助溶剂对非离子型聚环氧乙烷-聚环氧丙烷-聚环氧乙烷嵌段共聚物在质子离子液体硝酸乙铵中自组装的影响

Effect of cosolvents on the self-assembly of a non-ionic polyethylene oxide-polypropylene oxide-polyethylene oxide block copolymer in the protic ionic liquid ethylammonium nitrate.

作者信息

Chen Zhengfei, Greaves Tamar L, Caruso Rachel A, Drummond Calum J

机构信息

PFPC, School of Chemistry, The University of Melbourne, Melbourne, VIC 3010, Australia; CSIRO Materials Science and Engineering, Bag 10, Clayton South MDC, VIC 3169, Australia.

CSIRO Materials Science and Engineering, Bag 10, Clayton South MDC, VIC 3169, Australia; School of Applied Sciences, College of Science, Engineering and Health, RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia.

出版信息

J Colloid Interface Sci. 2015 Mar 1;441:46-51. doi: 10.1016/j.jcis.2014.11.005. Epub 2014 Nov 14.

DOI:10.1016/j.jcis.2014.11.005

PMID:25490561

Abstract

The effect of water and methanol on the self-assembled structures formed by the polyethylene oxide-polypropylene oxide-polyethylene oxide block copolymer Pluronic P123 in ethylammonium nitrate was investigated by small angle X-ray scattering (SAXS). Two ternary phase diagrams were established. The addition of water had only a minor effect on the liquid crystal structures, however methanol had a significant effect, which was attributed to methanol being a good solvent for both the PEO and PPO blocks of the polymer. No lyotropic liquid crystal phases were retained when methanol reached 25 wt%. The phase behaviour did not change significantly over the temperature range from 25 to 45°C.

摘要

通过小角X射线散射（SAXS）研究了水和甲醇对聚环氧乙烷-聚环氧丙烷-聚环氧乙烷嵌段共聚物普朗尼克P123在硝酸乙铵中形成的自组装结构的影响。建立了两个三元相图。水的加入对液晶结构影响较小，然而甲醇有显著影响，这归因于甲醇是聚合物的PEO和PPO嵌段的良溶剂。当甲醇达到25 wt%时，没有溶致液晶相保留。在25至45°C的温度范围内，相行为没有显著变化。