scholarly journals Three-Phase Characterization of Uniaxially Stretched Linear Low-Density Polyethylene

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Blerina Kolgjini ◽  
Gustaaf Schoukens ◽  
Paul Kiekens
Keyword(s):  
Raman Spectra ◽  
Draw Ratio ◽  
Phase Morphology ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Structure Variation ◽  
X Ray ◽  
Three Phase ◽  
Cold Draw

This study comprises a detailed morphological study of cold-drawn polyethylene monofilaments by Raman spectroscopy, differential scanning calorimetry (DSC) and X-ray measurements. The structure of the three-phase morphology of the linear low-density polyethylene monofilaments was investigated by combining these measurements. It was found that the most important structure variation was found in the intermediate or rigid amorphous phase, whereby the amounts of crystalline and amorphous phases were nearly constant and almost independent of the cold-draw ratio. The intermediate third phase contains gauche and transmolecules, and the amount of transmolecules was increased with the cold-draw ratio and was directly related to this cold-draw ratio. It was found that the two peaks in the Raman spectra, respectively, at 1303 and 1295 cm-1, can be correlated to the amount of gauche and transmolecules in the polyethylene monofilaments. A good and new insight into the three-phase morphology was obtained by combining the DSC and X-ray measurements with the amounts of trans- and gauche molecules from the Raman spectra analysis.

Small- and wide-angle X-ray scattering characterization of 1-hexene linear low-density polyethylene

1995 ◽  
Vol 196 (8) ◽  
pp. 2537-2544 ◽  
Author(s):  
Antonio Marigo ◽  
Gianmatteo Cingano ◽  
Carla Marega ◽  
Roberto Zannetti ◽  
Giuseppe Ferrara ◽  
...  
Keyword(s):  
Low Density Polyethylene ◽  
Low Density ◽  
Wide Angle ◽  
Linear Low Density Polyethylene ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

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.

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