硬脂酰氯改性碱木质素及微纳米球的制备

Modification of Alkali Lignin with Stearoyl Chloride and Preparation of Micro/Nano Spheres

关键词:  碱木质素  硬脂酰氯  自组装  微纳米球

Key Words:alkali lignin  stearoyl chloride  self-assembly  micro/nano spheres

摘要:以制浆造纸废液中的碱木质素为原料，采用绿色低毒的硬脂酰氯对其进行化学改性，制备酯化的碱木质素，并在四氢呋喃（THF）和水的混合溶液中通过自组装制备改性碱木质素微纳米球，探讨了硬脂酰氯的加入对改性碱木质素微纳米球的影响，并进一步研究了制备工艺对改性碱木质素微纳米球尺寸的影响，以实现对改性碱木质素微纳米球尺寸的控制。结果表明，经过硬脂酰氯改性后碱木质素微纳米球粒径达到纳米级，硬脂酰氯与碱木质素的最佳质量比为3.0∶1.0，胶束呈均一的球形，平均粒径为98.7 nm，在水溶液中分散稳定性达到最优；当改性碱木质素初始浓度从2.0 mg/mL降低到0.5 mg/mL时，改性碱木质素微纳米球平均粒径从557.6 nm减小到86.2 nm；搅拌速度从750 r/min增大到1500 r/min时，改性碱木质素微纳米球平均粒径从333.6 nm减小到94.1 nm；最终含水量从60%增大到90%时，改性碱木质素微纳米球平均粒径从312.0 nm减小到103.4 nm。

Abstract:Alkali lignin from pulping waste liquor was chemically modified with green and low toxic stearoyl chloride to prepare esterified alkali lignin. The modified alkali lignin micro/nano spheres were prepared by self-assembly in a mixed solvent of tetrahydrofuran （THF） and water. The influence of the addition of stearyl chloride on modified alkali lignin micro/nano spheres was discussed， and the influence of the preparation process on the size of modified alkali lignin micro/nano spheres was further studied to realize the control of the size of modified alkali lignin micro/nano spheres.The results showed that the particle size of alkali lignin micelles modified by stearoyl chloride reached nanoscale， and the micelles were uniform spheres with average particle size of 98.7 nm when the mass ratio of stearoyl chloride to alkali lignin was 3.0∶1.0， and the dispersion stability of the micelles in aqueous solution was optimal. The average particle size of modified alkali lignin micelles decreased from 557.6 nm to 86.2 nm when the initial concentration decreased from 2.0 mg/mL to 0.5 mg/mL. The average particle size decreased from 333.6 nm to 94.1 nm when the stirring speed increased from 750 r/min to 1500 r/min. The average particle size decreased from 312.0 nm to 103.4 nm when the final water content increased from 60% to 90%.