eprintid: 3679
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/36/79
datestamp: 2023-11-09 15:51:56
lastmod: 2023-11-09 15:51:56
status_changed: 2023-11-09 15:47:23
type: article
metadata_visibility: show
creators_name: Sabet, M.
creators_name: Hassan, A.
creators_name: Ratnam, C.T.
title: Electron-beam irradiation of low density polyethylene/ethylene vinyl acetate blends
ispublished: pub
keywords: Degree of cross-linking; Dielectric loss factors; Electron-beam irradiations; Ethylene vinyl acetates; Irradiation crosslinking; Low density polyethylene(LDPE); Strength and elongations; Thermal gravimetric analyses (TGA), Blending; Capillary flow; Crosslinking; Degradation; Elongation; Low density polyethylenes; Radiation; Specific heat; Tensile strength; Thermal aging; Thermal conductivity; Thermogravimetric analysis, Irradiation
note: cited By 15
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. © 2013 Walter de Gruyter GmbH & Co. KG, Berlin/Boston.
date: 2013
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84881646633&doi=10.1515%2fpolyeng-2012-0132&partnerID=40&md5=74c1a79a9bab8a71dd530396b9918320
id_number: 10.1515/polyeng-2012-0132
full_text_status: none
publication: Journal of Polymer Engineering
volume: 33
number: 2
pagerange: 149-161
refereed: TRUE
issn: 03346447
citation:   Sabet, M. and Hassan, A. and Ratnam, C.T.  (2013) Electron-beam irradiation of low density polyethylene/ethylene vinyl acetate blends.  Journal of Polymer Engineering, 33 (2).  pp. 149-161.  ISSN 03346447