Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: C1.00012 : Charged triblock copolymer self-assembly into charged micelles
Author:
Micelles were formed through the self-assembly of amphiphlic
block copolymer
poly(acrylic acid)-block-poly(methyl acrylate)-block-polystyrene
(PAA-PMA-PS). ~Importantly, the polymer is complexed with diamine
molecules
in pure THF solution prior to water titration solvent
processing-a critical
aspect in the control of final micelle geometry. The addition of
diamine
triggers acid-base complexation ~between the carboxylic acid PAA
side chains
and amines. ~Remarkably uniform spheres were found to form
close-packed
patterns when forced into dried films and thin, solvated films
when an
excess of amine was used in the polymer assembly process. Surface
properties
and structural features of these hexagonal-packed spherical
micelles with
charged corona have been explored by various characterization
methods
including Transmission Electron Microscopy (TEM), cryogenic TEM,
z-potential
analysis and Dynamic Light Scattering. The forming mechanism for
this
pattern and morphology changes against external stimulate such as
salt will
be discussed.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.C1.12
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