Phase diagrams come alive: understanding how to create, destroy or change ordered surfactant structures by polymerizing the counterions

Research output: Contribution to journalArticle

Standard

Phase diagrams come alive: understanding how to create, destroy or change ordered surfactant structures by polymerizing the counterions. / Santos, Salome; Piculell, Lennart; Karlsson, Ola; Miguel, Maria da Graca.

In: Soft Matter, Vol. 7, No. 5, 2011, p. 1830-1839.

Research output: Contribution to journalArticle

Harvard

APA

CBE

MLA

Vancouver

Author

RIS

TY - JOUR

T1 - Phase diagrams come alive: understanding how to create, destroy or change ordered surfactant structures by polymerizing the counterions

AU - Santos, Salome

AU - Piculell, Lennart

AU - Karlsson, Ola

AU - Miguel, Maria da Graca

PY - 2011

Y1 - 2011

N2 - Free radical polymerization of acrylate counterions to cationic alkyltrimethylammonium surfactant ions was performed in aqueous media. The results of the reactions were either formation, destruction or change of liquid crystalline surfactant structures, depending on the starting conditions such as the surfactant concentration, the content of inert counterions and the monomer-to-initiator ratio. The results were consistent with predictions inferred from equilibrium phase diagrams recently established for aqueous mixtures of the cationic surfactants alkyltrimethylammonium acetate or bromide (C(n)TAAc/Br; n = 12, 16) with the "complex salts'' C(n)TAPA(m), in which the counterions to the surfactant ions were polyacrylate polyions (PAs) of different degrees of polymerization (m = 25, 30 or 6000). Appropriate pathways, at constant water content, through the latter ternary phase diagrams show what happens, at equilibrium, when monomeric counterions to the surfactant ions are replaced by polymeric counterions. These pathways through the equilibrium phase diagrams thus "come alive'' in the counterion polymerization processes performed here.

AB - Free radical polymerization of acrylate counterions to cationic alkyltrimethylammonium surfactant ions was performed in aqueous media. The results of the reactions were either formation, destruction or change of liquid crystalline surfactant structures, depending on the starting conditions such as the surfactant concentration, the content of inert counterions and the monomer-to-initiator ratio. The results were consistent with predictions inferred from equilibrium phase diagrams recently established for aqueous mixtures of the cationic surfactants alkyltrimethylammonium acetate or bromide (C(n)TAAc/Br; n = 12, 16) with the "complex salts'' C(n)TAPA(m), in which the counterions to the surfactant ions were polyacrylate polyions (PAs) of different degrees of polymerization (m = 25, 30 or 6000). Appropriate pathways, at constant water content, through the latter ternary phase diagrams show what happens, at equilibrium, when monomeric counterions to the surfactant ions are replaced by polymeric counterions. These pathways through the equilibrium phase diagrams thus "come alive'' in the counterion polymerization processes performed here.

U2 - 10.1039/c0sm00958j

DO - 10.1039/c0sm00958j

M3 - Article

VL - 7

SP - 1830

EP - 1839

JO - Soft Matter

JF - Soft Matter

SN - 1744-6848

IS - 5

ER -