Influence of addition of silanized nanosilica and glycerol on hydrophobicity of starch using a factorial design

Abstract

ObstractThe thermoplastic starch (TPS) is regarded as a promising material for manufacturing packaging and products with biodegradable properties. This study aimed at obtaining hydrophobic starch using silanized silica nanoparticles (nSS) with hexamethyldisilazane. A factorial design 2 2 with central point was developed to evaluate the influence of glycerol (plasticizer) and nSS addition on the properties of water absorption, solubility and TPS contact angle. The materials morphology was also evaluated by means of scanning electron microscopy. The amount of glycerol and nSS influenced on starch hydrophobic character, for the increase of the glycerol dosage contributed to the increase of absorption and solubility of TPS in water. On the other hand, nSS has greater influence on the characteristics related to the TPS surface, favoring an increase of up to 27% in the contact angle values. Therefore, the sample with the greatest hydrophobic character was obtained by using lowest amounts of glycerol (30%) and highest amounts of nSS (5%).

Blend of cassava starch and high-density polyethylene with green tea for food packaging

“…Combining starch, plasticizer, and heat, an irreversible transition called gelatinization is achieved, providing starch with properties of a thermoplastic polymer and allowing the production of continuous starch films by thermopressing, for example. [8][9][10] In this study, gelatin was combined with starch to produce films with good mechanical properties. Gelatin is a protein from animal origin, water soluble, that can be used as reinforcement to the polymeric matrix.…”

“…Combining starch, plasticizer, and heat, an irreversible transition called gelatinization is achieved, providing starch with properties of a thermoplastic polymer and allowing the production of continuous starch films by thermopressing, for example. 8 -10…”