Structural [roperties of the multiwall carbon nanotubes/poly(methyl methacrylate) nanocomposites: effect of the multiwall carbon nanotubes covalent functionalization
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AuthorsBrković, Danijela V.
Pavlović, Vladimir B.
Pavlović, Vera P.
Uskoković, Petar S.
Marinković, Aleksandar D.
Article (Published version)
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The structural characteristics of polymer nanocomposites with functionalized multiwall carbon nanotubes (MWCNTs) in poly(methyl methacrylate) matrix have been studied in relation to nanofiller loading and surface functionality. Different functional groups have been covalently attached on the MWCNTs sidewalls in order to induce interfacial interactions at nanofiller/polymer interface, which resulted in an improved nanomechanical features. Structural properties of nanocomposites, studied with XRD and Raman analysis, indicated the most pronounced decrease in a degree of amorphousness for samples containing 0.5 and 1 wt% of MWCNTs functionalized with dapsone (dapson-MWCNT) and diethyl malonate (dem-MWCNT). SEM and TEM micrographs confirmed improved dispersibility of the MWCNTs modified with aromatic structure of dapsone inside PMMA matrix. A significant increase in a glass transition temperature of over 60°C has been found for the 1 wt% dapson-MWCNT nanocomposite. Additional modification o...f dapson-MWCNT by further increasing aromaticity and voluminosity of attached moiety (fid-MWCNT), showed 30°C increases in a glass transition temperature at 4 wt% of nanofiller loading, which is similar to shift of 37°C with loading of MWCNTs modified with ester terminal group. A maximum increase of 56% of reduced modulus and 86% of hardness was obtained for 1 wt% loading of dapson-MWCNT nanofiller.
Keywords:polymer nanocomposites / functionalized multiwall carbon nanotubes / poly(methyl methacrylate) matrix / XRD / Raman analysis
Source:Polymer Composites, 2017, 38, S1, E472-E489
- Hoboken, NJ : John Wiley & Sons
- Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (RS-45019)
- Directed synthesis, structure and properties of multifunctional materials (RS-172057)
- United States National Science Foundation (NSF), Grant HRD0833184
- United States National Aeronautics and Space Administration (NASA), Grant NNX09AV07A