Preparation and characterisation of poly(ethylene glycol)-adsorbed graphene oxide nanosheets

Ehssan Al-Bermany, Biqiong Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Polymer–graphene nanocomposites are attracting growing attention of scientists and engineers as graphene-based nanofillers may enhance the properties of polymers significantly. This study aims to understand the adsorption behaviour of polymers on graphene oxide (GO) nanosheets. GO is synthesised using Hummerʼs method by oxidising graphite. Poly(ethylene glycol)s (PEGs) with different molecular weights are used as polymer models. A series of PEG/GO nanohybrids is prepared by applying different parameters in the solution processing method. Fourier transform infrared spectroscopy, X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, polarised optical microscopy, scanning electron microscopy and atomic force microscopy are used for characterising the hybrid nanomaterials. The characterisation results confirm the successful preparation of GO and the adsorption of the PEGs onto GO. The maximum amount of adsorbed PEG was 38 wt%. The adsorption amount of PEG increases by 46% after reducing the mixing time from 192 h to 72 h, 1700% due to an increase in the molecular weight from 1k to 100k, 13% for doubling the mixing ratio of PEG:GO from 1.5:1 to 3:1, 44% for applying no further washing procedure and 73% for applying all these parameters concurrently. The adsorption onto GO reduces the crystallinity of PEGs due to chain confinement. Different surface morphologies are observed in the hybrid nanomaterials showing various thicknesses of the PEG layer adsorbed on the GO nanosheets. This study may offer new insights into the manipulation of the interface in polymer–GO nanocomposites.

Original languageEnglish
JournalPolymer International
Early online date02 Nov 2020
DOIs
Publication statusEarly online date - 02 Nov 2020

Bibliographical note

Funding Information:
E. Al‐Bermany would like to thank the University of Babylon, the Iraqi Ministry of Higher Education and Scientific Researches, for funding his PhD scholarship.

Publisher Copyright:
© 2020 Society of Industrial Chemistry

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

  • graphene
  • interface
  • nanocomposite
  • poly(ethylene glycol)
  • surface adsorption

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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