Evidence of structural order recovery in LDPE based copolymers prepared by gamma irradiation

Luís M. Ferreira, J. P. Leal, M. H. Casimiro, C. Cruz, J. J. H. Lancastre, A. N. Falcão

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

PE-g-HEMA films prepared by the mutual gamma irradiation method were prepared to be used as catalyst support in catalytic membrane reactors (CMR). These copolymeric films showed good structural stability, even the high grafted ones, with a consistent correlation between their grafting degree and crystallinity. However, it was observed that above a certain radiation dose threshold, the structural changes induced in polyethylene (PE) backbone do not depend only on the extend of poly(HEMA) graft but also in what seems to be the reorganization of the amorphous regions in the PE matrix. The recovery of some crystallinity (up to 8%) in the copolymeric films was attested by DSC data. FUR analysis confirmed this observation, revealing a slight increase in intensity and definition of the characteristic peak indicator of high crystalline regions in PE. This process seems to result from a radiation protective effect on copolymers matrix carried out by grafted poly(HEMA) which give to PE the ability to recover some of the lost structural order. (C) 2013 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)31-35
Number of pages5
JournalRadiation Physics and Chemistry
Volume94
Issue number1
DOIs
Publication statusPublished - Jan 2014
Event10th Meeting of the Ionizing Radiation and Polymers (IRAP) - Krakow, Poland
Duration: 14 Oct 201219 Oct 2012

Keywords

  • Graft copolymers
  • Gamma radiation
  • Polymers for bioapplications
  • Membranes for catalytic processes
  • FUNCTIONALIZED MEMBRANES
  • POLYMERIC MEMBRANES
  • RADIATION
  • FILMS

Cite this