The effect of high-energy electron beam on mechanical and thermal properties of LDPE and HDPE

Gheysari, Dj; Behjat, Abbas; Haji‐Saeid, M.

doi:10.1016/s0014-3057(00)00122-1

Cited by 97 publications

(71 citation statements)

References 12 publications

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“…Nowadays, over 800 electron beam plants are in operation in the treatment of polymer products in the world. [8] Under the action of b-radiation ethylene-propylene elastomers are able to crosslink, attaining proper crosslinking levels with minimum degrees of oxidation. [8][9][10][11] Therefore, in this study we focus on the characterization of metallocene EPDMs crosslinked by a typical and wellknown method, such as peroxide initiation, and we compare those results with those obtained by b-radiation.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Metallocene Epdm Terpolymers with High Diene and Propylene Content Crosslinked by Dicumyl Peroxide and β‐Radiation

Nicolás

Ressia

Vallés

et al. 2004

Macro Chemistry & Physics

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Summary: Two metallocene EPDMs with the same weight fraction of ethylene but differing in diene content were crosslinked, either by dicumyl peroxide (DCP) or β‐radiation. The effect of different diene and propylene content on the molecular structure and the mechanical properties once the materials were crosslinked was studied. The final gel content was very high due to the large level of unsaturations. The crosslinking process was monitored by FTIR spectroscopy by following the decay of unsaturations and the variation of the carbonyl groups that are related to the oxidation grade. It was found that β‐radiation crosslinked samples exhibited a lower oxidation grade than those crosslinked by DCP. An oscillant disc rheometer was employed to follow the evolution of the rheological properties, the scorch time, and the time corresponding to full cure during the crosslinking reaction with DCP. In addition, in order to characterize the state of cure we have studied the rheological properties in shear employing a dynamic parallel plate geometry. These results were correlated with those obtained from the molecular characterization of the soluble fraction by size exclusion chromatography. The experiments indicate that, at low irradiation doses, there is a high rate of chain scission reactions that cause an important decrease in storage modulus. Whereas, at high irradiation doses the rate of chain scission reactions diminishes, thus the storage modulus increases but it still remains at lower levels than those corresponding to the original terpolymers. The tensile properties, hardness (Shore A) and compression set tests also suggest the presence of chain scission reactions.Storage modulus (G′) versus frequency for a β‐irradiated sample.magnified imageStorage modulus (G′) versus frequency for a β‐irradiated sample.

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Section: Introductionmentioning

confidence: 99%

Characterization of Metallocene Epdm Terpolymers with High Diene and Propylene Content Crosslinked by Dicumyl Peroxide and β‐Radiation

Nicolás

Ressia

Vallés

et al. 2004

Macro Chemistry & Physics

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“…The mechanical properties of tensile strength (TS) and elongation at break (EB) were measured on dumbbell specimens according to ASTM D638 in a SANTAM DBBP-500 MODEL machine at test speed of 50mm/min (17,18) . In this project attenuation of the borated polyethylene nano-composite and pure polyethylene shields were compared using polycarbonate #ilm dosimetry.…”

Section: Methodsmentioning

confidence: 99%

Design and fabrication of high density borated polyethylene nanocomposites as a neutron shield

Mortazavi

Kardan

Sina

et al. 2016

IJRR

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“…The radiation crosslinking of low-density polyethylene (LDPE) irradiated under the 5 and 10 MeV electron beams in the wide range dose was previously investigated [11][12][13][14][15]. The effects of high energy electron beams on mechanical and thermal properties of LDPE have been reported as well [16]. The electrical properties of plastics are measured to determine the performance capability in electrical applications, evaluate characteristics other than electrical, provide quality assurance, serve as a means of identification and as a research tool, and provide a basis for the buyer-seller relationship [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Storing Effects on Electrical Properties of High Energy Electron Beam Irradiated LDPE and HDPE

Ziaie

Borhani

Shamekhi

2011

International Journal of Polymeric Materials

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In this work, the effect of storing time on the variation of surface and volume resistance of the 10 MeV electron beam irradiated LDPE and HDPE samples was investigated. This study was carried out about one month after irradiation. The samples were prepared in sheet form with thickness of 2 AE 0.1 mm and irradiated at the doses of 70 to 370 kGy. All the samples were kept at room temperature. The results show a peak at about 25 days after irradiation in surface resistance for all the samples. The volume resistance measurements did not show any significant variation.

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The effect of high-energy electron beam on mechanical and thermal properties of LDPE and HDPE

Cited by 97 publications

References 12 publications

Characterization of Metallocene Epdm Terpolymers with High Diene and Propylene Content Crosslinked by Dicumyl Peroxide and β‐Radiation

Characterization of Metallocene Epdm Terpolymers with High Diene and Propylene Content Crosslinked by Dicumyl Peroxide and β‐Radiation

Design and fabrication of high density borated polyethylene nanocomposites as a neutron shield

Storing Effects on Electrical Properties of High Energy Electron Beam Irradiated LDPE and HDPE

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