Chitosan nanocomposite films: Enhanced electrical conductivity, thermal stability, and mechanical properties

Study on the Effect of Silanization and Improvement in the Tensile Behavior of Graphene-Chitosan-Composite

“…The initial drop in weight before 150 °C is majorly attributed to the removal of moisture, carboxylic and hydroxyl groups from chitosan; from there onwards, the complete degradation starts, owing to 50% of the weight loss of the sample. On further heating to ~260 °C, the organic moieties of the saccharide rings get completely denatured [17,18]. The presence of strong exothermic peaks arising around 500-600 °C for all of the samples is attributed to the degradation of pyranose rings to form lower fatty acids.…”

“…The presence of strong exothermic peaks arising around 500-600 °C for all of the samples is attributed to the degradation of pyranose rings to form lower fatty acids. On further heating above 700 °C, the weight loss of almost 97% reflects the degeneration of the graphene structure [17,18]. The 3% ash residue for the functionalized sample is attributed to the presence of SiO2 formed due to the degradation of existing APTES molecule.…”

One-step synthesis of magnetic chitosan polymer composite films

“…According to the water adsorption capacity and the thermal properties of chitosan [20], such amino polysaccharide seems to be a good candidate for the development of magnetic composites based on iron oxide. In fact, electrostatic attraction mechanisms between chitosan macromolecular chains and A c c e p t e d M a n u s c r i p t 4 iron oxide may promote a good dispersion of nanoparticles [21][22]. In particular, the chemistry of chitosan is due to its polar groups (amino and hydroxyl moieties) involved in chelation processes [23] and to the interactions of these species with inorganic particles [21,24].…”

“…In fact, electrostatic attraction mechanisms between chitosan macromolecular chains and A c c e p t e d M a n u s c r i p t 4 iron oxide may promote a good dispersion of nanoparticles [21][22]. In particular, the chemistry of chitosan is due to its polar groups (amino and hydroxyl moieties) involved in chelation processes [23] and to the interactions of these species with inorganic particles [21,24]. Many works have been focused on the production of chitosan-stabilized magnetic nanoparticles [1,3,9,[25][26], which are protected by the polymer coating, but only few interesting studies have been realized on the synthesis of magnetic chitosan films, whose potential smart applications in many technological fields are significantly attractive [21,27].…”

“…In particular, the chemistry of chitosan is due to its polar groups (amino and hydroxyl moieties) involved in chelation processes [23] and to the interactions of these species with inorganic particles [21,24]. Many works have been focused on the production of chitosan-stabilized magnetic nanoparticles [1,3,9,[25][26], which are protected by the polymer coating, but only few interesting studies have been realized on the synthesis of magnetic chitosan films, whose potential smart applications in many technological fields are significantly attractive [21,27]. The most widely used method for the synthesis of magnetic chitosan composite (MCC) films consists in dispersing the previouslysynthesized iron oxide nanoparticles into a chitosan solution and subsequently filming the hybrid organic/inorganic mixture [28][29][30].…”