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Rheological Properties of Multi-Block Associative Polyelectrolytes Obtained by Nitroxide-Mediated Solution Polymerization

Published online by Cambridge University Press:  10 February 2014

Alejandro Coronado ,
Areli I. Velazquez  and
Enrique J. Jiménez
Alejandro Coronado
Affiliation:
Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Venustiano Carranza Blvd and Ing. José Cárdenas Valdez St., 25280, Saltillo, Coahuila, México
Areli I. Velazquez
Affiliation:
Centro de Investigación en Química Aplicada (CIQA), 140 Enrique Reyna Blvd, 25294, Saltillo, Coahuila, México
Enrique J. Jiménez
Affiliation:
Centro de Investigación en Química Aplicada (CIQA), 140 Enrique Reyna Blvd, 25294, Saltillo, Coahuila, México
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Abstract

A multi-block associative polyelectrolyte based on poly(methacrylic acid-ra-styrene) [MAA-S] and poly(octadecyl methacrylate) [ODMA] was synthesized through stepwise nitroxide-mediated solution polymerizations. The obtained polymer has a heptablock copolymer structure, alternating MAA-S as hydrophilic blocks (theoretical degree of polymerization [DPT] of 250), and ODMA as hydrophobic blocks (DPT = 15). Rheological properties, in the linear-response regime, of aqueous solutions (polymer content = 1.5 wt.%) were studied as a function of the amount of blocks on the polymer using steady-shear and creep-compliance experiments. Rheological experiments demonstrate that the viscoelastic behavior of the polymer bearing an ODMA block in terminal position greatly differs from that of the polymer with MAA-S block terminations. The former behaves as a newtonian fluid on a wider range of shear rates than the latter, which exhibit a shear-thinning behavior, even at low shear rates, independently of the molecular weight and number of blocks.

Keywords

polymerpolymerizationmacromolecular structure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1613: Symposium 4D – New Trends in Polymer Chemistry and Characterization-2013 , 2014 , pp. 143 - 149
Copyright
Copyright © Materials Research Society 2014 

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