Interplay between local dynamics and mechanical reinforcement in glassy polymer nanocomposites

Adam P. Holt; Vera Bocharova; Shiwang Cheng; Alexander M. Kisliuk; Georg Ehlers; Eugene Mamontov; Vladimir N. Novikov; Alexei P. Sokolov

doi:10.1103/PhysRevMaterials.1.062601

Interplay between local dynamics and mechanical reinforcement in glassy polymer nanocomposites

Adam P. Holt, Vera Bocharova, Shiwang Cheng, Alexander M. Kisliuk, Georg Ehlers, Eugene Mamontov, Vladimir N. Novikov, Alexei P. Sokolov

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

The modification of polymer dynamics in the presence of strongly interacting nanoparticles has been shown to significantly change the macroscopic properties above the glass transition temperature of polymer nanocomposites (PNCs). However, much less attention has been paid to changes in the dynamics of glassy PNCs. Analysis of neutron and light scattering data presented herein reveals a surprising enhancement of local dynamics, e.g., fast picosecond and secondary relaxations, in glassy PNCs accompanied with a strengthening of mechanical modulus. We ascribe this counter-intuitive behavior to the complex interplay between chain packing and stretching within the interfacial layer formed at the polymer-nanoparticle interface.

Original language	English
Article number	062601
Journal	Physical Review Materials
Volume	1
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevMaterials.1.062601
State	Published - Nov 17 2017

Funding

We thank Halie Martin for measuring the mass density of our materials. This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Funders	Funder number
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering

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abstract = "The modification of polymer dynamics in the presence of strongly interacting nanoparticles has been shown to significantly change the macroscopic properties above the glass transition temperature of polymer nanocomposites (PNCs). However, much less attention has been paid to changes in the dynamics of glassy PNCs. Analysis of neutron and light scattering data presented herein reveals a surprising enhancement of local dynamics, e.g., fast picosecond and secondary relaxations, in glassy PNCs accompanied with a strengthening of mechanical modulus. We ascribe this counter-intuitive behavior to the complex interplay between chain packing and stretching within the interfacial layer formed at the polymer-nanoparticle interface.",

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AU - Cheng, Shiwang

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AU - Ehlers, Georg

AU - Mamontov, Eugene

AU - Novikov, Vladimir N.

AU - Sokolov, Alexei P.

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Interplay between local dynamics and mechanical reinforcement in glassy polymer nanocomposites

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