INVESTIGADORES
ARENAS Gustavo Francisco
artículos
Título:
Chemical reactions affecting halloysite dispersion in epoxy nanocomposites
Autor/es:
SÁNCHEZ MANUEL; UICICH, JULIETA F.; ARENAS GUSTAVO F.; RODRÍGUEZ EXEQUIEL S.; MONTEMARTINI PABLO E.; PENOFF MARCELA E.
Revista:
JOURNAL OF APPLIED POLYMER SCIENCE
Editorial:
JOHN WILEY & SONS INC
Referencias:
Lugar: New York; Año: 2019 vol. 136
ISSN:
0021-8995
Resumen:
Halloysite nanotubes (HNTs) have attracted a technologic and scientific attention as reinforcements of epoxy‐based nanocomposites. However, their reported interaction with epoxy matrices is varied and the controlled dispersion of HNTs is still a challenge. In this work, we study the effect of chemical reactions taking place in the dispersion process of halloysite and their possible influence in the composite´s properties. HNTs´ surface was modified through an alkaline treatment and by grafting two aminosilanes with different chain lengths and functionality numbers. Evidence of homopolymerization and degradation reactions was found, depending on the surface treatment. The rheological study indicated that an interconnected network can be achieved in epoxy/HNTs blends depending on the surface chemical characteristics of the nanofillers and the blending method. The better dispersion was accomplished when ultrasonicating with the aid of a solvent. Nevertheless, the mechanical properties of the nanocomposites are not warranted by selecting a dispersion method.