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https://hdl.handle.net/2440/68662
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Type: | Journal article |
Title: | Synthesis and self-assembly of [60]Fullerene containing sulfobetaine polymer in aqueous solution |
Author: | Ravi, P. Dai, S. Tam, K. |
Citation: | The Journal of Physical Chemistry B: Biophysical Chemistry, Biomaterials, Liquids, and Soft Matter, 2005; 109(48):22791-22798 |
Publisher: | Amer Chemical Soc |
Issue Date: | 2005 |
ISSN: | 1520-6106 1520-5207 |
Statement of Responsibility: | P. Ravi, S. Dai and K. C. Tam |
Abstract: | A well-defined poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA-b-C60) was synthesized using the atom transfer radical polymerization (ATRP) technique and betainized with 1,3-sulfobetaine to yield a Bet-PDMAEMA-b-C60. The solution properties were then studied by light transmittance, viscometric, 1H NMR laser light scattering, and transmission electron macroscopic techniques. It was found that Bet-PDMAEMA-b-C60 exhibits an upper critical solution temperature (USCT) similar to that observed for Bet-PDMAEMA in aqueous solution. However, the modification of Bet-PDMAEMA with a C60 molecule increases the UCST of Bet-PDMAEMA in solution, which is a function of the solution ionic strength. Addition of a small amount of salt increases the UCST, similar to polyelectrolyte systems, while the presence of an excess amount of salt leads to a decrease in the UCST, attributed to the antipolyelectrolyte effect of polyampholytes. In aqueous salt solution, Bet-PDMAEMA-b-C60 chains self-assemble into micelles that coexist with unimeric Bet-PDMAEMA-b-C60 chains. TEM studies revealed that the system agglomerates when the temperature exceeds the UCST. |
Rights: | Copyright © 2005 American Chemical Society |
DOI: | 10.1021/jp053088h |
Published version: | http://dx.doi.org/10.1021/jp053088h |
Appears in Collections: | Aurora harvest 5 Chemical Engineering publications |
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