Browsing by Author "Faraone, Antonio"
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Item Intramolecular structure and dynamics in computationally designed peptide-based polymers displaying tunable chain stiffness(Physical Review Materials, 2021-09-07) Sinha, Nairiti J.; Shi, Yi; Kloxin, Christopher J.; Saven, Jeffery G.; Faraone, Antonio; Jensen, Grethe V.; Pochan, Darrin JPolymers assembled using computationally designed coiled coil bundlemers display tunable stiffness via control of interbundlemer covalent connectivity as confirmed using small-angle neutron scattering. Neutron spin echo spectroscopy reveals that rigid rod polymers show a decay rate Γ∼Q2 (Q is the scattering vector) expected of straight cylinders. Semirigid polymers assembled using bundlemers linked via 4-armed organic linker show flexible segmental dynamics at mid-Q and Γ∼Q2 behavior at high Q. The results give insight into linker flexibility-dependent interbundlemer dynamics in the hybrid polymers.Item Suppression of Segmental Chain Dynamics on a Particle’s Surface in Well-Dispersed Polymer Nanocomposites(ACS Macro Letters, 2024-06-18) Kim, Jihyuk; Thompson, Benjamin R.; Tominaga, Taiki; Osawa, Takahito; Egami, Takeshi; Förster, Stephan; Ohl, Michael; Senses, Erkan; Faraone, Antonio; Wagner, Norman J.The Rouse dynamics of polymer chains in model nanocomposite polyethylene oxide/silica nanoparticles (NPs) was investigated using quasielastic neutron scattering. The apparent Rouse rate of the polymer chains decreases as the particle loading increases. However, there is no evidence of an immobile segment population on the probed time scale of tens of ps. The slowing down of the dynamics is interpreted in terms of modified Rouse models for the chains in the NP interphase region. Thus, two chain populations, one bulk-like and the other characterized by a suppression of Rouse modes, are identified. The spatial extent of the interphase region is estimated to be about twice the adsorbed layer thickness, or ≈2 nm. These findings provide a detailed description of the suppression of the chain dynamics on the surface of NPs. These results are relevant insights on surface effects and confinement and provide a foundation for the understanding of the rheological properties of polymer nanocomposites with well-dispersed NPs.