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以异丙醇为溶剂使脱乙酰度90%的壳聚糖与2,3-环氧丙基磺酸反应,制备了亲水性增强、可溶于多种极性溶剂的N-(2-羟基3-磺酸基)丙基壳聚糖,其取代度随反应温度升高、反应时间延长而增大,在60℃反应8小时即可接近最大值85%。介绍了合成反应过程。用红外光谱确认了合成目的产物的化学结构。该改性壳聚糖1%水溶液的黏度(25℃)随取代度增大(13%~85%)而减小(268~158 mPa.s);在相同加量下(0.01%)该改性壳聚糖对浓度0.01 mol/L的4种起泡剂(阴离子、非离子型)溶液形成的泡沫的稳定能力(以泡沫半衰期表示),随取代度增大而下降。在相同加量下,取代度13%的该种改性壳聚糖的稳泡能力(以泡沫生成量和泡沫半衰期表示,非离子起泡剂AEO-9),较常用聚合物稳泡剂PVA、CMS-Na、PAM略好。
The isopropanol was used as the solvent to react 90% deacetylated chitosan with 2,3-epoxypropylsulfonic acid to prepare N- (2- Hydroxy 3-sulfonic acid) propyl chitosan, the degree of substitution with the reaction temperature increases, the reaction time increases and increases, at 80 ° C for 8 hours to close to a maximum of 85%. The synthesis reaction process is introduced. The chemical structure of the desired product was confirmed by infrared spectroscopy. The viscosity (25 ℃) of the modified chitosan 1% aqueous solution decreases (268 ~ 158 mPa · s) with increasing degree of substitution (13% -85%); The ability of chitosan to stabilize foams formed by four kinds of foaming agent (anionic, nonionic) solution with concentration of 0.01 mol / L, expressed as half-life of foam, decreased with increasing degree of substitution. In the same amount, the degree of substitution of 13% of the modified chitosan foam stability (in terms of foam formation and foam half-life, non-ionic foaming agent AEO-9), more commonly used polymer foam stabilizer PVA , CMS-Na, PAM slightly better.