Structure and tensile properties of polypropylene/carbon nanotubes composites prepared by melt extrusion

Liu, Yanhui; Zuo, Jing; Qin, Jie; Li, Chengwu

doi:10.2478/s13536-013-0198-1

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…Figure 2(a) and 2(b) reveal the improvements in the tensile strength and modulus with the addition of CNTs. Based on a study conducted by Li C. and co-workers, the degree of dispersion may be correlated to the mechanical performance of the polymer nanocomposite based on carbon nanotubes [24]. The elastic modulus of HDPE, HDPE-1CNT, and HDPE-2CNT was calculated to be 1200, 1500, and 1660 MPa, which represents a gradual improvement of 25% and 38% with the addition of 1 wt% and 2 wt% CNT, respectively.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

“…In other cases, very little number of studies have demonstrated that single screw extrusion may be employed for production of a polymer nanocomposite. For instance, Liu et al demonstrated that homogeneous dispersion of carbon nanotubes in a polypropylene matrix could be prepared with single screw extrusion method [24]. Based on the study, 1 wt% CNT concentration in Polypropylene achieved about 16% and 36% increase in the Young's Modulus and Tensile strength, respectively [24].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Liu et al demonstrated that homogeneous dispersion of carbon nanotubes in a polypropylene matrix could be prepared with single screw extrusion method [24]. Based on the study, 1 wt% CNT concentration in Polypropylene achieved about 16% and 36% increase in the Young's Modulus and Tensile strength, respectively [24]. This route can be used as a complimentary process for further processing of polymer nanocomposite prepared via master-batch method with twin-screw extrusion.…”

Section: Introductionmentioning

confidence: 99%

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Observations of a novel strengthening mechanism in HDPE nanocomposites

Okolo

2018

Nanocomposites

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Previous strengthening mechanisms described in literature for high density polyethylene (HDPE) carbon nanotubes composites are typical of those observed in fibre reinforced polymeric micro composites. Here, we present a new molecular level strengthening mechanism based on HDPE carbon nanotubes composite, which has not been reported before to the best of authors' knowledge. The HDPE nanocomposite was produced by melt intercalation technique via twin-screw extrusion. Thereafter, the samples were subjected to mechanical tensile tests and scanning electron microscope (SEM) examination. Carbon nanotubes (CNTs) were found to be disentangled from the polymer molecules after yielding and prior to breaking. SEM and optical microscopic observations revealed visible black agglomerate bands at 45 appeared after yielding and prior to the breaking of the ductile HDPE. It was observed that CNTs were pushed out from the intricate mechanical interlocking with the thermoplastic polymeric chains of HDPE during strain hardening. ARTICLE HISTORY

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Section: Mechanical Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Observations of a novel strengthening mechanism in HDPE nanocomposites

Okolo

2018

Nanocomposites

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“…Different approaches have been proposed to prepare PP/CNT include melt mixing , in‐situ polymerization , and solution methods. Synthesis methods can directly influence nanotube dimension, dispersion, and interaction with the polymer.…”

Section: Introductionmentioning

confidence: 99%

Effect of screw configuration on the dispersion and properties of polypropylene/multiwalled carbon nanotube composite

et al. 2019

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The effect of extruder screw configuration on the dispersion and properties of compatibilised polypropylene (PP)/multi-walled carbon nanotube (MCNT) composite is investigated. Three principle screw designs with mainly conveying elements (medium intensity), kneading elements (high intensity), and folding elements (chaotic mixing) were used to prepare polypropylene nanocomposites containing 4wt% of maleic anhydride grafted polypropylene (MAH-g-PP) compatibilizer and different nanotube loadings. The effect of each screw configuration and nanotube loading on the tensile, rheological, and electrical properties of the nanocomposites were studied. The screw configurations were found to have a strong influence on the electrical resistivity while only slightly affected the tensile properties of the nanocomposites. Scanning electron microscopy examinations showed that the use of screw configuration consisting of kneading elements promoted the dispersion of nanotubes and resulted in a low electrical percolation at 2wt% of MCNT.

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“…Typical diffraction peaks at various 2θ are labelled with their corresponding crystal planes in figure. 20,21 Notably, the addition of the nanoparticles in the PP matrix decreased the broad diffraction peaks of pure PP at 2θ = 27.3 o and 41.7 o , which a indicates reduction in amorphous regions of the nanocomposites with possible increase in the crystalline domains. This could have also contributed to the improved thermal, mechanical, and thermomechanical properties of the nanocomposites in this study.…”

Section: Ftir and Xrd Analysesmentioning

confidence: 92%

Enhanced mechanical and dynamic mechanical properties of polymer nanocomposites containing carbon nanotubes decorated with barium titanate

Uyor

Popoola

2022

Polymers and Polymer Composites

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This study presents functionalized carbon nanotubes (CNTs) decorated with functionalized barium titanate (BT) (denoted as BT@CNTs) via hydrothermal and self-assembly methods to improve dispersion in polypropylene (PP) matrix with enhanced thermal, mechanical, and thermomechanical properties. The CNTs, BT, and BT@CNTs with the addition of polypropylene maleic anhydride (PPMA) compatibilizer were used in the fabrication of the PP based nanocomposites for this study via solution mixing and melt compounding. FTIR, TEM, and SEM analyses, respectively revealed that the nanoparticles were successfully functionalized, CNTs decorated with BT, and well dispersion in the PP matrix. PP/BT@CNTs-based nanocomposite showed optimal tensile strength, modulus, heat deflection, and thermal stability of about 16.8%, 26.5%, 20.1%, and 30oC higher than that obtained for the pure PP. These properties were also respectively 10.6%, 17.6%, 19.0%, and 5.0oC higher than PP/3CNTs nanocomposite when compared to PP/3BT@CNTs. The PP/BT@CNTs based nanocomposites also revealed enhanced dynamic mechanical properties. The better performance in the measured properties of PP/BT@CNTs compared to pure PP and PP/CNTs were attributed to their uniform microstructures, effective interlocking of the PP matrix due to the presence of BT on CNTs surfaces.

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Structure and tensile properties of polypropylene/carbon nanotubes composites prepared by melt extrusion

Cited by 7 publications

References 22 publications

Observations of a novel strengthening mechanism in HDPE nanocomposites

Observations of a novel strengthening mechanism in HDPE nanocomposites

Effect of screw configuration on the dispersion and properties of polypropylene/multiwalled carbon nanotube composite

Enhanced mechanical and dynamic mechanical properties of polymer nanocomposites containing carbon nanotubes decorated with barium titanate

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