H. Yamamoto, Itsuro Tomatsu, and Akihito Hashidzume
Sep 23, 2000
Citations
0
Influential Citations
50
Citations
Journal
Macromolecules
Abstract
Associative properties of random copolymers of sodium 2-(acrylamido)-2-methylpropanesulfonate (AMPS) with N-hexylmethacrylamide (C6MAm) and with N-octadecylmethacrylamide (C18MAm) in aqueous solutions were investigated comparing with those of AMPS copolymers with N-dodecylmethacrylamide (C12MAm) reported previously. For characterization by fluorescence, all the polymers were labeled with 1 mol % of naphthalene by terpolymerization using N-(1-naphthylmethyl)methacrylamide. The polymers possessing C6 or C12 alkyl chains exhibit a strong tendency for intramolecular hydrophobic association to form unimolecular micelles when the CnMAm (n = 6, 12) contents in the polymers are in the ranges of 30−70 and 10−50 mol % for the C6 and C12 chains, respectively. A similar tendency was observed for the polymers possessing C18 chains when the C18MAm contents are in the range of 5−20 mol %, but polymer micelles formed were not completely unimolecular. Both the lower and upper limits of the CnMAm contents for all the three...