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Effect of DBPH and vacuum gamma radiation on metallocenic ethylene-1-hexene and ethylene-1-octadecene copolymers

Authors
Journal
Radiation Physics and Chemistry
0969-806X
Publisher
Elsevier
Publication Date
Volume
79
Issue
1
Identifiers
DOI: 10.1016/j.radphyschem.2009.08.008
Keywords
  • Polyethylene Copolymers
  • Gamma Irradiation
  • Mathematical Model
  • Metallocene Catalyst
Disciplines
  • Chemistry
  • Mathematics
  • Physics

Abstract

Effect of DBPH and vacuum gamma radiation on metallocenic ethylene-1-hexene and ethylene-1-octadecene copolymers ia de rm 800 d de nga’’ r pr eth have of e usi ca reactions predominated over scission reactions in all cases. At the same conversion, peroxide modified e by materi st reac s (And ., 2002 1-hexene and 1-octadecene. Metallocene synthesis made possible etry ts for ed to 2. Experimental ARTICLE IN PRESS Contents lists available at ScienceDirect journal homepage: www.elsevi Radiation Physics Radiation Physics and Chemistry 79 (2010) 9–15 Parr reactor with stirring (500 rpm) at 60 1 with an ethylene(C. Sarmoria), [email protected] (E.M. Vall �es). 2.1. Polymerization The polymers shown in Table 1 were synthesized using a 1 l 0969-806X/$ - see front matter & 2009 Elsevier Ltd. All rights reserved. doi:10.1016/j.radphyschem.2009.08.008 � Corresponding author at: Laboratorio de Radioiso´topos, Dpto. de Quı´mica, Universidad Nacional del Sur (UNS), 8000 Bahı´a Blanca, Argentina. Tel.: +54 02914861700281; fax: +5402914861600. E-mail addresses: [email protected] (A.J. Satti), [email protected] (N.A. Andreucetti), [email protected] (R. Quijada), [email protected] the homogeneous distribution of the comonomer along the main temperatures and solvents in the modified polymer. The objective of this work is to compare and analyze the two processes of modification on two different copolymers of the polyethylene family obtained by copolymerization of ethylene with infrared (FTIR) spectroscopy, differential scanning calorim (DSC) and rheology. Also, a mathematical model that accoun scission and crosslinking reactions was implemented and us fit the experimental data. et al., 2003; Satti 2009; Valles et al., 1990) and the chemical modification with agents like the organic peroxides (Gloor et al., 1994; Kwei et al., 1991; P�erez et al., 2002). Both treatments induce the generation of free radicals, which in

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