Abstract: Dialdehyde starch was synthesized by the one-step of acid hydrolysis and oxidation, taking corn starch as raw material, hydrochloric acid as acid agent and sodium periodate as oxidant. Fourier transform infrared spectroscopy characterization confirmed the successful synthesis of the dialdehyde starch. The effect of reaction temperature, reaction time, concentration of hydrochloric acid and starch emulsion concentration on aldehyde group content of dialdehyde starch was studied. And then the X-ray diffraction and thermogravimetric were used for characterization. The results showed that the aldehyde group content increased with the increase of reaction temperature and reaction time. When the temperature reached 50 ℃ and the time up to 4 h, the acid hydrolysis oxidation tended to be stable. High concentration of hydrochloric acid and starch would lead to the decline of aldehyde content, and the suitable concentration is 0.6 mol/L and 8% of hydrochloric acid and starch, respectively. X-ray diffraction analysis showed that with the increase of hydrochloric acid concentration, the crystallinity of the dialdehyde starch increased. Thermal gravimetric analysis showed a larger residual amount of thermal decomposition of the dialdehyde starch which possess a relatively higher crystallinity, and the initial temperature of thermal decomposition decreased with the increase of hydrochloric acid concentration.
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2017, Vol. 31 
