Effect of surface esterification with octenyl succinic anhydride on hydrophilicity of corn starch films

Abstract

Surface of corn starch films was modified through esterification using octenyl succinic anhydride as reactant. Physical properties of the films, moisture absorption, and water contact angle were measured to characterize the effect of the surface esterification modification. The influences of the concentration of alkaline aqueous solution for activating starch, reaction temperature, and time were investigated. It was found that the pretreatments with 1.0% or 2.0% NaOH aqueous solution and reacting at 35 C for 6 h gave rise to films possessing higher water contact angle, lower equilibrium moisture content, and moisture absorption rate at 95% relative humidity (RH). After the surface esterification modification, the equilibrium moisture content of the starch film decreased up to 29% at 95% RH and the surface water contact angle of the film increased up to 83%.

Effect of Octenylsuccinylation of Oxidized Cassava Starch on Grease Resistance and Waterproofing of Food Wrapping Paper

“…The standard Tappi T559 pm-96 method was employed to evaluate grease resistance. Papers were tested using a selection of solutions with different Kit numbers (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12), which contained three reagents (castor oil, n-heptane and toluene) in specific proportions. Kit number 1 with the highest surface energy, and Kit number 12 with the lowest surface energy, were the least and most aggressive oils, respectively.…”

“…Therefore, during surface sizing of high grade paper and oxidized starch has gradually been replaced with cationic starch and other starches with a high retention rate . To improve the water resistance of biopolymer films, several strategies have been investigated, including (1) blending with lipids such as stearic acid, palmitic acid, oleic acid, and beeswax; (2) blending with polymers such as carboxymethyl and nanocrystalline cellulose; and (3) hydrophobization of biopolymers such as esterification with octenylsuccinic anhydride (OSA) . Moisture‐proofing of stretchable sweet potato starch film can be enhanced by incorporating octenylsuccinated starch .…”

“…[4] To improve the water resistance of biopolymer films, several strategies have been investigated, including (1) blending with lipids such as stearic acid, palmitic acid, oleic acid, and beeswax [5,6] ; (2) blending with polymers such as carboxymethyl [7] and nanocrystalline cellulose [8] ; and (3) hydrophobization of biopolymers such as esterification with octenylsuccinic anhydride (OSA). [9] Moisture-proofing of stretchable sweet potato starch film can be enhanced by incorporating octenylsuccinated starch. [10] Surface sizing with starch sodium octenylsuccinate revealed that a coating amount of 0.8613 g m À2 and a degree of substitution (DS) value of 0.0381 achieved maximal surface strength of the paper.…”

Recent progress in chemical modification of starch and its applications

“…95 Singh et al 94 synthesized acetylated corn and potato starches in NaOH solution, which showed higher solubility, swelling power and light transmittance than the native starch. Zhou et al 20 investigated the inuence of surface esterication on moisture absorption behavior and optimal conditions for esterication. Winkler et al 95 compared lauric acid vinyl esterication (Scheme 2a) and lauroyl chloride esterication (Scheme 2b).…”

Tough thermoplastic starch modified with polyurethane microparticles by reactive extrusion

“…Another aspect requiring attention is its tendency to crystallize during storage which makes it brittle. Consequently, various chemical modifications of TPS have been created to address these problems [5][6][7].…”