Monitoring polyolefin modification along the axis of a twin-screw extruder. II. maleic anhydride grafting
Autor(a) principal: | |
---|---|
Data de Publicação: | 2000 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | https://hdl.handle.net/1822/86895 |
Resumo: | The physico-chemical phenomena developing along the screw axis of a twin-screw extruder during the grafting of maleic anhydride (MA) onto polyolefins [polyethylene (PE), ethylene–propylene rubber (EPM), and polypropylene (PP)] were investigated. For this purpose, sampling devices located along the extruder barrel were used to collect polymer samples that were subsequently characterized to follow the degrees of grafting and crosslinking or degradation. A similar evolution of MA grafting was observed regardless of the polyolefin type or MA and peroxide concentration when grafting was performed under identical conditions, that is, the same peroxide type and set temperature. A correlation between the MA grafting and the calculated peroxide decomposition was established. Chemical reactions occurred along the extruder axis until the peroxide was fully converted. More detailed quantitative measurements of the peroxide decomposition and MA grafting would allow the development of accurate process models. The final MA content depended on the polyolefin composition (PE > EPM ≫ PP). As expected for PE, crosslinking occurred in addition to grafting, but after a certain residence time, the PE network degraded. The PP viscosity reduction after MA grafting was due to the conversion of tertiary PP radicals into primary PP radicals after grafting. |
id |
RCAP_ee181c29d7187aff66ea2b2e27f063a0 |
---|---|
oai_identifier_str |
oai:repositorium.sdum.uminho.pt:1822/86895 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Monitoring polyolefin modification along the axis of a twin-screw extruder. II. maleic anhydride graftingreactive processingmodificationmaleic anhydriderheologyScience & TechnologyThe physico-chemical phenomena developing along the screw axis of a twin-screw extruder during the grafting of maleic anhydride (MA) onto polyolefins [polyethylene (PE), ethylene–propylene rubber (EPM), and polypropylene (PP)] were investigated. For this purpose, sampling devices located along the extruder barrel were used to collect polymer samples that were subsequently characterized to follow the degrees of grafting and crosslinking or degradation. A similar evolution of MA grafting was observed regardless of the polyolefin type or MA and peroxide concentration when grafting was performed under identical conditions, that is, the same peroxide type and set temperature. A correlation between the MA grafting and the calculated peroxide decomposition was established. Chemical reactions occurred along the extruder axis until the peroxide was fully converted. More detailed quantitative measurements of the peroxide decomposition and MA grafting would allow the development of accurate process models. The final MA content depended on the polyolefin composition (PE > EPM ≫ PP). As expected for PE, crosslinking occurred in addition to grafting, but after a certain residence time, the PE network degraded. The PP viscosity reduction after MA grafting was due to the conversion of tertiary PP radicals into primary PP radicals after grafting.The authors are grateful to DSM Research (the Neth erlands) for materials and technical support, to Exxon (Spain) for materials, and to Invotan for financial sup port. Marcus Bulters of DSM Research is acknowledged for useful discussions.John Wiley & Sons IncUniversidade do MinhoMachado, A. V.Covas, J. A.van Duin, M.2000-09-202000-09-20T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/1822/86895engMachado, A. V., van Duin, M., & Covas, J. A. (2000). Monitoring polyolefin modification along the axis of a twin-screw extruder. II. Maleic anhydride grafting. Journal of Polymer Science Part A: Polymer Chemistry. Wiley. http://doi.org/10.1002/1099-0518(20001101)38:21<3919::aid-pola90>3.0.co;2-l0887-624X2642-416910.1002/1099-0518(20001101)38:21<3919::AID-POLA90>3.0.CO;2-Lhttps://onlinelibrary.wiley.com/doi/10.1002/1099-0518(20001101)38:21%3C3919::AID-POLA90%3E3.0.CO;2-Linfo: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:RCAAP2023-12-23T01:38:54Zoai:repositorium.sdum.uminho.pt:1822/86895Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:39:04.268755Repositório 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 |
Monitoring polyolefin modification along the axis of a twin-screw extruder. II. maleic anhydride grafting |
title |
Monitoring polyolefin modification along the axis of a twin-screw extruder. II. maleic anhydride grafting |
spellingShingle |
Monitoring polyolefin modification along the axis of a twin-screw extruder. II. maleic anhydride grafting Machado, A. V. reactive processing modification maleic anhydride rheology Science & Technology |
title_short |
Monitoring polyolefin modification along the axis of a twin-screw extruder. II. maleic anhydride grafting |
title_full |
Monitoring polyolefin modification along the axis of a twin-screw extruder. II. maleic anhydride grafting |
title_fullStr |
Monitoring polyolefin modification along the axis of a twin-screw extruder. II. maleic anhydride grafting |
title_full_unstemmed |
Monitoring polyolefin modification along the axis of a twin-screw extruder. II. maleic anhydride grafting |
title_sort |
Monitoring polyolefin modification along the axis of a twin-screw extruder. II. maleic anhydride grafting |
author |
Machado, A. V. |
author_facet |
Machado, A. V. Covas, J. A. van Duin, M. |
author_role |
author |
author2 |
Covas, J. A. van Duin, M. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Machado, A. V. Covas, J. A. van Duin, M. |
dc.subject.por.fl_str_mv |
reactive processing modification maleic anhydride rheology Science & Technology |
topic |
reactive processing modification maleic anhydride rheology Science & Technology |
description |
The physico-chemical phenomena developing along the screw axis of a twin-screw extruder during the grafting of maleic anhydride (MA) onto polyolefins [polyethylene (PE), ethylene–propylene rubber (EPM), and polypropylene (PP)] were investigated. For this purpose, sampling devices located along the extruder barrel were used to collect polymer samples that were subsequently characterized to follow the degrees of grafting and crosslinking or degradation. A similar evolution of MA grafting was observed regardless of the polyolefin type or MA and peroxide concentration when grafting was performed under identical conditions, that is, the same peroxide type and set temperature. A correlation between the MA grafting and the calculated peroxide decomposition was established. Chemical reactions occurred along the extruder axis until the peroxide was fully converted. More detailed quantitative measurements of the peroxide decomposition and MA grafting would allow the development of accurate process models. The final MA content depended on the polyolefin composition (PE > EPM ≫ PP). As expected for PE, crosslinking occurred in addition to grafting, but after a certain residence time, the PE network degraded. The PP viscosity reduction after MA grafting was due to the conversion of tertiary PP radicals into primary PP radicals after grafting. |
publishDate |
2000 |
dc.date.none.fl_str_mv |
2000-09-20 2000-09-20T00:00:00Z |
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 |
https://hdl.handle.net/1822/86895 |
url |
https://hdl.handle.net/1822/86895 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Machado, A. V., van Duin, M., & Covas, J. A. (2000). Monitoring polyolefin modification along the axis of a twin-screw extruder. II. Maleic anhydride grafting. Journal of Polymer Science Part A: Polymer Chemistry. Wiley. http://doi.org/10.1002/1099-0518(20001101)38:21<3919::aid-pola90>3.0.co;2-l 0887-624X 2642-4169 10.1002/1099-0518(20001101)38:21<3919::AID-POLA90>3.0.CO;2-L https://onlinelibrary.wiley.com/doi/10.1002/1099-0518(20001101)38:21%3C3919::AID-POLA90%3E3.0.CO;2-L |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
John Wiley & Sons Inc |
publisher.none.fl_str_mv |
John Wiley & Sons Inc |
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) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
_version_ |
1799133651469860864 |