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- 저자 : Tizazu H. Mekonnen (검색결과 1 건)
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Malin Ly,Tizazu H. Mekonnen 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
Cellulose nanocrystals (CNCs), a robust renewable and green nanomaterial, has potential as an excellentreinforcing and multifunctionalfiller for polymers used in coating and other applications. However, thehigh polarity of CNCs limits its interfacial interaction and dispersibility with several non-polar polymers. These limitations severely constrain it from transferring its functional attributes to polymeric materials. In this paper, three differentiated cationic surfactants: cetyltetramethylammoniumbromide (CTAB, C16single chain), dimethyldidodecylammonium bromide (DDAB, C12 double chains) and dimethyldihex-adecylammonium (DHAB, C16 double chains) were used to modify the surface of CNCs. The modificationswere confirmed using Fourier-Transform Infrared Spectroscopy (FTIR) and elemental analysis. X-raydiffraction (XRD) and thermogravimetric analysis (TGA) of the samples revealed that the crystallinitiesand the thermal stabilities of the modified CNCs were preserved. Corrosion protection studies of epoxynanocomposites containing the native and surfactant modified CNCs were conducted using model steelspecimens via salt spray and electrochemical test methods. The results reported herein indicated that theuse of surfactant modified CNCs resulted in an enhanced dispersibility in the epoxy matrices as comparedto native CNCs. The improved dispersion assisted in retardation of the penetration of electrolyte thatcaused a remarkable improvement in the metal corrosion protection performance, as compared tounfilled or native CNCfilled epoxy coatings.
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