Investigation on Properties of Polypropylene/Multi-walled Carbon Nanotubes Nanocomposites Prepared by a Novel Eccentric Rotor Extruder Based on Elongational Rheology

Yuan, Ding; Wu, Ting; Chen, Rongyuan; Zhang, Guizhen; Qu, Jinping

doi:10.1080/00222348.2018.1462648

Cited by 10 publications

(5 citation statements)

References 40 publications

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“…Manas-Zloczower et al compared the efficiency of desperation under the elongational flow with that under the shear flow, and the results showed that the elongational flow was 10 times more efficient than the shear flow . Qu et al − invented a method and technology for eccentric rotor volume pulsation, deformation, and plasticization, as well as analyzed the dispersion and mixing effect of polymer composites formed by an eccentric rotor extruder (ERE) based on elongational deformation and a twin-screw extruder based on shear deformation separately. The results indicated that elongational deformation has better dispersion as well as a shorter thermal forming process, making ERE a practical solution for molding of high solid content and easily degradable polymer-based composites.…”

Section: Introductionmentioning

confidence: 93%

Improved Through-Plane Thermal Conductivity and Mechanical Properties of Low-Dielectric FEP/HBN Composites by Adding PTFE Nanoparticles

Zhang

Yin

Yan

et al. 2021

ACS Appl. Electron. Mater.

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The development of polymer dielectric materials with low dielectric constant and dielectric loss, high-temperature resistance, and mechanical strength is of great significance to meet the requirements of high-performance, thermally conductive, and dielectric materials in the 5G field. In this study, we designed a mixing device, a push−pull mixer (PPM) based on the elongational deformation theory, to overcome problems encountered during the formation of polymer-based composites with a high content of thermally conductive fillers. Hexagonal boron nitride nanoparticles (nmHBN), HBN microparticles (μmHBN), and poly(tetrafluoroethylene) (PTFE) fillers were introduced into the fluorinated ethylene propylene (FEP) matrix to enhance the thermal conductivity of FEP. Fillers were dispersed uniformly in the matrix, and PTFE powders effectively disrupted the transverse orientation of HBN formed during compression, as confirmed by the results of scanning electron microscopy (SEM) and rheological behavior measurements. When the ratio of FEP/nmHBN/μmHBN/PTFE was 68:12:15:5, the in-plane and through-plane thermal conductivities of the composite were 1.61 and 0.43 W/(m•K), which were ∼16 times and 4 times that of the FEP matrix, respectively, and the tensile stress of the composite was 14.73 MPa, the same level as pure FEP. In addition, the dielectric constant and dielectric loss at 1 MHz of the FEP/nmHBN/μmHBN/PTFE composites maintained low levels of 2.6 and 0.014, respectively.

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Section: Introductionmentioning

confidence: 93%

Improved Through-Plane Thermal Conductivity and Mechanical Properties of Low-Dielectric FEP/HBN Composites by Adding PTFE Nanoparticles

Zhang

Yin

Yan

et al. 2021

ACS Appl. Electron. Mater.

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“…This could be due to an increase in CNTs agglomerations in the matrix with an increase in CNTs content, 86,87 which act as stress concentration and crack initiation sites with a reduction in tensile strength. 21,23 Although the decrease in elongation or ductility can be a result of the formation of network configuration by the CNTs in the PP matrix, in addition to the large difference in modulus of PP matrix and CNTs 88 and formation of CNTs aggregate that serves as stress concentration zone, crack initiation and propagation. 89,90 Modification or functionalisation of reinforcements is one of the ways extensively used to ensure their compatibility with PP matrix.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

A review of recent advances on the properties of polypropylene - carbon nanotubes composites

Uyor

Popoola

et al. 2022

Journal of Thermoplastic Composite Materials

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Polypropylene (PP) has a wide range of engineering applications in automobile, biomedical, energy, machine parts, electronic packaging etc. However, PP lacks some desired engineering properties such as good thermal properties and mechanical strength. For instance, PP is known for its low melting temperature, high flammability and low heat resistance. This has resulted in continuous improvement in various properties of PP via modification of its matrix. One of the ways this has been achieved is by incorporation of foreign bodies in form of reinforcements in the PP matrix. The recent discovery of carbon nanotubes (CNTs) has further paved the ways for advancing the properties of PP via the development of PP-CNTs composites. Such composites have not only shown improved engineering properties but retain the lightweight and flexibility of PP. The advanced engineering properties recorded by various studies using PP-CNTs composites are due to the good properties of PP in conjunction with the excellent properties of CNTs such as high thermal conductivity, strength, electron mobility and formation of conductivity networks in the PP matrix. Although the development of PP-CNTs composites faces challenges of high agglomeration and incompatibility of CNTs in the matrix, the moves towards addressing the hurdles and achievements recorded so far are encouraging. Therefore, this review investigated the contribution of CNTs on various advanced engineering properties of PP-CNTs composites. Various results drawn from previously published literature within the decade were tabulated for future academic references and industrial purposes. Current hurdles faced by PP-CNTs composites, future prospect and their advanced engineering applications were discussed.

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“…Through kinematic analysis of the relevant physical quantities of the fixed rotor, the movement characteristics of the fixed rotor in the cavity of the eccentric rotor extruder were described in detail; through disassembly experiments and theoretical modeling, the spatial variation law of material volume during the plasticizing conveying process of the eccentric rotor was analyzed. Yuan Ding et al [32] analyzed the kinematic relationships of the rotor in the straight section, the Appl. Sci.…”

Section: Introductionmentioning

confidence: 99%

Kinematics-Based Design Method and Experimental Validation of Internal Meshing Screw for High-Viscosity Fluid Mixing

Guo,

Liu,

Hao

et al. 2024

Applied Sciences

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The challenge of mixing high-viscosity materials is a common issue encountered in the manufacturing process of food materials. The advantages of the internal meshing screw mixer have led to its adoption in various manufacturing processes, but it has yet to be implemented in the food industry. The paper presents a design method for an internal meshing screw mixer based on kinematic principles. The mixer features a helical chamber created by alternating volumes formed by the stator and rotor, establishing an extension-dominated environment for mixing high-viscosity fluids. A kinematic model based on the internal cycloid principle was established, providing trajectories and equations for key points on the rotor, simulating both its rotation and revolution processes, and revealing the velocity variations at different points on the rotor. Based on the kinematic analysis results, a stator and rotor design method was developed according to relevant functional divisions. To achieve the desired motion effects, transmission and support devices were designed, and the relationship between the transmission device and the internal cycloid surface of the fixed rotor was established. The mixer’s application and mixing effectiveness in the food industry were validated using corn syrup and flour. Experimental results showed that the extensional mixer described in the paper effectively mixed high-viscosity fluids while also efficiently blending fine powders. Slurry viscosity was tested with a rheometer at different speeds with an eccentric rotor mixer. Results showed that viscosity decreased with increasing shear rate, with a more pronounced decrease at higher shear rates. The apparent viscosity trend remained consistent at different speeds, although variations were observed at lower shear rates, especially concerning speed. The non-Newtonian fluid index exhibited minimal variations at different speeds, while the consistency coefficient showed significant fluctuations. The mixing uniformity index of the slurry was used to evaluate the mixing uniformity and dispersion uniformity of this extensional mixer. At different rotational speeds, the density of the slurry changes little. The uniformity index of mixing decreases gradually with the increase of rotational speed, reaching its maximum at 15 r/min. The overall trend of the uniformity index decreases with increasing rotational speed, indicating a decrease in density uniformity. A peak appears at 45 r/min, possibly due to the maximum values of elongation rate and shear rate at this speed. As the rotational speed increases, the residence time of the material in the mixer decreases, which may be the main reason for the decrease in mixing uniformity. These findings provide valuable insights into the design and utilization of extension-dominated screw mixers within the food industry, laying a solid foundation for future research and practical applications in this field.

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Investigation on Properties of Polypropylene/Multi-walled Carbon Nanotubes Nanocomposites Prepared by a Novel Eccentric Rotor Extruder Based on Elongational Rheology

Cited by 10 publications

References 40 publications

Improved Through-Plane Thermal Conductivity and Mechanical Properties of Low-Dielectric FEP/HBN Composites by Adding PTFE Nanoparticles

Improved Through-Plane Thermal Conductivity and Mechanical Properties of Low-Dielectric FEP/HBN Composites by Adding PTFE Nanoparticles

A review of recent advances on the properties of polypropylene - carbon nanotubes composites

Kinematics-Based Design Method and Experimental Validation of Internal Meshing Screw for High-Viscosity Fluid Mixing

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