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Home  >  Journal list  >  Polymer Journal  >  Vol.31  No.11_2 (1999)  >  pp.1009-1014

Polymer Journal
<<Previous article Vol.31  No.11_2 (1999)   pp.1009 - 1014 Next article>>

Self-Association of Dodecyl Moieties Covalently Linked to a Polyelectrolyte in a Small Amount

Akihito Hashidzume1), Hiroshi Yamamoto1), Masanobu Mizusaki1) and Yotaro Morishima1)
1) Department of Macromolecular Science, Graduate School of Science, Osaka University

ABSTRACT:  Self-association behavior of random copolymers of sodium 2-(acrylamido)-2-methylpropane sulfonate (AMPS) and N-dodecylmethacrylamide (DodMAm) with low DOdMAm contents (fDod) of 2.5−10 mol% was investigated mainly by QELS. In the case of the copolymer with fDod=10 mol%, the relaxation time distribution is unimodal independent of the polymer concentration. On the other hand, in the case of the copolymers with fDod=2.5−7.5 mol%, the relaxation time distributions became bimodal at polymer concentrations >5 g/L, indicating interpolymer associations occurring at higher concentrations of the polymers. From QELS results, apparent values of hydrodynamic radii (Rh) for unimers and the interpolymer associates were estimated to be ca. 6−7 and ca. 120 nm, respectively. The interpolymer associates were found to be disrupted by the addition of a nonionic surfactant, n-dodecyl hexaethylene glycol monoether.


Keyword:
Random Copolymer/ Sodium 2-(Acrylamido)-2-methylpropanesulfonate/ N-Dodecylmethacrylamide/ Intrapolymer Association/ Interpolymer Association

Published online: March 28, 2005
© Copyright, 2005 by The Society of Polymer Science, Japan

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