2-羟基-3-丁氧基丙基淀粉的制备及性能研究

Preparation and performance of 2-Hydroxy-3-Butoxy propyl Starch

摘要:

摘 要：以玉米淀粉为原料，丁基缩水甘油醚为疏水化试剂，氢氧化钠作为催化剂，水作为溶剂，在较温和反应条件下合成了2-羟基-3-丁氧基丙基淀粉(HBPS)。通过考察反应温度、反应时间、碱用量、水用量等因素对取代度和反应效率的影响，确定的最佳的制备条件为：当n(BGE):n(AGU)=0.615时，水用量m(H2O):m(AGU)=2:1、碱用量n(NaOH):n(AGU)=0.5:1、反应温度75℃和反应时间为5h,产品取代度MS=0.45，反应效率为RE=73%。使用IR、1H-NMR、13C-NMR对产物结构进行了表征，证明结构的正确。热重实验表明，疏水基团的引入可提高淀粉的耐热性能。

Abstract:

Abstract: 2-Hydroxy-3-butoxypropyl starches (HBPS) were synthesized by environmentally friendly process using butyl glycidyl ether(BGE) as hydrophobic reagent, water as solvent and sodium hydroxide as a catalyst. The reaction conditions were investigated and optimized. Optimum conditions were obtained as follows: n(BGE):n(AGU)=0.615, amount of solvent was m(H2O):m(AGU)=2:1, amount of catalytical NaOH was n(NaOH):n(AGU)=0.5:1, reaction time was 5h, reaction temperature was 75 ℃, molar substitution (MS) of 2-hydroxy-3-butoxypropyl was up to 0.45, the reaction efficiency(RE) was 73%. The HBPS and corn starch were characterized by IR, 1H-NMR and 13C-NMR. In addition, the TG result indicates that hydrophobic modification can improve the thermal stability of stach .