Controlling the phase structures of polymer/surfactant complexes by changing macromolecular architecture and adding n-alcohols

Autor(es)

Percebom, Ana Maria ^{[1, 2]} ; Loh, Watson ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Inst Chem, Caixa Postal 6154, Campinas, SP - Brazil

^[2] Pontificia Univ Catolica Rio de Janeiro, Dept Chem, BR-22451900 Rio De Janeiro, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Colloid and Interface Science; v. 466, p. 377-387, MAR 15 2016.
• Citações Web of Science: 6

Resumo

Phase behavior of complex salts formed by a cationic surfactant and different ethoxylated polyions was investigated in water and with addition of two n-alcohols of different chain lengths: n-butanol and n-decanol. The polyion possesses a main chain of methacrylic acid randomly grafted with oligo(ethylene oxide) chains. Strong electrostatic interaction between the anionic main chain and the cationic surfactant hexadecyltrimethylammonium (C(16)TA) leads to the formation of C(16)TAP(MA-MAEO(n)) x:y complex salts. Modifications in polyion structure, such as changes in the proportion of grafted comonomers and in the side chain length caused differences in the overall balance of interactions with water and n-alcohols, altering the complex salt solubility and, consequently, the formed liquid-crystalline structures. The role of n-decanol as a cosurfactant was verified, but the hydrophilic side chains expanded the capacity of the formed liquid crystalline phases to incorporate water. Additionally, a novel structure, probably cubic bicontinuous (Pn3m), was observed coexisting with lamellar phases at low water concentration. Because n-butanol is known for being a good solvent for poly(ethylene oxide), these side chains intensified the role of this short chain n-alcohol as cosolvent for C(16)TAP(MA-MAEOn) x:y complex salts, favoring the formation of disordered solutions, including a bicontinuous microemulsion. (C) 2015 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 08/10980-4 - Autoassociação de sais complexos de surfatantes e copolímeros aleatórios e enxertados
• Beneficiário: Ana Maria Percebom Sette da Silva
• Linha de fomento: Bolsas no Brasil - Doutorado Direto