Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session R52: Polymer Nanocomposites IV: Networks, Elastomers, and Gels
8:00 AM–11:00 AM,
Thursday, March 7, 2019
BCEC
Room: 253B
Sponsoring
Unit:
DPOLY
Chair: Jinhye Bae, University of California, San Diego
Abstract: R52.00007 : Interphases in polymer nanocomposites - recent insights from NMR studies
9:12 AM–9:48 AM
Presenter:
Kay Saalwaechter
(University of Halle-Wittenberg)
Authors:
Sol Mi Oh
(UNIST, Ulsan, South Korea)
Mozhdeh Abbasi
(University of Halle-Wittenberg)
So Youn Kim
(UNIST, Ulsan, South Korea)
Matthias Roos
(MIT, Cambridge, MA, USA)
Horst Schneider
(University of Halle-Wittenberg)
Kay Saalwaechter
(University of Halle-Wittenberg)
First, we present a more detailed investigation of a specific system, poly(ethylene oxide) – silica, which only superficially follows the above rationale [4]. While we do find rigid components forming a layer of up to 2 nm thickness around the particles, the layer thickness is not a function of temperature, and the chains in this layer feature rather fast, possibly uniaxial dynamics [5]. Moreover, small particles with diameters down to 10 nm exhibit much reduced layer thickness that depends on the end groups [5]. For a more complete picture, we have extended this study to a wider range of particle sizes, polymer molecular weight, and preparation conditions.
Second, spin-diffusion NMR experiments, which probe the size of nanometric domains with distinct mobility, indicate that the smooth-mobility-gradient picture of the “glassy layer” must be replaced by a scenario ruled by dynamic heterogeneities associated with the increased glass transition. We find intriguing similarities of filler-related species and interphase components in semicrystalline polymers and block copolymers [6].
[1] A. Mujtaba et al., ACS Macro Lett. 2014, 3, 481
[2] A. Papon et al., Macromolecules 2011, 44, 913
[3] A. Papon et al., Phys. Rev. Lett. 2012, 108, 065702
[4] S. Y. Kim et al., Macromolecules 2012, 45, 4225
[5] Y. Golitsyn et al., J. Chem. Phys. 2017, 146, 203303
[6] H. Schneider et al., Macromolecules 2017, 50, 8598
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