Kinetics of Polybutadiene-poly(ethyleneoxide) Micelles in an Ionic Liquid

Santiago, Jessica
2009-04-08
Thumbnail Image

View/Download File

J_Santiago_URS2009_Poster.pdf (171.74 KB)

Persistent link to this item

https://hdl.handle.net/11299/50615
Statistics
View Statistics

Journal Title

Journal ISSN

Volume Title

Title

Kinetics of Polybutadiene-poly(ethyleneoxide) Micelles in an Ionic Liquid

Authors

Published Date

2009-04-08

Publisher

Type

Presentation

Abstract

Amphiphilic block copolymers can form micellar structures when dissolved in a selective solvent, which are of interest in a range of applications. Once in solution, a dynamic steady state is established; however, in some cases the incompatibility between block and solvent prevents the realization of equilibrium, forming kinetically frozen aggregates. The expectation is that sufficient thermal energy may allow the locked-in micelle system to relax into a more stable conformation. In this experiment, polybutadiene-poly(ethylene oxide) (PB-PEO) micelles were prepared in the ionic liquid 1-butyl-3-methyl imidazolium bis(trifluoromethylsulfonyl) imide [BMI][TFSI] via direct dissolution and cosolvent-aided dissolution using dichloromethane. Measurements of the hydrodynamic radii conducted by dynamic light scattering revealed the formation of micelles with drastically different average sizes in each preparation procedure. The thermally stable environment provided by [BMI][TFSI] then permitted the annealing of both samples at relatively high temperatures. The micelles formed by direct dissolution significantly decreased in size and width of distribution, in contrast to the cosolvent-produced micelles, which retained their smaller size and low polydispersity. Interestingly, the aggregates prepared by the two protocols yielded different micelle sizes even after thermal relaxation, suggesting the formation of a metastable morphology. These findings illustrate the strong path-dependence of micelle formation and relaxation.

Keywords

Description

Additional contributors: Tim Lodge, Luciana Meli (faculty mentors).

Related to

Replaces

License

Collections

UMTC Undergraduate Research Presentations and Papers (UROP)

Series/Report Number

Funding information

This research was supported by the Undergraduate Research Opportunities Program (UROP).

Isbn identifier

Doi identifier

Previously Published Citation

Suggested citation

Santiago, Jessica. (2009). Kinetics of Polybutadiene-poly(ethyleneoxide) Micelles in an Ionic Liquid. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/50615.

Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.