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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: Journal of Physical Chemistry B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical, 2005; 109(48):22791-22798
Publisher: Amer Chemical Soc
Issue Date: 2005
ISSN: 1520-6106
Statement of
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
RMID: 0020112537
DOI: 10.1021/jp053088h
Appears in Collections:Chemical Engineering publications

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