NDLI: PEO−PPO−PEO Block Copolymer Micelles in Aqueous Electrolyte Solutions: Effect of Carbonate Anions and Temperature on the Micellar Structure and Interaction

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PEO−PPO−PEO Block Copolymer Micelles in Aqueous Electrolyte Solutions: Effect of Carbonate Anions and Temperature on the Micellar Structure and Interaction

Content Provider	Semantic Scholar
Author	Mao, Guomin Sukumaran, Sathish K. Beaucage, Gregory Saboungi, Marie-Louise Thiyagarajan, Pappannan
Copyright Year	2001
Abstract	The structure and interaction of micelles formed by an amphiphilic triblock copolymer P(EO)103−P(PO)39−P(EO)103 (F88) in aqueous electrolyte solutions of potassium carbonate have been investigated using small-angle neutron scattering as functions of temperature and salt concentration. Modeling the SANS data from the copolymer solutions using analytical expressions for the scattering intensity revealed the remarkable effects of carbonate anion concentration and the temperature on the self-assembly of F88 into spherical and cylindrical aggregates and subsequent phase separation. The critical micellization temperature (cmt) of 5 wt % F88 decreases with an increase in the salt concentration, and the cmt approaches ambient temperatures in a solution with 0.1 M K2CO3. An increase in salt concentration also decreases the temperature at which the transition from spherical to cylindrical micelles occurs as well as the phase separation temperature of the copolymer from the solution. These observations clearly indic...
Starting Page	552
Ending Page	558
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1021/ma001095s
Alternate Webpage(s)	http://www.eng.uc.edu/~beaucag/PDFPapers/maSukumaranPluronics.pdf
Alternate Webpage(s)	https://doi.org/10.1021/ma001095s
Volume Number	34
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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