2024-03-29T13:34:14Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2039772021-07-22T10:20:56Zcom_10261_115com_10261_3col_10261_368
Arbe, Arantxa
Rubio-Cervilla, Jon
Alegría, Ángel
Moreno Segurado, Ángel J.
Pomposo, José A.
Robles-Hernández, Beatriz
Malo de Molina, Paula
Fouquet, Peter
Juranyi, Fanni
Colmenero de León, Juan
2020-03-16T10:19:53Z
2020-03-16T10:19:53Z
2019-09-24
Macromolecules 52(18): 6935-6942 (2019)
http://hdl.handle.net/10261/203977
10.1021/acs.macromol.9b01264
http://dx.doi.org/10.13039/501100004219
http://dx.doi.org/10.13039/501100003086
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100011033
Through 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.
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Mesoscale dynamics in melts of single-chain Polymeric Nanoparticles
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