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Título

Mesoscale dynamics in melts of single-chain Polymeric Nanoparticles

AutorArbe, Arantxa CSIC ORCID; Rubio-Cervilla, Jon CSIC; Alegría, Ángel CSIC ORCID ; Moreno Segurado, Ángel J. CSIC ORCID ; Pomposo, José A. CSIC ORCID; Robles-Hernández, Beatriz CSIC ORCID; Malo de Molina, Paula CSIC ORCID; Fouquet, Peter; Juranyi, Fanni; Colmenero de León, Juan CSIC ORCID
Fecha de publicación24-sep-2019
EditorAmerican Chemical Society
CitaciónMacromolecules 52(18): 6935-6942 (2019)
ResumenThrough a combination of neutron scattering, dielectric spectroscopy, and rheological measurements we study the impact of purely intramolecular cross-linking on a melt fully made of polymeric single-chain nanoparticles (SCNPs) - a novel class of ultrasoft nano-objects. While the α-relaxation is unaffected with respect to the reference melt of linear chains, the emerging polymer/colloid duality of SCNPs leads to the almost complete smearing out of the rubbery plateau. This is the opposite effect to the creation of a permanent 3D network by intermolecular bonds. In addition, neutron scattering shows that a new relaxation mechanism slower than the α-relaxation appears at intermediate length scales. These are beyond the interchain distance but yet far from the hydrodynamic regime. This new slow relaxation - also detected by dielectric spectroscopy - contributes to the hierarchy of processes needed for the full relaxation of the SCNP melt and is tentatively related to the heterogeneities provoked by the internal multiloop topology of the SCNPs and the segregation of their internal domains.
Versión del editorhttp://dx.doi.org/10.1021/acs.macromol.9b01264
URIhttp://hdl.handle.net/10261/203977
DOI10.1021/acs.macromol.9b01264
Identificadoresdoi: 10.1021/acs.macromol.9b01264
e-issn: 1520-5835
issn: 0024-9297
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