New Thermoplastic Elastomers from Poly(Ethylene-Octene) (Engage), Poly(Ethylene-Vinyl Acetate) and Low-Density Polyethylene by Electron Beam Technology: Structural Characterization and Mechanical Properties

2001 ◽  
Vol 74 (5) ◽  
pp. 815-833 ◽  
Author(s):  
S. Chattopadhyay ◽  
T. K. Chaki ◽  
Anil K. Bhowmick
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Vinyl Acetate ◽  
Structural Changes ◽  
Ethylene Vinyl Acetate ◽  
Thermoplastic Elastomers ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Dynamic Mechanical ◽  
Poly Ethylene

Abstract New thermoplastic elastomers have been prepared from the blends of metallocene-based polyolefins (Engage) with low-density polyethylene (LDPE), and ethylene-vinyl acetate copolymers (EVA) of different grades with LDPE by electron beam modification. Structural changes of these blends with or without sensitizer in presence of irradiation have been evaluated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Scanning electron microscopy (SEM) in conjunction with atomic force microscopy (AFM) indicate the soft rubber domain in the continuous plastic matrix. Significant improvements of mechanical, dynamic mechanical and set properties have been obtained by electron beam modification, retaining its reprocessibility characteristics. Effects of ditrimethylol propane tetraacrylate (DTMPTA) as radiation sensitizer have also been evaluated from the mechanical, dynamic mechanical properties and reprocessibility.

scholarly journals Crystallization in the Thin and Ultrathin Films of Poly(ethylene-vinyl acetate) and Linear Low-Density Polyethylene

2005 ◽  
Vol 38 (5) ◽  
pp. 2022-2022 ◽  
Author(s):  
S. Ge ◽  
M. Rafailovich ◽  
J. Sokolov ◽  
Y. Zou ◽  
H. Ade ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Ultrathin Films ◽  
Ethylene Vinyl Acetate ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Poly Ethylene

scholarly journals Influence of Ethylene Plasma Treatment of Agave Fiber on the Cellular Morphology and Compressive Properties of Low-Density Polyethylene/Ethylene Vinyl Acetate Copolymer/Agave Fiber Composite Foams

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
F. Soriano-Corral ◽  
L. A. Calva-Nava ◽  
J. F. Hernández-Gámez ◽  
E. Hernández-Hernández ◽  
P. González-Morones ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plasma Treatment ◽  
Vinyl Acetate ◽  
Fiber Composite ◽  
Ethylene Vinyl Acetate ◽  
Cellular Morphology ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Neat Polymer ◽  
Composite Foams

Agave fibers (AF) were incorporated either pristine (AFp) or surface treated by ethylene plasma (AFm) in low-density polyethylene (LDPE)/ethylene vinyl acetate (EVA) blends at a ratio of 1 : 1 and foamed by chemical means. The role of the AF content (3, 6, 9, 12, and 15 wt.%) and its surface modification on the cellular morphology and mechanical properties of LDPE/EVA/AF foams under compression is investigated herein. Fourier transform-infrared spectroscopy, contact angle, and water suspension of AF suggest that plasma treatment using ethylene successfully modifies the surface nature of AF from hydrophilic to hydrophobic. AF and the surface treatment have an important role on the morphological properties of the foams. Composite foams reinforced with 12 wt.% AFm exhibited the highest mechanical properties improvements. At this fiber content, the composite foams enhanced 30% of the compressive modulus and 23% of the energy absorption under compression with respect to the neat polymer blend foam, as a result to the formation of more uniform cells with smaller size and the enhancement of compatibility and spatial distribution of the AFm in the polymer composite foams due to thin clusters of polyethylene-like polymer deposited on the AF surface.

Study of heat shrinkability of crosslinked low-density polyethylene/poly(ethylene vinyl acetate) blends

2004 ◽  
Vol 91 (3) ◽  
pp. 1389-1395 ◽  
Author(s):  
Hossein Ali Khonakdar ◽  
J. Morshedian ◽  
H. Eslami ◽  
F. Shokrollahi
Keyword(s):  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Poly Ethylene

Cross-linked poly(ethylene vinyl acetate) (EVA)/low density polyethylene (LDPE)/metal hydroxides composites for wire and cable applications

2009 ◽  
Vol 64 (6) ◽  
pp. 569-580 ◽  
Author(s):  
Mohammed A. Bahattab ◽  
Jaroslav Mosnáček ◽  
Ahmed A. Basfar ◽  
Tariq M. Shukri
Keyword(s):  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Metal Hydroxides ◽  
Poly Ethylene

Electron-beam irradiation of low density polyethylene/ethylene vinyl acetate blends

2013 ◽  
Vol 33 (2) ◽  
pp. 149-161 ◽  
Author(s):  
Maziyar Sabet ◽  
Azman Hassan ◽  
Chantara Thevy Ratnam
Keyword(s):  
Tensile Strength ◽  
Electron Beam ◽  
Vinyl Acetate ◽  
Electron Beam Irradiation ◽  
Ethylene Vinyl Acetate ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Beam Irradiation ◽  
Elongation At Break ◽  
Gel Content

Abstract In this work, the properties of electron-beam irradiated low density polyethylene (LDPE), ethylene vinyl acetate (EVA) and blends were investigated. EVA addition had an enhancement effect on crosslinking of irradiated LDPE/EVA blends. The measured gel content increase of the blends and the improvement of thermal elongation, tensile strength, elongation at break, thermal aging and heat deformation, have confirmed the positive effects of electron-beam irradiation on the blend properties. The crystallinity of the blends decreased with irradiation. The gel content and hot set tests showed that the degree of crosslinking in the amorphous regions was dependent on the dose and blend composition. Increasing the EVA content resulted in tighter network structures. A significant improvement in the tensile strength of the neat EVA samples was obtained upon electron-beam irradiation up to 210 kGy. The irradiated LDPE/EVA blends showed improved tensile strength and elongation at break, when compared to LDPE. The enhanced irradiation crosslinking of the LDPE/EVA blends was proportional to the good compatibility and the increasing degree of the amorphous region’s content of the LDPE/EVA blends. The possible degradation mechanism of LDPE/EVA blends was discussed quantitatively with a novel method step analysis process of irradiated LDPE/EVA blends in the thermal gravimetric analysis (TGA) technique. It was found, with measuring thermal conductivity (k) and specific heat capacity (Cp) of the blends, that the k values of the LDPE samples at a prescribed temperature range decreased with increasing irradiation. An increase in the crystallinity led to an increase in the k values and a decrease in the Cp values of the LDPE samples. Irradiation below 150 kGy decreased the Cp (at 40°C) and k in average values, whereas increasing the EVA made enhanced the Cp and k values of LDPE/EVA blends at each irradiation. The surface resistance and volume resistivity (VR) of the blends reached a maximum at a 170 kGy irradiation and 30 wt% of EVA. Increasing the amount of EVA contents resulted in enhancement of the dielectric loss factor for the irradiated blends.

Calcium Stearate and Alumina Trihydrate Addition of Irradiated LDPE, EVA and Blends with Electron Beam

2013 ◽  
Vol 290 ◽  
pp. 31-37 ◽  
Author(s):  
Maziyar Sabet ◽  
Mohd Syafiq Bin Anuwar
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Ethylene Vinyl Acetate ◽  
Calcium Stearate ◽  
Low Density Polyethylene ◽  
Cross Linking ◽  
Low Density ◽  
Irradiation Effects ◽  
Polymeric Blends ◽  
Alumina Trihydrate

Irradiation effects on the properties of alumina trihydrate (ATH) / low-density polyethylene (LDPE)/ ethylene vinyl acetate (EVA) / calcium stearate (CS) have been studied and confirmed that EVA and CS addition to the polymeric blends have improved the mechanical properties. ATH addition increased the cross-linking density and improved the blend reinforcing factor but deteriorated the blend mechanical properties. CS addition made ease the ATH dispersion inside polymer matrix. CS addition optimum value in blends was 3 phr and CS addition above 3 phr value deteriorated the blends mechanical properties.

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