Abstract
In this work, an easy, green, noncovalent surface modification of pristine graphene (GR) was carried out using a single-step method between sodium carboxymethyl cellulose (CMC) and pristine GR, resulting in the formation of a modified CMC–GR (CGR) dispersion with 15% nanosheet content, the first reported in water. Results obtained from thermogravimetry analysis (TGA), Raman spectroscopy, and atomic force microscopy (AFM) confirm that the CMC modifier is successfully decorated on the pristine GR surface. Analyses of transmittance spectrum, zeta potential and transmittance electron microscopy (TEM) images reveal that the modified CGR has a high degree of dispersion. More importantly, the pristine GR is insoluble, while the modified CGR-3, mixed with 1.1 wt% CMC modifier, is easily well dispersed in water and has good flowability, and no sedimentation is observed after more than 3 months.
Highlights
Waterborne coatings have gained much attention for metal protection on account of their reduced emission of volatile organic compounds (VOCs), avoiding serious workplace accidents.[1]
We report an easy, green modi cation of graphene by using a noncovalent strategy between carboxymethyl cellulose (CMC) and graphene, as shown in Scheme 1, to prepare a modi ed graphene CGR dispersion with 15% nanosheet content, good dispersibility, and long storage stability, the rst reported in water
Supporting evidence for the noncovalent attachment of CMC modi er on the pristine GR surfaces comes from the thermogravimetry analysis (TGA)
Summary
Waterborne coatings have gained much attention for metal protection on account of their reduced emission of volatile organic compounds (VOCs), avoiding serious workplace accidents.[1]. We report an easy, green modi cation of graphene by using a noncovalent strategy between CMC and graphene, as shown in Scheme 1, to prepare a modi ed graphene CGR dispersion with 15% nanosheet content, good dispersibility, and long storage stability, the rst reported in water. This method for green surface modi cation of pristine GR can be used to prepare GR/waterborne polymer nanocomposites. CMC and the polymer matrix substantially enhance the interactions between them and improve their compatibility This strategy is available and economical due to its easy operation in industry. We believe that this work will accelerate the development of industrial anticorrosion coatings for ultralight metals
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