Micellization and Clouding Behavior of EO–PO Block Copolymer in Aqueous Salt Solutions |
| |
Authors: | Keyur Patel Bhavesh Bharatiya Yogesh Kadam Pratap Bahadur |
| |
Affiliation: | (1) Department of Chemistry, Veer Narmad South Gujarat University, Surat, 395007, India |
| |
Abstract: | Aqueous solution properties of polyethylene oxide–block-polypropylene oxide–block-polyethylene oxide TBP (PEO)103(PPO)39(PEO)103] were studied in the presence of sodium salts with different anions (NaI, NaBr, NaCl, NaF, Na2SO4, Na3PO4) to investigate unimer-to-micelle transition critical micelle concentration (CMC), critical micellization temperature (CMT)],
micelle size and the phase separation (cloud point). This TBP, due to its very hydrophilic (80% PEO) nature does not form
micelles at ambient temperatures. Micellization can be induced much below its CMT in water on addition of sodium salts having
different anions. Analytical methods viz. fluorescence, FTIR and dynamic light scattering (DLS) were used to monitor the salt-induced
micellization. The hydration of respective anion and resultant contribution to its salting-out effect was found to be the
governing factor in promoting micellization. The presence of salt decreases the CMC, CMT and phase separation temperature.
The salts affect the aggregation process in agreement with an order mentioned in Hofmeister series. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|