Interfacial molecular dynamics of styrenic block copolymer-based nanocomposites with controlled spatial distribution

Helal, E., Amurin, L. G., Carastan, D. J., de Sousa Jr, R. R., David, E., Fréchette, M. et Demarquette, N. R.. 2017. « Interfacial molecular dynamics of styrenic block copolymer-based nanocomposites with controlled spatial distribution ». Polymer, vol. 113. pp. 9-26.
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Résumé

The dielectric properties of nanocomposites of polystyrene-b-poly (ethylene-co-butylene)-b-polystyrene (SEBS) triblock copolymers containing organically modified clay nanoparticles featuring controlled spatial orientation at the nanoscale: isotropic, totally oriented and partially oriented, have been investigated and correlated with the nanocomposite morphologies. A slow dielectric relaxation process attributed to elastomer chains with reduced mobility confined at nanoparticle/polymer interphase was observed in all the nanocomposites and was found to be dependent on the orientation of nanoclay and polystyrene (PS) domains, the location of clay tactoids as well as the PS block fraction. A dielectric “interfacial” glass transition temperature Tgi assigned to this characteristic relaxation was estimated to occur at temperatures ranging between 6 °C and 35 °C depending on the nanocomposite, which is much higher than the bulk rubber phase glass transition temperature, normally lower than −40 °C for the studied block copolymers. Interestingly, the highest Tgi were associated with the nanocomposites featuring random or partial orientation and/or selective location of nanoparticles in the rubber phase.

Type de document:	Article publié dans une revue, révisé par les pairs
Professeur:	Professeur David, Éric Demarquette, Nicole R.
Affiliation:	Génie mécanique, Génie mécanique
Date de dépôt:	21 févr. 2017 14:39
Dernière modification:	09 févr. 2019 05:00
URI:	https://espace2.etsmtl.ca/id/eprint/14661

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