Processing and characterization of polyethylene-based composites

Khanam, P. Noorunnisa; Al-Maadeed, Somaya

doi:10.1179/2055035915y.0000000002

Cited by 146 publications

(149 citation statements)

References 111 publications

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“…The agglomeration for high wt% for fillers was reported elsewhere [40]. Various published work about the good dispersion of lower wt% of the additives in polymer composites were also reported [39,41,42]. The 1% and 10% C-GNP samples have more brittle behaviors as the samples have less stretched endings [43] compared to 4 wt%.…”

Section: Sem Analysismentioning

confidence: 86%

Melt processing and characterisation of polyamide 6/graphene nanoplatelet composites

et al. 2015

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Composites of Linear Low Density Polyethylene (LLDPE) and Graphene Nanoplatelets (GNPs) were processed using a twin screw extruder under different extrusion conditions. The effects of screw speed, feeder speed and GNP content on the electrical, thermal and mechanical properties of composites were investigated. The inclusion of GNPs in the matrix improved the thermal stability and conductivity by 2.7% and 43%, respectively. The electrical conductivity improved from 10 -11 to 10 -5 S/m at 150 rpm due to the high thermal stability of the GNPs and the formation of phonon and charge carrier networks in the polymer matrix. Higher extruder speeds result in a better distribution of the GNPs in the matrix and a significant increase in thermal stability and thermal conductivity. However, this effect is not significant for the electrical conductivity and tensile strength. The addition of GNPs increased the viscosity of the polymer, which will lead to higher processing power requirements. Increasing the extruder speed led to a reduction in viscosity, which is due to thermal degradation and/or chain scission. Thus, while high speeds result in better dispersions, the speed needs to be optimized to prevent detrimental impacts on the properties.

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Section: Sem Analysismentioning

confidence: 86%

Melt processing and characterisation of polyamide 6/graphene nanoplatelet composites

et al. 2015

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“…Development of electronic devices working at high operating frequencies, such as fast computers, mobile phones, and so forth, demands high dielectric constant materials with both mechanical strength and ease of processing . Optimum dielectric constant, low dielectric loss, high thermal conductivity, coefficient of thermal expansion similar to that of silicon and good mechanical properties are required for an ideal substrate material .…”

Section: Introductionmentioning

confidence: 99%

Novel high‐density polyethylene‐niobium pentoxide dielectric materials

et al. 2018

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This study for the first time reports the processing and properties of high‐density polyethylene (HDPE) reinforced with niobium pentoxide (Nb2O5) up to 40 wt%. In this work, Nb2O5 was chosen as reinforcement because of its advantageous properties such as good dielectric properties, high temperature stability and excellent biocompatible properties. Almost fully dense HDPE–Nb2O5 composites were prepared via hot pressing route. Both the hardness and dielectric properties of the HDPE increased significantly with the addition of Nb2O5. The hardness of HDPE increased from ∼37 to 60 MPa (i.e., by 62%) with the addition of 40 wt% Nb2O5. The dielectric constant and dissipation factor (dielectric loss) were found to increase with the increasing Nb2O5 content. We have achieved highest ever reported dielectric constant (ε') of 14.66 for HDPE–40 wt% Nb2O5 and the dielectric constant of HDPE is enhanced by 237% and shows the potential of Nb2O5 in improving the dielectric and hardness properties of HDPE. With increasing frequency there was slight decrease in the dielectric constant of HDPE–Nb2O5 composites, whereas not much change in the dielectric constant of pure HDPE. The dielectric constant (ε') of HDPE is 4.6 at 1 MHz, while the ε' value for the composite with 40 wt% Nb2O5 ceramic filler was found to be 13.2. The dielectric loss for the HDPE composites is higher than the neat polymer, particularly HDPE–40 wt% Nb2O5 composite measured with maximum dielectric loss (0.08) at 100 Hz. Nevertheless, the dielectric loss of HDPE materials significantly decreased with further increasing the frequency to 1 kHz and the dielectric loss even significantly lowered with increasing frequency to 1 MHz. The experimental values of dielectric constant show much better values than the calculated values based on theoretical models. The newly developed HDPE–Nb2O5 composites are showing much better dielectric properties than the reported literature values of HDPE materials. POLYM. COMPOS., 40:749–757, 2019. © 2018 Society of Plastics Engineers

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“…The intensity of diffraction peaks at 21.6 ∘ and 24.0 ∘ was increased with increasing CNTs content, which suggests the crystallinity of the LLDPE fiber was increased by filled CNTs. The addition of CNTs to the polymer provided a large interface area between the CNTs and polymer, which in turn created very suitable conditions for the nucleation and crystallization process during heating [2,33]. Figure 1(b) shows the XRD pattern of LLDPE treated by the heat drawing process as a function of the CNTs content.…”

Section: Characterizationmentioning

confidence: 99%

“…However, comparing Figures 2(a) and 2(b), the melting feature of the drawn LLDPE is broader than that of the undrawn LLDPE. This is because the crystal size became broader with increasing crystallinity of LLDPE fiber by heat drawing process [2,30,36]. Table 1 shows values for the degree of crystallinity calculated using (1) from the melting enthalpy of the DSC patterns of the drawn and undrawn LLDPE fibers.…”

Section: Characterizationmentioning

confidence: 99%

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Effect of Heat Drawing Process on Mechanical Properties of Dry-Jet Wet Spun Fiber of Linear Low Density Polyethylene/Carbon Nanotube Composites

Kim

Lee

2017

International Journal of Polymer Science

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Polyethylene is one of the most commonly used polymer materials. Even though linear low density polyethylene (LLDPE) has better mechanical properties than other kinds of polyethylene, it is not used as a textile material because of its plastic behavior that is easy to break at the die during melt spinning. In this study, LLDPE fibers were successfully produced with a new approach using a dry-jet wet spinning and a heat drawing process. The fibers were filled with carbon nanotubes (CNTs) to improve the strength and reduce plastic deformation. The crystallinity, degree of orientation, mechanical properties (strength to yield, strength to break, elongation at break, and initial modulus), electrical conductivity, and thermal properties of LLDPE fibers were studied. The results show that the addition of CNTs improved the tensile strength and the degree of crystallinity. The heat drawing process resulted in a significant increase in the tensile strength and the orientation of the CNTs and polymer chains. In addition, this study demonstrates that the heat drawing process effectively decreases the plastic deformation of LLDPE.

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Processing and characterization of polyethylene-based composites

Cited by 146 publications

References 111 publications

Melt processing and characterisation of polyamide 6/graphene nanoplatelet composites

Melt processing and characterisation of polyamide 6/graphene nanoplatelet composites

Novel high‐density polyethylene‐niobium pentoxide dielectric materials

Effect of Heat Drawing Process on Mechanical Properties of Dry-Jet Wet Spun Fiber of Linear Low Density Polyethylene/Carbon Nanotube Composites

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