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| Modification of Alkali Lignin with Stearoyl Chloride and Preparation of Micro/Nano Spheres |
| Received:April 20, 2021 |
| DOI：10.11980/j.issn.0254-508X.2021.09.001 |
| Key Words:alkali lignin stearoyl chloride self-assembly micro/nano spheres |
| Fund Project:浙江省重点研发计划，项目名称“可降解高阻菌医疗防护包装透析功能纸关键技术研发及产业化”（2021C01094）。 |
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| 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%. |
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