高等学校化学学报 ›› 2025, Vol. 46 ›› Issue (4): 20240528.doi: 10.7503/cjcu20240528

• 物理化学 • 上一篇    下一篇

油酰二乙醇胺在丙三醇/水混合溶剂中的自组装及流变性能

李嘉明, 王丹, 冯玉军, 殷鸿尧()   

  1. 四川大学高分子研究所, 高分子材料工程国家重点实验室, 成都 610065
  • 收稿日期:2024-12-02 出版日期:2025-04-10 发布日期:2025-01-16
  • 通讯作者: 殷鸿尧 E-mail:hyyin@scu.edu.cn
  • 基金资助:
    国家自然科学基金(22172108)

Self-assembly and Rheological Properties of NN-diethanololeamide in Glycerol/Water Cosolvent

LI Jiaming, WANG Dan, FENG Yujun, YIN Hongyao()   

  1. Polymer Research Institute,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China
  • Received:2024-12-02 Online:2025-04-10 Published:2025-01-16
  • Contact: YIN Hongyao E-mail:hyyin@scu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22172108)

摘要:

两亲分子自组装是创造新材料的重要方法, 此前的研究主要聚焦于室温及以上温度, 对零下低温环境中的自组装研究较少. 本文研究了非离子表面活性剂油酰二乙醇胺在丙三醇/水混合溶剂中的溶解性、 体系冰点、 组装行为及流变性能, 考察了溶剂组成、 油酰二乙醇胺含量及温度对组装行为和流变性能的影响. 研究发现, 油酰二乙醇胺可在丙三醇/水混合溶剂中组装形成层状胶束及层状液晶, 这些组装体的形成可显著提升体系的黏度和弹性性能. 混合溶剂中丙三醇含量越高, 越不利于层状液晶的形成. 油酰二乙醇胺含量越高, 越有利于层状液晶的形成. 当6.0%(质量分数)油酰二乙醇胺溶于丙三醇/水(体积比50∶50)混合溶剂中时, 体系的冰点可降低至‒33.4 ℃. 温度降低会促进组装、 增强体系黏度和弹性性能. 对于相同体系, 温度越低, 越容易形成层状液晶.

关键词: 两亲分子, 自组装, 零下低温, 溶致液晶

Abstract:

The self-assembly of amphiphilic molecules is a crucial approach for the development of novel materials. Previous studies have primarily focused on room and above room temperatures, while limited attention has been given to self-assembly at sub-zero temperatures. In this study, the solubility, freezing point, assembly behavior, and rheological properties of the non-ionic surfactant NN-diethanololeamide in glycerol/water mixed solvent were investigated. The effects of solvent composition, NN-diethanololeamide concentration, and temperature on assembly behavior and rheological properties were examined. It is observed that NN-diethanololeamide can form lamellar micelles and lamellar liquid crystals in the glycerol/water mixed solvent, thereby imparting favorable rheological properties to the system. A higher proportion of glycerol in the mixed solvent inhibits the formation of lamellar liquid crystals. Moreover, increasing the concentration of NN-diethanololeamide promotes the generation of lamellar liquid crystals. By dissolving 6.0%(mass ratio) NN-diethanololeamide in a glycerol/water(50/50, volume ratio) mixed solvent, it is possible to lower the freezing point of the system to ‒33.4 ℃. Interestingly, decreasing temperature enhances the self-assembly capability and improves rheological properties, and within this system as lower temperatures facilitate easier formation of lamellar liquid crystals.

Key words: Amphiphilic molecule, Self-assembly, Sub-zero temperature, Lyotropic liquid crystal

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