scholarly journals Effect of Crystallinity of Polyethylene with Different Densities on Breakdown Strength and Conductance Property

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1746 ◽  
Author(s):  
Dawei Li ◽  
Liwei Zhou ◽  
Xuan Wang ◽  
Lijuan He ◽  
Xiong Yang
Keyword(s):  
Field Strength ◽  
Continuous Improvement ◽  
High Density Polyethylene ◽  
Breakdown Strength ◽  
Characteristic Curve ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
X Ray Diffraction ◽  
X Ray

In order to study the effects of the crystallinity of polyethylene with different densities on breakdown strength and conductance properties, this paper mainly tests the X-ray diffraction (XRD), different scanning calorimeter (DSC), direct current (DC) breakdown and conductance properties of low-density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high-density polyethylene (HDPE), and further analyzes the experimental results separately. The results show that an increase in the density of polyethylene leads to the continuous improvement of crystallinity, and an increase in crystallinity causes a significant decrease in the conduction current at the same field strength. The field strength corresponding to the two turning points in the conductance characteristic curve increases simultaneously.

Preparation of Linear Low-Density Polyethylene-g-Poly(Acrylic Acid)-Co-Starch Hydrogel

2014 ◽  
Vol 1024 ◽  
pp. 163-166
Author(s):  
Maryam Irani ◽  
Hanafi Ismail ◽  
Zulkifli Ahmad
Keyword(s):  
Acrylic Acid ◽  
Low Density Polyethylene ◽  
Water Absorbency ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Electron Micrograph ◽  
X Ray Diffraction ◽  
Scanning Electron Micrograph ◽  
X Ray ◽  
Maximum Water

In this work, a type of hydrogel from waste linear low density polyethylene (LLDPE), acrylic acid (AA), and starch was prepared using N, N-methylenebisacrylamide (MBA) as the crosslinker, and benzoyl peroxide as the initiator. The hydrogel was characterized by Fourier transform infrared spectroscope (FTIR), scanning electron micrograph (SEM), and X-ray diffraction (XRD). The results confirmed the incorporation of acrylic acid and starch in the LLDPE chain. SEM results show that the prepared hydrogel has a porous structure. Product showed maximum water absorbency of 180 g/g in distilled water.

Oxidized Wax as Compatibilizer in Linear Low-Density Polyethylene-Clay Nanocomposites: X-ray Diffraction and Dynamic Mechanical Analysis

2008 ◽  
Vol 8 (4) ◽  
pp. 1886-1894 ◽  
Author(s):  
V. G. Geethamma ◽  
Adriaan S. Luyt
Keyword(s):  
Loss Modulus ◽  
Mechanical Analysis ◽  
Low Density Polyethylene ◽  
Clay Nanocomposites ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dynamic Mechanical ◽  
Storage And Loss Moduli

Oxidized paraffin wax was used as a compatibilizer in composites of linear low-density polyethylene and layered nano silicate clays. X-ray diffraction analyses were carried out to investigate the crystalline morphology of five types of clays, oxidized wax, and their composites with LLDPE. The composites exhibited different X-ray diffraction and dynamic mechanical behaviour in the presence of different clays. Generally, the composites retained the partially crystalline behaviour of LLDPE, and no exfoliation was observed. Increased amount of wax did not change the morphology in most cases. The incorporation of clay resulted in an observable increase in the storage modulus of LLDPE. These values also increased with the addition of oxidized wax for most of the composites. The loss modulus increased with the amount of clay, irrespective of its nature. In most cases these values also increased with the incorporation of wax. The composites with 10% clay and 10% oxidized wax showed the highest storage and loss moduli, irrespective of the nature of the clay. The tan δ values did not change considerably with the addition of clay or wax.

scholarly journals Study on the effect of modified clay on the properties of high density polyethylene and Vietnamese starch blend

2013 ◽  
Vol 16 (4) ◽  
pp. 34-44
Author(s):  
Mao Dang Nguyen ◽  
Trung Tien Vu ◽  
Huy Thuc Ha ◽  
Nhan Thuc Chi Ha
Keyword(s):  
High Density Polyethylene ◽  
Testing Machine ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Thermal And Mechanical Properties ◽  
X Ray Diffraction ◽  
Electronic Microscopy ◽  
Melting Method ◽  
X Ray ◽  
The Matrix

This study focuses on the preparation of organoclay by intercalating the new kind of modifying agent, monoglyceride (M-Gly), into the Vietnamese Na-saturated montmorillonite (Na-MMT) layers. The modification of clay was conducted in using internal thermo Hakee mixer with high shear rate which gave the obviously expansion of the layer galleries of clay, in having the dspacing more than 60Å showed by X-ray diffraction (XRD). The Low density polyethylene (LDPE)/thermal plastic starch (TPS) blend has been studied to prepare the green nanocomposite material in using the montmorillonite clay as the reinforced phase. The mixtures of LDPE/TPS/ montmorillonite nanocomposites have been elaborated by melting method at 1600C in 5 minutes. The nanocomposite morphology was investigated by X-Ray Diffraction (XRD) and Transmission Electronic Microscopy (TEM), and the results have shown the good dispersion of clay in the matrix polymer blend. As result, the thermal and mechanical properties of material are also enhanced when the claywas added. By mechanical testing machine showed tensile strength and modules of the mixture increased and good result in 3%wt of organoclay, which have shown interface adhesion between components so good in mixture

Thermal Diffusivity of Copper/Linear-low-density Polyethylene Composites

2017 ◽  
Vol 25 (6) ◽  
pp. 447-452
Author(s):  
James K. Carson ◽  
Mohamed Alsowailem
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
High Density Polyethylene ◽  
Relative Increase ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Capacity Data ◽  
Thermal Diffusivities ◽  
Polyethylene Composites

The thermal diffusivities of copper/linear-low-density polyethylene (Cu/LLDPE) composites were measured relative to the thermal diffusivity of pure LLDPE. The relative thermal diffusivities were similar to those obtained for copper/high-density polyethylene composites, but were noticeably different from estimated values derived from thermal conductivity, density and specific heat capacity data for Cu/LLDPE from the literature. The thermal diffusivity of the composite material initially decreased below that of the pure polymer with the addition of a small amount of copper, before increasing above it as more was added. There would appear to be marginal or no benefit from adding less than about 15 to 20% metal by volume to a polymer, since the relative increase in thermal diffusivity only becomes significant for greater volumes.

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