Enhancing the dispersibility of multiwalled carbon nanotubes within starch-based films by the use of ionic surfactants
authors Alves, Z; Abreu, B; Ferreira, NM; Marques, EF; Nunes, C; Ferreira, P
nationality International
journal CARBOHYDRATE POLYMERS
author keywords Polysaccharides; Bionanocomposites; Hydrophobicity; Electrical conductivity; Mechanical properties
keywords NONCOVALENT FUNCTIONALIZATION; THERMOPLASTIC STARCH; PHYSICAL-PROPERTIES; PLASTICIZED STARCH; THERMAL-PROPERTIES; COMPOSITES; POTATO; WATER; NANOCOMPOSITES; BEHAVIOR
abstract The incorporation of carbon-based nanomaterials into biopolymer matrix, to provide mechanical reinforcement and to obtain electrically conductive bionanocomposites, requires the homogeneous dispersion of the fillers. Herein, it is investigated the influence of surfactant structures on the dispersibility of multiwalled carbon nanotubes (MWNT) within starch matrix. Three different ionic surfactants, sodium dodecyl sulphate (SDS), cetyltrimethylammonium bromide (CTAB) and sodium cholate (SC), are employed to disperse the MWNT. Films with MWNT-SC show better dispersibility and an increase of about 75% of tensile strength and 60% of Young's modulus compared with films using MWNT-SDS and MWNT-CTAB. Nevertheless, MWNT functionalized with CTAB impart the highest values of antioxidant activity (scavenging activity around 30% in 1.5 h) and electrical conductivity (sigma =14.75 S/m) to starch matrix. The properties of starch-based films can be tailored according to the physical adsorption of each surfactant on MWNT surface and/or the interfacial interaction of the surfactant with starch chains.
publisher ELSEVIER SCI LTD
issn 0144-8617
isbn 1879-1344
year published 2021
volume 273
digital object identifier (doi) 10.1016/j.carbpol.2021.118531
web of science category 11
subject category Chemistry, Applied; Chemistry, Organic; Polymer Science
unique article identifier WOS:000703333300008

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