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Enhancement of electrically conductive network structure in cementitious composites by polymer hybrid-coated multiwalled carbon nanotube
https://orcid.org/http://orcid.org/0000-0002-5169-4685
Multiwalled carbon nanotubes (MWCNTs) could be excellent additives for electrically conductive cementitious composite (ECCC). Dispersion of MWCNTs in cement matrix is the key for promoting the electric pathways. In this work, the surface of MWCNT was modified with polyindole (PIn) and polyvinyl acetate (PVAc) concurrent admicellar polymerization (AP). The concurrent polymerization was carried out to create a bifunctional coating of a conducting polymer using PIn and a hydrophilic polymer using PVAc. The coating improves compatibility of the MWCNTs with the incipient aqueous cement matrix while facilitating conductivity of the final composite. The AP-coated MWCNTs were investigated for colloidal stability in water and electrical conductivity. It was found that using monomers of In and VAc at 0.4:1 ratio provided appropriate properties of good water dispersion (801 NTU) and high electrical conductivity (6.85 × 102 S/cm). To fabricate ECCC, adding 0.3 wt.% AP-coated MWCNTs in cement yielded an electrical conductivity of 8.56 × 10–4 S/cm, more than 20 times higher than bare MWCNTs at the same concentration. AP-coated MWCNTs also enhanced compressive strength of the cement at 66.85 MPa. Field Emission Scanning Electron Microscope (FESEM) images of cement composites showed dispersion of MWCNTs and network structures in the cement matrix consistent with electrically conducting pathways. Results established that AP-coated MWCNTs created a network for electrical flow in the cement at lower concentrations for an improved ECCC.
Enhancement of electrically conductive network structure in cementitious composites by polymer hybrid-coated multiwalled carbon nanotube
https://orcid.org/http://orcid.org/0000-0002-5169-4685
Multiwalled carbon nanotubes (MWCNTs) could be excellent additives for electrically conductive cementitious composite (ECCC). Dispersion of MWCNTs in cement matrix is the key for promoting the electric pathways. In this work, the surface of MWCNT was modified with polyindole (PIn) and polyvinyl acetate (PVAc) concurrent admicellar polymerization (AP). The concurrent polymerization was carried out to create a bifunctional coating of a conducting polymer using PIn and a hydrophilic polymer using PVAc. The coating improves compatibility of the MWCNTs with the incipient aqueous cement matrix while facilitating conductivity of the final composite. The AP-coated MWCNTs were investigated for colloidal stability in water and electrical conductivity. It was found that using monomers of In and VAc at 0.4:1 ratio provided appropriate properties of good water dispersion (801 NTU) and high electrical conductivity (6.85 × 102 S/cm). To fabricate ECCC, adding 0.3 wt.% AP-coated MWCNTs in cement yielded an electrical conductivity of 8.56 × 10–4 S/cm, more than 20 times higher than bare MWCNTs at the same concentration. AP-coated MWCNTs also enhanced compressive strength of the cement at 66.85 MPa. Field Emission Scanning Electron Microscope (FESEM) images of cement composites showed dispersion of MWCNTs and network structures in the cement matrix consistent with electrically conducting pathways. Results established that AP-coated MWCNTs created a network for electrical flow in the cement at lower concentrations for an improved ECCC.
Enhancement of electrically conductive network structure in cementitious composites by polymer hybrid-coated multiwalled carbon nanotube
https://orcid.org/http://orcid.org/0000-0002-5169-4685
Multiwalled carbon nanotubes (MWCNTs) could be excellent additives for electrically conductive cementitious composite (ECCC). Dispersion of MWCNTs in cement matrix is the key for promoting the electric pathways. In this work, the surface of MWCNT was modified with polyindole (PIn) and polyvinyl acetate (PVAc) concurrent admicellar polymerization (AP). The concurrent polymerization was carried out to create a bifunctional coating of a conducting polymer using PIn and a hydrophilic polymer using PVAc. The coating improves compatibility of the MWCNTs with the incipient aqueous cement matrix while facilitating conductivity of the final composite. The AP-coated MWCNTs were investigated for colloidal stability in water and electrical conductivity. It was found that using monomers of In and VAc at 0.4:1 ratio provided appropriate properties of good water dispersion (801 NTU) and high electrical conductivity (6.85 × 102 S/cm). To fabricate ECCC, adding 0.3 wt.% AP-coated MWCNTs in cement yielded an electrical conductivity of 8.56 × 10–4 S/cm, more than 20 times higher than bare MWCNTs at the same concentration. AP-coated MWCNTs also enhanced compressive strength of the cement at 66.85 MPa. Field Emission Scanning Electron Microscope (FESEM) images of cement composites showed dispersion of MWCNTs and network structures in the cement matrix consistent with electrically conducting pathways. Results established that AP-coated MWCNTs created a network for electrical flow in the cement at lower concentrations for an improved ECCC.
Enhancement of electrically conductive network structure in cementitious composites by polymer hybrid-coated multiwalled carbon nanotube
Mater Struct
Onthong, Suthisa (Autor:in) / O’Rear, Edgar A. (Autor:in) / Pongprayoon, Thirawudh (Autor:in)
01.11.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Electrically conductive cement composites , Modified carbon nanotube , Admicellar polymerization , Polymer hybrid coating , Cement properties Engineering , Solid Mechanics , Materials Science, general , Theoretical and Applied Mechanics , Manufacturing, Machines, Tools, Processes , Civil Engineering , Building Materials
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