Structure and Entanglement Factors on Dynamics of Polymer-Grafted Nanoparticles

Liu, Siqi; Senses, Erkan; Jiao, Yang; Narayanan, Suresh; Akcora, Pinar

doi:10.1021/acsmacrolett.6b00089

Structure and Entanglement Factors on Dynamics of Polymer-Grafted Nanoparticles

Journal Article · Fri Apr 15 00:00:00 EDT 2016 · ACS Macro Letters

DOI:https://doi.org/10.1021/acsmacrolett.6b00089· OSTI ID:1339949

Liu, Siqi ^[1]; Senses, Erkan ^[1]; Jiao, Yang ^[1]; Narayanan, Suresh ^[2]; Akcora, Pinar ^[1]

Stevens Inst. of Technology, Hoboken, NJ (United States). Dept. of Chemical Engineering and Materials Science
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source

Nanoparticles functionalized with long polymer chains at low graft density are interesting systems to study structure–dynamic relationships in polymer nanocomposites since they are shown to aggregate into strings in both solution and melts and also into spheres and branched aggregates in the presence of free polymer chains. Our work investigates structure and entanglement effects in composites of polystyrene-grafted iron oxide nanoparticles by measuring particle relaxations using X-ray photon correlation spectroscopy. And for particles within highly ordered strings and aggregated systems, they experience a dynamically heterogeneous environment displaying hyperdiffusive relaxation commonly observed in jammed soft glassy systems. Furthermore, particle dynamics is diffusive for branched aggregated structures which could be caused by less penetration of long matrix chains into brushes. These results suggest that particle motion is dictated by the strong interactions of chains grafted at low density with the host matrix polymer.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

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

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1339949

Journal Information:: ACS Macro Letters, Journal Name: ACS Macro Letters Journal Issue: 5 Vol. 5; ISSN 2161-1653

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Ordering Polymer-Grafted Nanoparticles at Oil-Air Interfaces under Magnetic Fields Liu, Siqi; Wang, Haoyu; Akcora, Pinar Macromolecular Chemistry and Physics, Vol. 219, Issue 11 https://doi.org/10.1002/macp.201800012	journal	April 2018
Chain dynamics and nanoparticle motion in attractive polymer nanocomposites subjected to large deformations Senses, Erkan; Tyagi, Madhusudan; Natarajan, Bharath Soft Matter, Vol. 13, Issue 43 https://doi.org/10.1039/c7sm01009e	journal	January 2017
Translational and rotational dynamics of an ultra-thin nanorod probe particle in linear polymer melts Li, Shu-Jia; Qian, Hu-Jun; Lu, Zhong-Yuan Physical Chemistry Chemical Physics, Vol. 20, Issue 32 https://doi.org/10.1039/c8cp03653e	journal	January 2018
Chemical heterogeneity in interfacial layers of polymer nanocomposites Yang, Siyang; Liu, Siqi; Narayanan, Suresh Soft Matter, Vol. 14, Issue 23 https://doi.org/10.1039/c8sm00663f	journal	January 2018

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