and exceptional renewability, biodegradability, mechanical, physicochemical properties, and abundance, the incorporation associated with a small quantity of CNTs to polymeric matrices enhance the mechanical and thermal resistance, and also stability of the latter by several orders of magnitude. Moreover, NCC-derived carbon materials are of no serious threat to the environment, providing further impetus for the development and applications of this green and renewable biomaterial for lightweight and degradable composites. Surface functionalization of CNTs remains the focus of CNTs research in tailoring its properties for dispersion in hydrophilic and hydrophobic media. Through functionalization, the attachment of appropriate chemical functionalities between conjugated sp 2 of CNTs and polymeric matrix is established. It is thus of utmost importance that the tools and protocols for imaging CNTs in a complex matrix and quantify its reinforcement, antimicrobial, stability, hydrophilicity, and biodegradability are be developed.

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Influence of ultrasonic treatment in PP/CNT composites using masterbatch dilution method

Cited by 44 publications

References 51 publications

Ultrasonic treatment of PP/CNT composites during twin‐screw extrusion: Effect of screw configuration

Ultrasonic treatment of PP/CNT composites during twin‐screw extrusion: Effect of screw configuration

Metamaterial Behavior of Polymer Nanocomposites Based on Polypropylene/Multi-Walled Carbon Nanotubes Fabricated by Means of Ultrasound-Assisted Extrusion

Multifunctionalized Carbon Nanotubes Polymer Composites: Properties and Applications

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