title: Synthesis and characterization of maleic anhydride esterified corn starch by the dry method.
abstract: Maleic anhydride esterified starch was synthesized by a dry method using corn starch as the material and maleic anhydride as the esterifying agent. The esterified starch (ES) was analyzed by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), which confirmed that there was a successful esterification reaction between the maleic anhydride and corn starch. The effects of reaction temperature and time on the degree of substitution of esterified starch were studied, where the results showed that 80 °C of reaction temperature and 3h of reaction time were optimal conditions. The result of XPS testing demonstrated that the esterification reaction led to increase of ester bonds in starch. The scanning electron microscopy (SEM) and laser particle size analyzer results showed that esterification led to roughness on the surface of the starch particle, and the particle size and distribution rate of esterification starch became larger. X-ray diffraction (XRD) analysis demonstrated that esterification reaction did not change the crystalline type of native starch. The differential scanning calorimeter (DSC) and thermo gravimetric analysis (TGA) confirmed that destruction of the crystal structure resulted in improved thermoplasticity of the starch, decreased the gelatinization temperature and increased the thermogravimetric rate of esterification starch.
authors.affiliation: Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), Northeast Forestry University, Harbin 150040, PR China.
authors.forename: Yingfeng
authors.initials: Y
authors.lastname: Zuo
authors.forename: Jiyou
authors.initials: J
authors.lastname: Gu
authors.forename: Long
authors.initials: L
authors.lastname: Yang
authors.forename: Zhibang
authors.initials: Z
authors.lastname: Qiao
authors.forename: Haiyan
authors.initials: H
authors.lastname: Tan
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D060326:Chemistry Techniques, Synthetic / Q000191:economics / Q000379:methods*; D003460:Crystallization; D004951:Esterification; D055772:Green Chemistry Technology; D007700:Kinetics; D008299:Maleic Anhydrides / Q000138:chemical synthesis* / Q000737:chemistry*; D010316:Particle Size; D013213:Starch / Q000737:chemistry*; D013696:Temperature; D003313:Zea mays / Q000737:chemistry*
chemical_list: D008299:Maleic Anhydrides; D013213:Starch
keywords: Characterization; Corn starch; Dry method synthesis; Maleic anhydride