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日用化学工业（中英文）

日用化学工业 ›› 2019, Vol. 49 ›› Issue (7): 419-425.doi: 10.3969/j.issn.1001-1803.2019.07.001

• 基础研究 •    下一篇

不同乙氧基链长香兰素基非离子表面活性剂的起泡性

李居龙1,2,丁凤美1,2,周翔1,2(),邢志奇1,赵涛1,2   

  1. 1. 东华大学 化学化工与生物工程学院,上海 201620
    2. 东华大学 生态纺织教育部重点实验室,上海 201620
  • 收稿日期:2018-12-19 修回日期:2019-06-08 出版日期:2019-07-25 发布日期:2019-07-26
  • 通讯作者: 周翔
  • 作者简介:李居龙（1991-）,男,江苏人,硕士研究生,电话：13262276096,E-mail： tyrese_li@foxmail.com。
  • 基金资助:
    国家高技术研究发展计划(863计划2013AA06A307)

Foamability of vanillin-based nonionic surfactants with different ethoxy chain length

LI Ju-long1,2,DING Feng-mei1,2,ZHOU Xiang1,2(),XING Zhi-qi1,ZHAO Tao1,2   

  1. 1. College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
    2. Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, Donghua University, Shanghai 201620, China
  • Received:2018-12-19 Revised:2019-06-08 Online:2019-07-25 Published:2019-07-26
  • Contact: Xiang ZHOU

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摘要：

对乙氧基链段（EO）数为8,10,12的香兰素基聚氧乙烯醚（VAEO）进行起泡实验,并以10 EO的壬基酚聚氧乙烯醚（NPEO10）为参照研究起泡性。结果表明,VAEO系列起泡性较差,且EO数越多起泡性越差;同一种表面活性剂,起泡能力随浓度的增加先增加后减小;通过分析VAEO和NPEO10前期（小于500 ms）动态表面张力与静态表面张力差值,发现VAEO的差值较小,导致恢复力小,起泡性较差。利用分子动力学模拟NPEO10和VAEO8在水中聚集和迁移情况,并结合100 ms内的动态表面张力,探究分子结构对起泡性的影响。结果表明,VAEO8在水中的聚集倾向较低,起泡时可以吸附于气/液界面的溶质更多,液膜的界面张力下降更快,对起泡不利。

关键词: 香兰素基聚氧乙烯醚, 起泡性, 动态表面张力, 分子动力学模拟

Abstract:

The vanillin-based polyoxyethylene ethers（VAEO）with ethoxylated（EO）segments of 8, 10 and 12 EO units were studied by the foaming test. Nonylphenol ethoxylate with 10 EO units（NPEO10）was also investigated for comparison. The results show that the foamability of VAEO series is poor, and the foamability even becomes worse with the increase of EO number. For the same surfactant, the foamability first increases and then decreases with the increase of concentration. By analyzing the dynamic surface tension data in the early stage（less than 500 ms）and the static surface tension data of VAEO and NPEO10, it was found that the difference between static and dynamic surface tension was small, indicating that the restoring force was small and the foamability of the VAEO series was poor. Molecular dynamics were used to simulate the aggregation and migration of NPEO10 and VAEO8 in water, by which the effects of molecular structure on foamability were explored in combination with the dynamic surface tension within 100 ms. The results show that, the lower tendency of VAEO8 for aggregation in water makes it adsorb to the gas-liquid interface more easily during foaming, resulting in a low dynamic surface tension value, which is not good for foamability.

Key words: vanillin-based polyoxyethylene ether, foamability, dynamic surface tension, molecular dynamics simulation

中图分类号: 

  • TQ423.2