Artículo de revista
Immobilization of rhodamine 6G in calcium alginate microcapsules based on aromatic–aromatic interactions with poly(sodium 4-styrenesulfonate)
Fecha
2014Registro en:
Reactive & Functional Polymers 81 (2014) 14–21
DOI: 10.1016/j.reactfunctpolym.2014.03.017
Autor
Araya Hermosilla, Esteban
Muñoz, Daniel
Orellana, Sandra
Yáñez, Alejandro
Olea, Andrés F.
Oyarzún Ampuero, Felipe
Moreno Villoslada, Ignacio
Institución
Resumen
Immobilization of rhodamine 6G in calcium alginate microcapsules was achieved using the polyanion
bearing negatively charged aromatic groups poly(sodium 4-styrenesulfonate) as complexing agent. The
immobilization of the dye by this method finds its basis on the stabilization of the dye/polymer complex
by short-range aromatic–aromatic interactions, which are resistant to the cleaving effect of highly concentrated
electrolytes. On the contrary, direct immobilization of the dye in the microcapsules resulted
unsuccessful due to its high diffusion coefficient in the aqueous medium, and complexation with
poly(sodium vinylsulfonate) did not improve the immobilization, since the corresponding complex is
based on long-range electrostatic interactions, which are easily cleaved under the high ionic strength
conditions of the microcapsule formation reaction. Thus, the present investigation represents a proof
of concept on the use of aromatic–aromatic interactions between polyelectrolytes bearing charged
aromatic rings and their aromatic counterions as a tool to achieve improved functionalities. The release
of the rhodamine 6G/poly(sodium 4-styrenesulfonate) complex from the microcapsules has been
investigated as a function of pH and temperature. Coating the microcapsules with chitosan allowed
minimizing the release of the dye from the microcapsules.