The development of advanced polymer nanocomposites requires a strong filler-polymer interfacial interaction and an optimal filler nanodispersion. The incorporation of the clays into a polymer matrix frequently does not improve the composite mechanical properties, owing to both poor dispersion and macroscopic particle dimensions. In this work, pristine and organically-modified sepiolites (Sep) were structurally modified by an acid treatment, which provides nano-sized sepiolite (NS-Sep) fibers with reduced particle size and increased silanol groups on the surface layer. NS-Sep fibers were used to prepare styrene-butadiene rubber nanocomposites with enhanced mechanical properties. Dynamic-mechanical analysis of clay polymer nanocomposites demonstrated that the NS-Sep fibers provided an excellent balance between reinforcing and hysteretic behavior, compared to the large-sized pristine Sep and isotropic silica. This was related to the enhanced interfacial chemical interaction between NS-Sep and rubber, as well as to the size and self-assembly of anisotropic nanofibers to form filler network structures, as supported by transmission electron microscopy analysis. The preparation of nanocomposites, based on Sep nanofibers obtained by a simple and versatile acid treatment, can thus be considered an alternative approach for the designing of advanced clay polymer nanocomposites

Di Credico, B., Cobani, E., Callone, E., Conzatti, L., Cristofori, D., D'Arienzo, M., et al. (2018). Size-controlled self-assembly of anisotropic sepiolite fibers in rubber nanocomposites. APPLIED CLAY SCIENCE, 152, 51-64 [10.1016/j.clay.2017.10.032].

Size-controlled self-assembly of anisotropic sepiolite fibers in rubber nanocomposites

Di Credico, Barbara
Primo
;
Cobani, Elkid;D'Arienzo, Massimiliano;Scotti, Roberto;Tadiello, Luciano;Morazzoni, Franca
2018

Abstract

The development of advanced polymer nanocomposites requires a strong filler-polymer interfacial interaction and an optimal filler nanodispersion. The incorporation of the clays into a polymer matrix frequently does not improve the composite mechanical properties, owing to both poor dispersion and macroscopic particle dimensions. In this work, pristine and organically-modified sepiolites (Sep) were structurally modified by an acid treatment, which provides nano-sized sepiolite (NS-Sep) fibers with reduced particle size and increased silanol groups on the surface layer. NS-Sep fibers were used to prepare styrene-butadiene rubber nanocomposites with enhanced mechanical properties. Dynamic-mechanical analysis of clay polymer nanocomposites demonstrated that the NS-Sep fibers provided an excellent balance between reinforcing and hysteretic behavior, compared to the large-sized pristine Sep and isotropic silica. This was related to the enhanced interfacial chemical interaction between NS-Sep and rubber, as well as to the size and self-assembly of anisotropic nanofibers to form filler network structures, as supported by transmission electron microscopy analysis. The preparation of nanocomposites, based on Sep nanofibers obtained by a simple and versatile acid treatment, can thus be considered an alternative approach for the designing of advanced clay polymer nanocomposites
Articolo in rivista - Articolo scientifico
Filler networking; Organoclay; Rubber nanocomposite; Self-assembly; Sepiolite; Geology; Geochemistry and Petrology;
English
2018
152
51
64
partially_open
Di Credico, B., Cobani, E., Callone, E., Conzatti, L., Cristofori, D., D'Arienzo, M., et al. (2018). Size-controlled self-assembly of anisotropic sepiolite fibers in rubber nanocomposites. APPLIED CLAY SCIENCE, 152, 51-64 [10.1016/j.clay.2017.10.032].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/179706
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