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Título

Rheological study of gel phenomena during epoxide network formation in the presence of sepiolite

Autor Nohales, Andrés; López, Daniel ; Culebras, Mario; Gómez, Clara M.
Palabras clave sepiolite
gelation
rheology
epoxy resin
Fecha de publicación 2013
EditorJohn Wiley & Sons
Citación Polymer International 62: 397-405 (2013)
ResumenThe dynamic behaviour during the crosslinking of an epoxy polymer near the gel point was monitored using rheological multiple frequency experiments. The influence of a needle-shaped inorganic nanofiller, sepiolite, either non-modified or organically surface modified during the cure process in the presence of an aliphatic and an aromatic hardener was investigated. The validity of various criteria for determining the gel point was examined for the crosslinking of these filled thermosets. The Winter-Chambon criterion at the gel point is obeyed by the unfilled and by the non-modified sepiolite-filled epoxy matrix with either of the two hardeners. However, physical gels are formed in the presence of the organically modified sepiolite and the Winter-Chambon criterion is not valid. For all the systems investigated, the nanofiller reduces the time to reach gelation. Critical relaxation exponents and gel strength have been determined indicating a more elastic and stronger gel in the presence of the aliphatic hardener.
URI http://hdl.handle.net/10261/110109
DOI10.1002/pi.4321
Identificadoresdoi: 10.1002/pi.4321
issn: 0959-8103
e-issn: 1097-0126
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