Effect of polysulfone brush functionalization on thermo-mechanical properties of melt extruded graphene/polysulfone nanocomposites Articles uri icon

published in

publication date

  • October 2019

start page

  • 84

end page

  • 93

volume

  • 151

International Standard Serial Number (ISSN)

  • 0008-6223

Electronic International Standard Serial Number (EISSN)

  • 1873-3891

abstract

  • The current work reports the preparation of nanocomposites of polysulfone (PSU) reinforced with reduced graphene oxide (rGO) by a solvent-free extrusion-injection method. In order to improve nanofiller dispersation, rGO was covalently grafted with PSU brushes via click chemistry. Several rGO/PSU nanocomposites with concentrations up to 3% (by weight) were prepared with both unmodified and PSU-grafted rGO. Morphology of the rGO/PSU nanocomposites were characterized via FE-SEM and TEM, which revealed a better dispersion state when rGO was grafted with PSU. Thermo-mechanical characterization of the rGO/PSU which improved the overall mechanical properties compared to unmodified rGO/PSU composites. An increase in the glass transition temperature (Tg) of the PSU matrix was also observed. Nanocomposites did not reach complete rheological percolation, therefore, the results have been explained in terms of the entanglement of grafted and matrix PSU chains leading to improved interphase effects. The presence of grafted polymer chains also increased the sliding capacity favoring the sample deformation with subsequent toughness improvement. The proposed solvent-free extrusion-injection method is easily scalable and enables the potential uses of rGO/PSU nanocomposites

keywords

  • graphene oxide; homopolymer brushes; melt extrusion; nanocomposites; polysulfone