We know that starch is formed from granules separated from each other. When grafted with butyl acrylate (BA), those granules became more in contact and coherent to formed a merged network‐like spongy structure, which upholds a large amount of water to show improved water absorbency. BA was grafted onto starch to obtain a novel starch‐g‐poly(butyl acrylate) (PBA) biocopolymer hydrogel and formed a bionanocomposite hydrogel with mica as the additive for fire retardancy and was characterized by FTIR, SEM, and TGA. The insertion of mica into the starch‐g‐PBA exhibited an intercalated structure as confirmed by XRD and TEM analyses and also supported the hydrogel as a bionanocomposite, which showed an improved water absorbency and biodegradability with a better thermal stability. Cone calorimetric analysis evaluated the pronounced fire retardancy of the novel starch‐g‐PBA/mica bionanocomposite, providing an excellent protection in delaying the ignition time with greatest extension of time at a peak heat release rate on exposure to fire.
Potato starch was modified by free radical polymerization with 2-ethyl hexylacrylate (EHA) monomer in presence of sorbitol a surfactant and a comparative study was done taking both the additives i.e., sodium silicate (SS) and montmorillonite (MMT) individually to establish the greater extent of biodegradation as well as application of the nanocomposite in paint technology (exterior coating). This newly developed nanocomposite was found to be a cost effective material for domestic as well as industrial applications. The bonding and formation of the nanocomposites were characterised by FTIR, TGA, XRD and TEM. The application to paint technology was established by drawing thin films and studying the ageing property too. Property like coating, antifungal activity were also studied and the study on biodegradability of the developed nanocomposites (disposal after use) showed that the starch-g-PEHA/MMT was more degradable than starch-g-PEHA/SS exhibiting the durability of the coating for its better commercialization.
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