Modification of LDPE molecular structure by gamma irradiation for bioapplications
Autor(a) principal: | |
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Data de Publicação: | 2005 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/3802 https://doi.org/10.1016/j.nimb.2005.04.030 |
Resumo: | The surface properties of low-density polyethylene (LDPE) can be modified by the grafting of 2-hydroxyethyl methacrylate (HEMA). This was done aiming at the production of new materials suitable for bioapplications. Samples with different monomer concentrations were prepared from LDPE particles by gamma irradiation, following different irradiation protocols, including irradiation in presence and absence of air. The samples were characterized by thermal analysis techniques (DSC and TGA) and by Fourier transform infrared spectroscopy (FTIR). The results obtained show a decrease in the crystallinity of the supporting matrix for copolymers with high yields of grafting. However, the new materials prepared maintain good structural order resulting from the protective effect of polyHEMA grafted onto LDPE backbone. These effects can improve the diffusion of other species deeper inside the matrix and increase the material hydrophilicity. The studies performed made possible the selection of experimental protocols adequate for the production of new copolymeric materials with high grafting yield. These were used in the production of new LDPE films with enhanced hydrophilic properties. |
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7160 |
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Modification of LDPE molecular structure by gamma irradiation for bioapplicationsGraft copolymersGamma radiationPolymer characterizationPolymers for bioapplicationsThe surface properties of low-density polyethylene (LDPE) can be modified by the grafting of 2-hydroxyethyl methacrylate (HEMA). This was done aiming at the production of new materials suitable for bioapplications. Samples with different monomer concentrations were prepared from LDPE particles by gamma irradiation, following different irradiation protocols, including irradiation in presence and absence of air. The samples were characterized by thermal analysis techniques (DSC and TGA) and by Fourier transform infrared spectroscopy (FTIR). The results obtained show a decrease in the crystallinity of the supporting matrix for copolymers with high yields of grafting. However, the new materials prepared maintain good structural order resulting from the protective effect of polyHEMA grafted onto LDPE backbone. These effects can improve the diffusion of other species deeper inside the matrix and increase the material hydrophilicity. The studies performed made possible the selection of experimental protocols adequate for the production of new copolymeric materials with high grafting yield. These were used in the production of new LDPE films with enhanced hydrophilic properties.http://www.sciencedirect.com/science/article/B6TJN-4G7DXV4-Y/1/f2a840cb28d43357b8175d66f67073212005info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/3802http://hdl.handle.net/10316/3802https://doi.org/10.1016/j.nimb.2005.04.030engNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 236:1-4 (2005) 513-520Ferreira, L. M.Falcão, A. N.Gil, M. H.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2020-11-06T16:49:22Zoai:estudogeral.uc.pt:10316/3802Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:59:15.014364Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Modification of LDPE molecular structure by gamma irradiation for bioapplications |
title |
Modification of LDPE molecular structure by gamma irradiation for bioapplications |
spellingShingle |
Modification of LDPE molecular structure by gamma irradiation for bioapplications Ferreira, L. M. Graft copolymers Gamma radiation Polymer characterization Polymers for bioapplications |
title_short |
Modification of LDPE molecular structure by gamma irradiation for bioapplications |
title_full |
Modification of LDPE molecular structure by gamma irradiation for bioapplications |
title_fullStr |
Modification of LDPE molecular structure by gamma irradiation for bioapplications |
title_full_unstemmed |
Modification of LDPE molecular structure by gamma irradiation for bioapplications |
title_sort |
Modification of LDPE molecular structure by gamma irradiation for bioapplications |
author |
Ferreira, L. M. |
author_facet |
Ferreira, L. M. Falcão, A. N. Gil, M. H. |
author_role |
author |
author2 |
Falcão, A. N. Gil, M. H. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Ferreira, L. M. Falcão, A. N. Gil, M. H. |
dc.subject.por.fl_str_mv |
Graft copolymers Gamma radiation Polymer characterization Polymers for bioapplications |
topic |
Graft copolymers Gamma radiation Polymer characterization Polymers for bioapplications |
description |
The surface properties of low-density polyethylene (LDPE) can be modified by the grafting of 2-hydroxyethyl methacrylate (HEMA). This was done aiming at the production of new materials suitable for bioapplications. Samples with different monomer concentrations were prepared from LDPE particles by gamma irradiation, following different irradiation protocols, including irradiation in presence and absence of air. The samples were characterized by thermal analysis techniques (DSC and TGA) and by Fourier transform infrared spectroscopy (FTIR). The results obtained show a decrease in the crystallinity of the supporting matrix for copolymers with high yields of grafting. However, the new materials prepared maintain good structural order resulting from the protective effect of polyHEMA grafted onto LDPE backbone. These effects can improve the diffusion of other species deeper inside the matrix and increase the material hydrophilicity. The studies performed made possible the selection of experimental protocols adequate for the production of new copolymeric materials with high grafting yield. These were used in the production of new LDPE films with enhanced hydrophilic properties. |
publishDate |
2005 |
dc.date.none.fl_str_mv |
2005 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/3802 http://hdl.handle.net/10316/3802 https://doi.org/10.1016/j.nimb.2005.04.030 |
url |
http://hdl.handle.net/10316/3802 https://doi.org/10.1016/j.nimb.2005.04.030 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 236:1-4 (2005) 513-520 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
aplication/PDF |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799133883619344384 |