Nonmonotonic Composition Dependence of Viscosity upon Adding Single-Chain Nanoparticles to Entangled Polymers.

Autor:	Pyromali C; FORTH, Institute of Electronic Structure & Laser, Heraklion 71110, Crete, Greece.; Department of Materials Science and Technology, University of Crete, Heraklion 71110, Crete, Greece., Patelis N; Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15771 Athens, Greece., Cutrano M; FORTH, Institute of Electronic Structure & Laser, Heraklion 71110, Crete, Greece.; Dipartimento di Ingegneria Chimica e Materiali, Università Degli Studi di Cagliari, Piazza D'Armi, I-09123 Cagliari, Italy., Gosika M; Centro de Fisica de Materiales (CSIC-UPV/EHU) and Materials Physics Center MPC, Paseo Manuel de Lardizabal 5, E-20018 San Sebastian, Spain.; Department of Physics, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014 Tamil Nadu, India., Glynos E; FORTH, Institute of Electronic Structure & Laser, Heraklion 71110, Crete, Greece.; Department of Materials Science and Technology, University of Crete, Heraklion 71110, Crete, Greece., Moreno AJ; Centro de Fisica de Materiales (CSIC-UPV/EHU) and Materials Physics Center MPC, Paseo Manuel de Lardizabal 5, E-20018 San Sebastian, Spain.; Donostia International Physics Center, Paseo Manuel de Lardizabal 4, E-20018 San Sebastian, Spain., Sakellariou G; Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15771 Athens, Greece., Smrek J; Faculty of Physics, University of Vienna, 1090 Vienna, Austria., Vlassopoulos D; FORTH, Institute of Electronic Structure & Laser, Heraklion 71110, Crete, Greece.; Department of Materials Science and Technology, University of Crete, Heraklion 71110, Crete, Greece.
Jazyk:	angličtina
Zdroj:	Macromolecules [Macromolecules] 2024 May 14; Vol. 57 (10), pp. 4826-4832. Date of Electronic Publication: 2024 May 14 (Print Publication: 2024).
DOI:	10.1021/acs.macromol.4c00206
Abstrakt:	Well-characterized single-chain nanoparticles (SCNPs), synthesized from a linear polystyrene precursor through an intramolecular [4 + 4] thermal cycloaddition cross-linking reaction in dilute conditions, were added to entangled polystyrene melts at different concentrations. Starting from the pure linear melt, which is much more viscous than the melt of SCNPs, the zero-shear viscosity increased upon the addition of nanoparticles and reached a maximum before eventually dropping to the value of the SCNP melt. Molecular simulations reveal the origin of this unexpected behavior, which is the interplay of the very different compositional dependences of the dynamics of the two components. The SCNPs become much slower than the linear chains as their concentration decreases because they are threaded by the linear chains, reaching a maximum viscosity which is higher than that of the linear chains at a fraction of about 20%. This behavior is akin to that of single-loop ring polymers when added to linear matrices. This finding provides insights into the design and use of SCNPs as effective entropic viscosity modifiers of polymers and contributes to the discussion of the physics of loopy structures. Competing Interests: The authors declare no competing financial interest. (© 2024 American Chemical Society.)
Databáze:	MEDLINE
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