Artículo
Photopolymerization-assisted self-assembly as a strategy to obtain a dispersion of very high aspect ratio nanostructures in a polystyrene matrix
Montoya Rojo, Ursula Maria
; Riccardi, Carmen Cristina
; Ninago, Mario Daniel
; Ciolino, Andrés Eduardo
; Villar, Marcelo Armando
; Ceolin, Marcelo Raul
; Zucchi, Ileana Alicia
; Schroeder, Walter Fabian
Fecha de publicación:
10/2018
Editorial:
Pergamon-Elsevier Science Ltd
Revista:
European Polymer Journal
ISSN:
0014-3057
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Very high aspect ratio nano-objects dispersed in a polymer matrix impart a number of desired characteristics to the material, such as barrier properties to the diffusion of small molecules. Commonly, these dispersions are obtained via top-down procedures that require several time-consuming steps of purification, surface modification, and processing. In this article, we show that it is possible to produce a dispersion of crystalline nano-objects of very high aspect ratio through an in situ approach based on photopolymerization-driven self-assembly. For this purpose, a synthesized poly(styrene-block-ε-caprolactone) (PS-b-PCL) block copolymer was dissolved in styrene (St) monomer, and the solution was slowly photopolymerized at room temperature. Under such conditions, long crystalline nanoribbons dispersed in a PS matrix were obtained after four days of irradiation. The nanostructuration process was investigated by in situ small-angle X-ray scattering (SAXS), wide-angle X-ray diffraction (XRD), and transmission electron microscopy (TEM). Obtained results allowed us to conceptualize the formation mechanism of nanoribbons as a stepwise micellization-crystallization-growth process. When photopolymerization at room temperature was replaced by thermal polymerization at 90 °C, a dispersion of amorphous nanorods was obtained. This demonstrated that crystallization of PCL blocks played a dominant role in determining the morphology of the very high aspect ratio nano-objects obtained by photopolymerization.
Palabras clave:
Block copolymers
,
Self-assembly
,
Photopolymerization
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Articulos(CCT - MENDOZA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MENDOZA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MENDOZA
Articulos(INIFTA)
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos(INTEMA)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Articulos(PLAPIQUI)
Articulos de PLANTA PILOTO DE INGENIERIA QUIMICA (I)
Articulos de PLANTA PILOTO DE INGENIERIA QUIMICA (I)
Citación
Montoya Rojo, Ursula Maria; Riccardi, Carmen Cristina; Ninago, Mario Daniel; Ciolino, Andrés Eduardo; Villar, Marcelo Armando; et al.; Photopolymerization-assisted self-assembly as a strategy to obtain a dispersion of very high aspect ratio nanostructures in a polystyrene matrix; Pergamon-Elsevier Science Ltd; European Polymer Journal; 112; 10-2018; 704-713
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