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dc.contributor.author
Deiber, Julio Alcides
dc.contributor.author
Peirotti, Marta Beatriz
dc.contributor.author
Villar, Marcelo Armando
dc.contributor.author
Ressia, Jorge Aníbal
dc.contributor.author
Valles, Enrique Marcelo
dc.date.available
2017-12-10T22:41:32Z
dc.date.issued
2002-01
dc.identifier.citation
Deiber, Julio Alcides; Peirotti, Marta Beatriz; Villar, Marcelo Armando; Ressia, Jorge Aníbal; Valles, Enrique Marcelo; Linear Viscoelastic Relaxation Modulus of Polydisperse Poly(dimethylsiloxane) Melts Containing Unentangled Chains; Elsevier; Polymer; 43; 1-2002; 3035-3045
dc.identifier.issn
0032-3861
dc.identifier.uri
http://hdl.handle.net/11336/30090
dc.description.abstract
This work analyzes the relationship between the shear relaxation modulus of entangled, linear and flexible homopolymer blends and its molecular weight distribution (MWD) when a fraction of the sample contains chains with molecular weight M lower than the effective critical molecular weight between entanglements Mceff. This effective critical parameter is defined in terms of the critical molecular weight between entanglements Mc of the bulk polymer that forms the physical network and the effective mass fraction Wceff of the unentangled chains. In the terminal zone of the linear viscoelastic response, the double reptation mixing rule for blended entangled chains and a modified law for the relaxation time of chains in a polydisperse matrix are considered, where the effect of chains with M<Mceff is included. Although chain reptation with contour length fluctuations and tube constraint release are still the relevant mechanisms of chain relaxation in the terminal zone when the polydispersity is high, it is found that the presence of a fraction of molecules with M<Mceff modifies substantially the tube constrain release mode of chain relaxation. In this sense, a modified relaxation law for polymer chains in a polydisperse entangled melt that includes the effect of the MWD of unentangled chains is proposed. This law is validated with rheometric data of linear viscoelasticity for well-characterized polydimethylsiloxane (PDMS) blends and their MWD obtained from size exclusion chromatography. The short time response of PDMS, which involves the glassy modes of relaxation, is modeled by considering Rouse diffusion between entanglement points of chains with M>Mceff. This mechanism is independent from the MWD. The unentangled chains with M<Mceff occluded in the polymer network also follow Rouse modes of relaxation although they exhibit dependence on the MWD.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.title
Linear Viscoelastic Relaxation Modulus of Polydisperse Poly(dimethylsiloxane) Melts Containing Unentangled Chains
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-11-24T13:49:19Z
dc.journal.volume
43
dc.journal.pagination
3035-3045
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Deiber, Julio Alcides. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
dc.description.fil
Fil: Peirotti, Marta Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
dc.description.fil
Fil: Villar, Marcelo Armando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahia Blanca. Planta Piloto de Ingeniería Química (I). Grupo Vinculado al Plapiqui - Investigación y Desarrollo en Tecnología Química; Argentina
dc.description.fil
Fil: Ressia, Jorge Aníbal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahia Blanca. Planta Piloto de Ingeniería Química (I). Grupo Vinculado al Plapiqui - Investigación y Desarrollo en Tecnología Química; Argentina
dc.description.fil
Fil: Valles, Enrique Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahia Blanca. Planta Piloto de Ingeniería Química (I). Grupo Vinculado al Plapiqui - Investigación y Desarrollo en Tecnología Química; Argentina
dc.journal.title
Polymer
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/S0032-3861(02)00095-2
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