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Chain dynamics of ultrahigh molecular weight polyethylene composites with graphene oxide nanosheets

journal contribution
posted on 13.09.2021, 10:58 by Nacho Martin-Fabiani-CarratoNacho Martin-Fabiani-Carrato, Stavros X Drakopoulos, Giuseppe Forte, Sylvain Prévost, Ingo Hoffmann, Sara Ronca
We investigate the melt chain dynamics of ultrahigh molecular weight polyethylene (UHMWPE) and its composites with graphene oxide (GO) nanosheets by means of neutron spin echo spectroscopy. For the GO concentrations explored, we observe hindered chain dynamics with respect to the pure UHMWPE. We propose a model where a fraction of the polymer is immobilized on top and at the bottom of GO sheets. This model enables us to provide a microscopic measurement of the adsorbed and free polymer fractions, as well as the thickness of the adsorbed layer. Our experiments provide experimental nanoscopic evidence of GO hindering entanglement formation in a polymer melt, a phenomenon that had been observed at the macroscale before via rheological measurements.

Funding

UK Research and Innovation Future Leaders Fellowship (MR/T02061X/1)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

ACS Macro Letters

Volume

10

Issue

4

Pages

460 - 465

Publisher

American Chemical Society (ACS)

Version

AM (Accepted Manuscript)

Rights holder

© American Chemical Society

Publisher statement

This paper was accepted for publication in the journal ACS Macro Letters and the definitive published version is available at https://doi.org/10.1021/acsmacrolett.1c00007

Acceptance date

24/03/2021

Publication date

2021-03-29

Copyright date

2021

ISSN

2161-1653

eISSN

2161-1653

Language

en

Depositor

Dr Nacho Martin-Fabiani Carrato. Deposit date: 7 September 2021