Surface functionalization of thermally reduced graphene with 3-aminopropyltriethoxy silane and its composite with crosslinked polyethylene
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
This research work encompasses the potential application of graphene as filler in high voltage transmission power cables. The graphene was produced through thermal exfoliation method from graphite oxide (GO) in the laboratory. In order to improve dispersion ability, thermally reduced graphene (TRG) was surface modified covalently with 3-aminopropyltriethoxy silane (APTS) at 80°C for 30 minutes in presence of acetone. The silane attachment at the thermally reduced graphene surface was confirmed by the following techniques: FTIR, XPS, SEM and EDS. The APTS functionalized TRG sheets showed better dispersion in organic solvents like DMF (N, N-dimethylformamide) and APTS (3-aminopropyltriethoxy silane) than polar solvents water and ethanol. Furthermore, crosslinked polyethylene was melt processed with thermally reduced graphene in a mini extruder at 135-140°C with rotor speed of 100 rpm. The resulting composites were thermally analysed by DSC and mechanically tested by tensile machine. An increase in crystallinity and tensile modulus was observed for TRG/crosslinked polyethylene nanocomposites. Hence, thermally reduced graphene was successfully surface modified by APTS molecule but quantitatively this modification was lower than expected.
Place, publisher, year, edition, pages
2011. , 54 p.
graphene, nanocomposite, polyethylene, surface functionalization, power cables
IdentifiersURN: urn:nbn:se:kth:diva-150822OAI: oai:DiVA.org:kth-150822DiVA: diva2:745535