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Home  >  Journal list  >  Polymer Journal  >  Vol.46  No.3 (2014)  >  pp.189-194

Polymer Journal
<<Previous article Vol.46  No.3 (2014)   pp.189 - 194 Next article>>

Aggregation behavior of polystyrene-based amphiphilic diblock copolymers in organic media

Tomoe Arai1, Makoto Masaoka1, Tomohiro Michitaka1, Yosuke Watanabe1, Akihito Hashidzume1 and Takahiro Sato1
1 Department of Macromolecular Science, Graduate School of Science, Osaka University, Osaka, Japan

Two polystyrene (PS)-based amphiphilic diblock copolymers, PS(x)-PV(y) with x/y=3.3−7.7 and PS(x)-PA(y) with x/y=1.2−13.7 (where PS(x)-PV(y) and PS(x)-PA(y) possess poly[(ar-vinylbenzyl)trimethylammonium chloride] and poly(2-acrylamido-2-methylpropanesulfonic acid) blocks, respectively, and x and y are the degrees of polymerization), were prepared by reversible addition-fragmentation chain transfer radical polymerization to investigate the formation of reverse micelles by these copolymers in less polar organic media. The PS(x)-PV(y) samples were more dispersible in halogenated solvents, for example, chloroform and 1,2-dichloroethane (DCE), than the PS(x)-PA(y) samples because of the higher solvophobicity of the PA block. 1H NMR spectra for the PS(x)-PV(y) and PS(x)-PA(y) samples measured in CDCl3 exhibited no signals that corresponded to the PV or PA blocks in the diblock copolymers, which indicated that the PS(x)-PV(y) and PS(x)-PA(y) samples formed reverse micelles in halogenated solvents with the PV or PA blocks in the core. The structures of the reverse micelles formed from the PS(x)-PV(y) samples in DCE were investigated in detail by static and dynamic light scattering. The light scattering data indicated that PS(x)-PV(y) formed star-like micelles at x/y>6 and non-star-like micelles at x/y<6 in DCE. The morphology of the micelles formed from PS(x)-PV(y) with x/y<6 in DCE was most likely brush-like.


Keyword:
aggregation behavior; polystyrene-based amphiphilic diblock copolymers; reversible addition-fragmentation chain transfer (RAFT) radical polymerization; reverse micelle

Received: July 09, 2013 , Revised: July 29, 2013
Accepted: July 31, 2013 , Published online: September 25, 2013
© 2014 The Society of Polymer Science, Japan

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