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Polymers 2016, 8(2), 56; doi:10.3390/polym8020056

pH-Responsive Intra- and Inter-Molecularly Micelle Formation of Anionic Diblock Copolymer in Water

1
Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
2
Faculty of Engineering, Fukui University of Technology, 6-3-1 Gakuen, Fukui 910-8505, Japan
*
Authors to whom correspondence should be addressed.
Academic Editor: Christine Wandrey
Received: 25 January 2016 / Revised: 14 February 2016 / Accepted: 16 February 2016 / Published: 19 February 2016
(This article belongs to the Collection Polyelectrolytes)
View Full-Text   |   Download PDF [2173 KB, uploaded 22 February 2016]   |  

Abstract

Poly(sodium2-(acrylamido)-2-methylpropanesulfonate)-block-poly(sodium11-(acrylamido)undecanoate) (PAMPS–PAaU) was synthesized via reversible addition-fragmentation chain transfer (RAFT)-controlled radical polymerization. The “living” polymerization of PAaU was evidenced by the fact that the molecular weight distribution was narrow (Mw/Mn = 1.23). The pH-induced association behavior of PAMPS–PAaU in 0.1 M NaCl aqueous solutions as a function of solution pH was investigated by 1H NMR spin-spin relaxation time, dynamic light scattering (DLS), static light scattering (SLS), and fluorescence probe techniques. These results indicated that PAMPS–PAaU formed polymer micelles in 0.1 M NaCl aqueous solutions at pH < 9. At pH = 8–9, the polymer formed the micelles intramolecularly due to hydrophobic self-association of the PAaU block within the single polymer chain. On the other hand, at pH < 8, micellization occurred intermolecularly to form polymer micelles comprising hydrophobic PAaU cores and hydrophilic PAMPS shells. View Full-Text
Keywords: block copolymer; micelles; RAFT polymerization; water-soluble polymer; pH-responsive block copolymer; micelles; RAFT polymerization; water-soluble polymer; pH-responsive
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mizusaki, M.; Shimada, Y.; Morishima, Y.; Yusa, S.-I. pH-Responsive Intra- and Inter-Molecularly Micelle Formation of Anionic Diblock Copolymer in Water. Polymers 2016, 8, 56.

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