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

doi:10.1016/j.radphyschem.2013.06.031

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 journal › Article › peer-review

6 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 language	English
Pages (from-to)	31-35
Number of pages	5
Journal	Radiation Physics and Chemistry
Volume	94
Issue number	1
DOIs	https://doi.org/10.1016/j.radphyschem.2013.06.031
Publication status	Published - Jan 2014
Event	10th Meeting of the Ionizing Radiation and Polymers (IRAP) - Krakow, Poland Duration: 14 Oct 2012 → 19 Oct 2012 Conference number: 10th

Keywords

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

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title = "Evidence of structural order recovery in LDPE based copolymers prepared by gamma irradiation",

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.",

keywords = "Graft copolymers, Gamma radiation, Polymers for bioapplications, Membranes for catalytic processes, FUNCTIONALIZED MEMBRANES, POLYMERIC MEMBRANES, RADIATION, FILMS",

author = "Ferreira, {Lu{\'i}s M.} and Leal, {J. P.} and Casimiro, {M. H.} and C. Cruz and Lancastre, {J. J. H.} and Falc{\~a}o, {A. N.}",

note = "The authors acknowledge the Funda{\c c}{\~a}o para a Ci{\^e}ncia e a Tecnologia for financial support through the project PTDC/CTM-POL/114579/2009 and Grant SFRH/BPD/26961/2006.; 10th Meeting of the Ionizing Radiation and Polymers (IRAP), IRAP ; Conference date: 14-10-2012 Through 19-10-2012",

year = "2014",

month = jan,

doi = "10.1016/j.radphyschem.2013.06.031",

language = "English",

volume = "94",

pages = "31--35",

journal = "Radiation Physics and Chemistry",

issn = "0969-806X",

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number = "1",

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T1 - Evidence of structural order recovery in LDPE based copolymers prepared by gamma irradiation

AU - Ferreira, Luís M.

AU - Leal, J. P.

AU - Casimiro, M. H.

AU - Cruz, C.

AU - Lancastre, J. J. H.

AU - Falcão, A. N.

N1 - Conference code: 10th

PY - 2014/1

Y1 - 2014/1

N2 - 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.

AB - 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.

KW - Graft copolymers

KW - Gamma radiation

KW - Polymers for bioapplications

KW - Membranes for catalytic processes

KW - FUNCTIONALIZED MEMBRANES

KW - POLYMERIC MEMBRANES

KW - RADIATION

KW - FILMS

U2 - 10.1016/j.radphyschem.2013.06.031

DO - 10.1016/j.radphyschem.2013.06.031

M3 - Article

SN - 0969-806X

VL - 94

SP - 31

EP - 35

JO - Radiation Physics and Chemistry

JF - Radiation Physics and Chemistry

IS - 1

T2 - 10th Meeting of the Ionizing Radiation and Polymers (IRAP)

Y2 - 14 October 2012 through 19 October 2012

ER -

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

Abstract

Keywords

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