Confined dynamics of grafted polymer chains in solutions of linear polymer

Poling-Skutvik, Ryan D.; Olafson, Katy N.; Narayanan, Suresh; Stingaciu, Laura; Faraone, Antonio; Conrad, Jacinta C.; Krishnamoorti, Ramanan

doi:10.1021/acs.macromol.7b01245

Confined dynamics of grafted polymer chains in solutions of linear polymer

Journal Article · Mon Sep 11 00:00:00 EDT 2017 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.7b01245· OSTI ID:1419950

^[1]; Olafson, Katy N. ^[1]; Narayanan, Suresh ^[2]; ^[3]; Faraone, Antonio ^[4]; Conrad, Jacinta C. ^[1]; Krishnamoorti, Ramanan ^[1]

Univ. of Houston, TX (United States). Dept. of Chemical and Biomolecular Engineering
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS) outstation Juelich Centre for Neutron Science (JCNS), Forschungszentrum Juelich GmbH
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research

Here, we measure the dynamics of high molecular weight polystyrene grafted to silica nanoparticles dispersed in semidilute solutions of linear polymer. Structurally, the linear free chains do not penetrate the grafted corona but increase the osmotic pressure of the solution, collapsing the grafted polymer and leading to eventual aggregation of the grafted particles at high matrix concentrations. Dynamically, the relaxations of the grafted polymer are controlled by the solvent viscosity according to the Zimm model on short time scales. On longer time scales, the grafted chains are confined by neighboring grafted chains, preventing full relaxation over the experimental time scale. Adding free linear polymer to the solution does not affect the initial Zimm relaxations of the grafted polymer but does increase the confinement of the grafted chains. Finally, our results elucidate the physics underlying the slow relaxations of grafted polymer.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Welch Foundation

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725

OSTI ID:: 1419950

Alternate ID(s):: OSTI ID: 1777821

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 18 Vol. 50; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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