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Linear viscoelasticity of spherical SiO2 nanoparticle - tethered poly(butyl acrylate) hybrids / Vivek Goel in Industrial & engineering chemistry research, Vol. 49 N° 23 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 11985–11990 Titre : Linear viscoelasticity of spherical SiO2 nanoparticle - tethered poly(butyl acrylate) hybrids Type de document : texte imprimé Auteurs : Vivek Goel, Auteur ; Joanna Pietrasik, Auteur ; Krzysztof Matyjaszewski, Auteur Année de publication : 2011 Article en page(s) : pp. 11985–11990 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Viscoelasticity  Nanoparticle Résumé : The melt state linear viscoelastic properties of spherical silica nanoparticles with grafted poly(n-butyl acrylate) chains of varying molecular weight were probed using linear small amplitude dynamic oscillatory measurements and complementary linear stress relaxation measurements. While the pure silica-tethered−polymer hybrids with no added homopolymer exhibit solid-like response, addition of matched molecular weight free matrix homopolymer chains to this hybrid, at low concentrations of added homopolymer, maintains the solid-like response with a lowered modulus that can be factored into a silica concentration dependence and a molecular weight dependence. While the silica concentration dependence of the modulus is strong, the dependence on molecular weight is weak. On the other hand, increasing the amount of added homopolymer changes the viscoelastic response to that of a liquid with a relaxation time that scales exponentially with hybrid concentration. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1007129 [article] Linear viscoelasticity of spherical SiO2 nanoparticle - tethered poly(butyl acrylate) hybrids [texte imprimé] / Vivek Goel, Auteur ; Joanna Pietrasik, Auteur ; Krzysztof Matyjaszewski, Auteur . - 2011 . - pp. 11985–11990. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 11985–11990 Mots-clés : Viscoelasticity  Nanoparticle Résumé : The melt state linear viscoelastic properties of spherical silica nanoparticles with grafted poly(n-butyl acrylate) chains of varying molecular weight were probed using linear small amplitude dynamic oscillatory measurements and complementary linear stress relaxation measurements. While the pure silica-tethered−polymer hybrids with no added homopolymer exhibit solid-like response, addition of matched molecular weight free matrix homopolymer chains to this hybrid, at low concentrations of added homopolymer, maintains the solid-like response with a lowered modulus that can be factored into a silica concentration dependence and a molecular weight dependence. While the silica concentration dependence of the modulus is strong, the dependence on molecular weight is weak. On the other hand, increasing the amount of added homopolymer changes the viscoelastic response to that of a liquid with a relaxation time that scales exponentially with hybrid concentration. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1007129