Abstract
The polar surface and hydrophilicity of starch nanoparticles (SNPs) result in their poor dispersibility in nonpolar solvent and poor compatibility with hydrophobic polymers, which limited the application in hydrophobic system. To improve their hydrophobicity, SNPs prepared through self-assembly of short chain amylose debranched from cooked taro starch, were modified by octenyl succinic anhydride (OSA). Size via dynamic light scattering of OSA-SNPs increased compared with SNPs. Fourier transform infrared spectroscopy data indicated the OSA-SNPs had a new absorption peak at 1727 cm-1, which was the characteristic peak of carbonyl, indicating the formation of the ester bond. The dispersibility of the modified SNPs in the mixture of water with nonpolar solvent increased with increasing of degree of substitution (DS). OSA-SNPs appear to be a potential agent to stabilize the oil-water systems.
Highlights
Much attention has been focused on polymeric composite materials filled with nanosized particles called nanocomposites [1]
octenyl succinic anhydride (OSA)-starch nanoparticles (SNPs) with different degree of substitution (DS) were prepared by varying the addition amount of OSA
The Dynamic light scattering (DLS) results showed that SNPs (Fig 1A) gave relatively small size distribution, ranging from 90 nm to 160 nm, with an average diameter of 132 nm
Summary
Much attention has been focused on polymeric composite materials filled with nanosized particles called nanocomposites [1]. Starch nanoparticles (SNPs) are considered one of the most promising polymers for fabrication of polymer nanocomposites and degradable materials, due to their wide availability, biodegradability, impressive mechanical properties, and low permeability [2]. There are abundant hydroxyl groups on the surface of SNPs that decrease the interface compatibility between hydrophilic SNPs fillers and hydrophobic rubber matrices [9]. To overcome this shortcoming, modifications of SNPs by introduction of hydrophobic groups have been reported with various reagents, such as benzyl [10], glacial acetic acid [11], fatty acids [12], and organic solvents [13]. Native starch modified by dicarboxylic acid anhydride, containing both hydrophilic and hydrophobic groups, is well known to produce amphiphilic starch and to improve
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