Radiation effects on LDPE/EVA blends

Dalai, Siqin; Chen, Wenxiu

doi:10.1002/app.11125

Cited by 59 publications

(34 citation statements)

References 12 publications

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“…[14][15][16][17] The thermal and mechanical behavior of crosslinked polyethylene has been studied most extensively either at room temperature or at temperatures above the melting point of the polymer. [18][19][20][21][22][23] There is very limited available information on the combined effect of the morphology and crosslinking level on the tensile mechanical response of chemically crosslinked polyethylene and its blends with EVA at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

Thermal and mechanical properties of uncrosslinked and chemically crosslinked polyethylene/ethylene vinyl acetate copolymer blends

Khonakdar

Jafari

Asl

et al. 2006

J of Applied Polymer Sci

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Uncrosslinked and chemically crosslinked binary blends of low-and high-density polyethylene (PE), with ethylene vinyl acetate copolymer (EVA), were prepared by a melt-mixing process using 0-3 wt % tert-butyl cumyl peroxide (BCUP). The uncrosslinked blends revealed two distinct unchanged melting peaks corresponding to the individual components of the blends, but with a reduced overall degree of crystallinity. The crosslinking further reduced crystallinity, but enhanced compatibility between EVA and polyethylene, with LDPE being more compatible than HDPE. Blended with 20 wt % EVA, the EVA melting peak was almost disappeared after the addition of BCUP, and only the corresponding PE melting point was observed at a lowered temperature. But blended with 40% EVA, two peaks still existed with a slight shift toward lower temperatures. Changes of mechanical properties with blending ratio, crosslinking, and temperature had been dominated by the extent of crystallinity, crosslinking degree, and morphology of the blend. A good correlation was observed between elongation-at-break and morphological properties. The blends with higher level of compatibility showed less deviation from the additive rule of mixtures. The deviation became more pronounced for HDPE/EVA blends in the phase inversion region, while an opposite trend was observed for LDPE/EVA blends with co-continuous morphology.

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Section: Introductionmentioning

confidence: 99%

Thermal and mechanical properties of uncrosslinked and chemically crosslinked polyethylene/ethylene vinyl acetate copolymer blends

Khonakdar

Jafari

Asl

et al. 2006

J of Applied Polymer Sci

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“…We have estimated the values of the oscillator strength (f ) and the transition dipole moment (μ) for the pristine as well as the irradiated HDPE films using (7) and (9), respectively, whose values are presented in Table 1. The plot of both the oscillator strength and …”

Section: Changes In Optical Propertiesmentioning

confidence: 99%

“…Many experimental investigations revealed that the interaction of ionizing radiations with polymers lead to the excitation and ionization of the atoms and molecules, which cause subsequent rupture of the chemical bonds resulting in the formation of polymer chain fragments and free radicals. These transformations are responsible for most of the physical and/or chemical changes observed in the polymers [5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Electron-Beam-Induced Modifications in High-Density Polyethylene

et al. 2011

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Post-irradiation studies have been carried out to elucidate the effects of electron beam irradiation on the structural, optical, dielectric, and thermal properties of high-density polyethylene (HDPE) films. The experimental results showed that both the optical band gap and activation energy of HDPE films decreases with an increase in the doses of electron radiation. The electrical measurements showed that dielectric constant and the ac conductivity of HDPE increases with an increase in the dose of electron radiation. The thermal analysis carried out using DSC and TGA revealed that the melting temperature, degree of crystallinity, and thermal stability of the HDPE films increased, obviously, due to the predominant cross-linking reaction following high doses of electron irradiation.

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“…The effects of electron beam irradiation and EVA content on the radiation crosslinking in LDPE/EVA blends have been studied by Gordiickuck et al [4], Mateev and Karageogiev [5] and Jamaliah et al [6]. Gamma irradiation effects of both LDPE/EVA and high-density polyethylene (HDPE)/EVA were studied by Dalai et al [7,8] and found that the factors of good compatibility, higher amorphous region's content, and higher EVA content in the blends were favorable with regard to enhance the radiation crosslinking of polyethylene (PE)/EVA blends. The mechanical and thermomechanical properties of gamma irradiated PP/EVA blends were studied by Thomas et al [9] and Minkova and Nikolova [10].…”

Section: Introductionmentioning

confidence: 98%

AC electrical properties of proton irradiated EVA films

et al. 2009

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MeV ions passing through polymeric films modify their electrical, optical and thermal properties and these changes are related to changes in the chemical structure of the polymers. Ethylene vinyl acetate (EVA) films were irradiated with 3 MeV proton beam at different fluences of 10 13 , 10 14 and 10 15 ions/cm 2 . AC electrical properties of pristine and irradiated samples were studied in the frequency range 100 Hz to 100 kHz by means of an LCR meter. There is an exponential increase in conductivity with log frequency and conductivity increases as fluence increases. The dielectric loss/constant is observed to change with the fluence. FTIR spectra reveals significant change in intensities of functional groups at a fluence of 10 15 ions/cm 2 due to scissioning of polymer chains.

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Radiation effects on LDPE/EVA blends

Cited by 59 publications

References 12 publications

Thermal and mechanical properties of uncrosslinked and chemically crosslinked polyethylene/ethylene vinyl acetate copolymer blends

Thermal and mechanical properties of uncrosslinked and chemically crosslinked polyethylene/ethylene vinyl acetate copolymer blends

Electron-Beam-Induced Modifications in High-Density Polyethylene

AC electrical properties of proton irradiated EVA films

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