Artículo
Conjugated polymer nanoparticles as unique coinitiator-free, water-soluble, visible-light photoinitiators of vinyl polymerization
Gallastegui, Antonela
; Spada, Ramiro Martín
; Cagnetta, Gonzalo Emanuel
; Ponzio, Rodrigo Andrés
; Martinez, Sol Romina
; Previtali, Carlos Mario
; Gómez, María Lorena; Palacios, Rodrigo Emiliano
; Chesta, Carlos Alberto
Fecha de publicación:
04/2020
Editorial:
Wiley VCH Verlag
Revista:
Macromolecular Rapid Communications
ISSN:
1022-1336
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The use of conjugated polymer nanoparticles (CP NPs) of poly(9,9-dioctylfluorene-alt-benzothiadiazole) and poly(9,9-di-n-octylfluorenyl-2,7-diyl) as efficient photoinitiator systems (PIS) of vinyl polymerization in water is reported herein. CP NPs are biocompatible, excitable with blue commercial LEDs and, unlike visible light Type II PIS, do not need co-initiators to trigger a monomer chain reaction. CP NPs photoinitiate polymerization of a variety of acrylic monomers with initiation rates comparable to those observed for well-known Type II PIS. Given the extraordinarily large molar absorption coefficients of CP NPs (≈108 m-1 cm-1) very low particle concentration is required for effective polymerization. Additionally, CP NPs behave as conventional macrophotoinitiators significantly reducing contamination risks due to leaching of low molecular weight byproducts. These combined features make CP NPs PIS suitable to synthesize polymeric materials for many healthcare and biomedical applications including drug delivery, tissue engineering, prosthetic implants, and food/medicine packaging. These CP NPs PIS are also used to synthesize nano-hydrogels with a relatively narrow and controlled size distribution in the absence of surfactants. It is proposed that polymerization is initiated at the CP NPs surface by photogenerated free polarons, in close analogy to the mechanism previously described for PIS based on inorganic semiconductor NPs.
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Articulos (IITEMA)
Articulos de INSTITUTO DE INVESTIGACIONES EN TECNOLOGIAS ENERGETICAS Y MATERIALES AVANZADOS
Articulos de INSTITUTO DE INVESTIGACIONES EN TECNOLOGIAS ENERGETICAS Y MATERIALES AVANZADOS
Citación
Gallastegui, Antonela; Spada, Ramiro Martín; Cagnetta, Gonzalo Emanuel; Ponzio, Rodrigo Andrés; Martinez, Sol Romina; et al.; Conjugated polymer nanoparticles as unique coinitiator-free, water-soluble, visible-light photoinitiators of vinyl polymerization; Wiley VCH Verlag; Macromolecular Rapid Communications; 41; 8; 4-2020; 1-5
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