Producción CyT
Congreso
Autoría
Ileana A. Zucchi
;
SCHROEDER, WALTER FABIAN
Fecha
2014
Editorial y Lugar de Edición
World Polymer Congress - Macro 2014
Resumen
Información suministrada por el agente en
SIGEVA
This report describes the preparation of thermoset epoxy matrix containing self-assembled nanostructures of a low-molecular-weight poly(ethylene oxide)-poly(ethylene) (PEO-b-PE) diblock copolymer. The preparation of these nanostructured materials involves firstly the dissolution of PEO-b-PE in an epoxy monomer of the type diglycidyl ether of bisphenol A (DGEBA) at 150 ºC followed by polymerization at room temperature via cationic photopolymerization mechanism (induced by visible light expo...
This report describes the preparation of thermoset epoxy matrix containing self-assembled nanostructures of a low-molecular-weight poly(ethylene oxide)-poly(ethylene) (PEO-b-PE) diblock copolymer. The preparation of these nanostructured materials involves firstly the dissolution of PEO-b-PE in an epoxy monomer of the type diglycidyl ether of bisphenol A (DGEBA) at 150 ºC followed by polymerization at room temperature via cationic photopolymerization mechanism (induced by visible light exposure). DGEBA monomer undergoes slow photoinitiated polymerization allowing the growth of block copolymer nanoribbons during this term. Transmission electron microscopy (TEM) analysis of samples containing up to 20 wt% PEO-b-PE showed elongated nanoribbons dispersed in the epoxy matrix without any macroscopic phase separation evidence. The micelle structure consisted in a semicrystalline PE core surrounded by a PEO shell. These micelles were typically on the order of 20 to 30 nm in width with variable lengths, comprised between 1 and greater than 10 microns, depending on block copolymer concentration. Small angle X-ray scattering (SAXS) experiments evidenced a lamellar array that increase its intensity with the PEO-b-PE content.
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Palabras Clave
NANORIBBONMICELLEEPOXYBLOCK-COPOLYMER