烷基化壳聚糖硫酸盐的制备及性能研究

Preparation and properties of alkylated chitosan sulfate

通过希夫碱反应并还原、硫酸化和中和反应,合成了两种壳聚糖表面活性剂:十二烷基壳聚糖硫酸盐(D12CTS)和十烷基壳聚糖硫酸盐(D10CTS)。通过红外光谱(FT-IR)、核磁共振氢谱(1H NMR)、元素分析(EA)和热重分析(TGA)鉴定了它们的结构。结果表明,D10CTS和D12CTS的烷基化度分别为0.77和0.52,硫酸化度分别为1.35和1.79。通过表面张力和接触角测量表明D10CTS和D12CTS具有良好的表面活性和铺展性,临界胶束浓度(cmc)分别为0.69和0.49 g/L,最低表面张力(γcmc)分别为39.50和35.75 mN/m。目标产物具有一定的起泡性能和乳化能力,该表面活性剂为低泡型表面活性剂,有望在化妆品领域发挥潜在的应用。

Two kinds of chitosan surfactants,dodecyl chitosan sulfate(D10CTS)and decyl chitosan sulfate(D12CTS)were synthesized by Schiff base reaction,reduction,sulfation and neutralization reaction.Their structures were identified by infrared spectroscopy(FT-IR),H NMR spectroscopy(1H NMR),elemental analysis(EA),and thermogravimetric analysis(TGA).The results show that the degrees of alkylation are 0.77 and 0.52,and the degrees of sulfation are 1.35 and 1.79,respectively.Favourable surface activity and spreadability of D10CTS and D12CTS were evidenced by surface tension and contact angle measurements.The critical micelle concentrations(cmc)are 0.69 and 0.49 g/L,and the minimum surface tensionγcmc are 39.50 and 35.75 mN/m,respectively.The target products possess certain foaming properties and emulsification performance.The surfactants are low-foaming and are expected to play a potential application in the field of cosmetics.