Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) Networks

Autores
Vega, Daniel Alberto; Villar, Marcelo Armando; Valles, Enrique Marcelo; Steren, Carlos Alberto; Monti, Gustavo Alberto
Año de publicación
2001
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We have estimated the mass fraction of elastic and pendant chains of model poly- (dimethylsiloxane) (PDMS) networks using transverse proton relaxation in nuclear magnetic resonance (1H NMR). These experiments were compared with theoretical estimations of the mass fraction of pendant chains predicted by mean-field calculations (MFC). A recursive approach, originally postulated by Miller and Macosko and extended by the authors to obtain information on several molecular parameters related to the molecular structure of the pendant chains, was employed for the theoretical calculations. A preliminary inspection of the results showed that proton relaxation measurements underestimate the mass fraction of pendant material. We speculate that trapped entanglements, in which long pendant chains are involved, may act as temporary cross-linking points in the time scale of the 1H NMR experiments. In this condition only portions of the pendant chains would be detectable by the experiments, justifying the observed differences between proton relaxation experiments and the MFC results. To verify this presumption, we formulated a modification of the recursive calculations to estimate the amount of entanglements in which pendant chains are involved. If entanglements are taken into consideration, a very good agreement between theoretical mass fraction of pendant chains calculated by the modified MFC and experimental values determined from proton relaxation is obtained.
Fil: Vega, Daniel Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Villar, Marcelo Armando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Valles, Enrique Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Steren, Carlos Alberto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Monti, Gustavo Alberto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
Model Poly(Dimethylsiloxane) (Pdms) Networks
Transverse Proton Relaxation
Nuclear Magnetic Resonance (1h Nmr)
Pendant Chains
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/38071
Acceder
id CONICETDig_ef5313aec859e9e9acfc29f30ec3e162
oai_identifier_str oai:ri.conicet.gov.ar:11336/38071
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) NetworksVega, Daniel AlbertoVillar, Marcelo ArmandoValles, Enrique MarceloSteren, Carlos AlbertoMonti, Gustavo AlbertoModel Poly(Dimethylsiloxane) (Pdms) NetworksTransverse Proton RelaxationNuclear Magnetic Resonance (1h Nmr)Pendant Chainshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We have estimated the mass fraction of elastic and pendant chains of model poly- (dimethylsiloxane) (PDMS) networks using transverse proton relaxation in nuclear magnetic resonance (1H NMR). These experiments were compared with theoretical estimations of the mass fraction of pendant chains predicted by mean-field calculations (MFC). A recursive approach, originally postulated by Miller and Macosko and extended by the authors to obtain information on several molecular parameters related to the molecular structure of the pendant chains, was employed for the theoretical calculations. A preliminary inspection of the results showed that proton relaxation measurements underestimate the mass fraction of pendant material. We speculate that trapped entanglements, in which long pendant chains are involved, may act as temporary cross-linking points in the time scale of the 1H NMR experiments. In this condition only portions of the pendant chains would be detectable by the experiments, justifying the observed differences between proton relaxation experiments and the MFC results. To verify this presumption, we formulated a modification of the recursive calculations to estimate the amount of entanglements in which pendant chains are involved. If entanglements are taken into consideration, a very good agreement between theoretical mass fraction of pendant chains calculated by the modified MFC and experimental values determined from proton relaxation is obtained.Fil: Vega, Daniel Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Villar, Marcelo Armando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Valles, Enrique Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Steren, Carlos Alberto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Monti, Gustavo Alberto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaAmerican Chemical Society2001-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/38071Vega, Daniel Alberto; Villar, Marcelo Armando; Valles, Enrique Marcelo; Steren, Carlos Alberto; Monti, Gustavo Alberto; Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) Networks; American Chemical Society; Macromolecules; 34; 2; 1-2001; 283-2880024-9297CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1021/ma0000172info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/abs/10.1021/ma0000172info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:21:18Zoai:ri.conicet.gov.ar:11336/38071instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:21:18.37CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) Networks
title Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) Networks
spellingShingle Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) Networks
Vega, Daniel Alberto
Model Poly(Dimethylsiloxane) (Pdms) Networks
Transverse Proton Relaxation
Nuclear Magnetic Resonance (1h Nmr)
Pendant Chains
title_short Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) Networks
title_full Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) Networks
title_fullStr Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) Networks
title_full_unstemmed Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) Networks
title_sort Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) Networks
dc.creator.none.fl_str_mv Vega, Daniel Alberto
Villar, Marcelo Armando
Valles, Enrique Marcelo
Steren, Carlos Alberto
Monti, Gustavo Alberto
author Vega, Daniel Alberto
author_facet Vega, Daniel Alberto
Villar, Marcelo Armando
Valles, Enrique Marcelo
Steren, Carlos Alberto
Monti, Gustavo Alberto
author_role author
author2 Villar, Marcelo Armando
Valles, Enrique Marcelo
Steren, Carlos Alberto
Monti, Gustavo Alberto
author2_role author
author
author
author
dc.subject.none.fl_str_mv Model Poly(Dimethylsiloxane) (Pdms) Networks
Transverse Proton Relaxation
Nuclear Magnetic Resonance (1h Nmr)
Pendant Chains
topic Model Poly(Dimethylsiloxane) (Pdms) Networks
Transverse Proton Relaxation
Nuclear Magnetic Resonance (1h Nmr)
Pendant Chains
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We have estimated the mass fraction of elastic and pendant chains of model poly- (dimethylsiloxane) (PDMS) networks using transverse proton relaxation in nuclear magnetic resonance (1H NMR). These experiments were compared with theoretical estimations of the mass fraction of pendant chains predicted by mean-field calculations (MFC). A recursive approach, originally postulated by Miller and Macosko and extended by the authors to obtain information on several molecular parameters related to the molecular structure of the pendant chains, was employed for the theoretical calculations. A preliminary inspection of the results showed that proton relaxation measurements underestimate the mass fraction of pendant material. We speculate that trapped entanglements, in which long pendant chains are involved, may act as temporary cross-linking points in the time scale of the 1H NMR experiments. In this condition only portions of the pendant chains would be detectable by the experiments, justifying the observed differences between proton relaxation experiments and the MFC results. To verify this presumption, we formulated a modification of the recursive calculations to estimate the amount of entanglements in which pendant chains are involved. If entanglements are taken into consideration, a very good agreement between theoretical mass fraction of pendant chains calculated by the modified MFC and experimental values determined from proton relaxation is obtained.
Fil: Vega, Daniel Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Villar, Marcelo Armando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Valles, Enrique Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Steren, Carlos Alberto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Monti, Gustavo Alberto. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description We have estimated the mass fraction of elastic and pendant chains of model poly- (dimethylsiloxane) (PDMS) networks using transverse proton relaxation in nuclear magnetic resonance (1H NMR). These experiments were compared with theoretical estimations of the mass fraction of pendant chains predicted by mean-field calculations (MFC). A recursive approach, originally postulated by Miller and Macosko and extended by the authors to obtain information on several molecular parameters related to the molecular structure of the pendant chains, was employed for the theoretical calculations. A preliminary inspection of the results showed that proton relaxation measurements underestimate the mass fraction of pendant material. We speculate that trapped entanglements, in which long pendant chains are involved, may act as temporary cross-linking points in the time scale of the 1H NMR experiments. In this condition only portions of the pendant chains would be detectable by the experiments, justifying the observed differences between proton relaxation experiments and the MFC results. To verify this presumption, we formulated a modification of the recursive calculations to estimate the amount of entanglements in which pendant chains are involved. If entanglements are taken into consideration, a very good agreement between theoretical mass fraction of pendant chains calculated by the modified MFC and experimental values determined from proton relaxation is obtained.
publishDate 2001
dc.date.none.fl_str_mv 2001-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/38071
Vega, Daniel Alberto; Villar, Marcelo Armando; Valles, Enrique Marcelo; Steren, Carlos Alberto; Monti, Gustavo Alberto; Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) Networks; American Chemical Society; Macromolecules; 34; 2; 1-2001; 283-288
0024-9297
CONICET Digital
CONICET
url http://hdl.handle.net/11336/38071
identifier_str_mv Vega, Daniel Alberto; Villar, Marcelo Armando; Valles, Enrique Marcelo; Steren, Carlos Alberto; Monti, Gustavo Alberto; Comparison of Mean-Field Theory and 1 H NMR Transversal Relaxation of Poly(dimethylsiloxane) Networks; American Chemical Society; Macromolecules; 34; 2; 1-2001; 283-288
0024-9297
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1021/ma0000172
info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/abs/10.1021/ma0000172
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Chemical Society
publisher.none.fl_str_mv American Chemical Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1844614200865849344
score 13.070432

Publicaciones similares