Linear Viscoelasticity of Spherical SiO 2 Nanoparticle-Tethered Poly(butyl acrylate) Hybrids
KAUST Grant NumberKUS-C1-018-02
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AbstractThe 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. © 2010 American Chemical Society.
CitationGoel V, Pietrasik J, Matyjaszewski K, Krishnamoorti R (2010) Linear Viscoelasticity of Spherical SiO 2 Nanoparticle-Tethered Poly(butyl acrylate) Hybrids . Ind Eng Chem Res 49: 11985–11990. Available: http://dx.doi.org/10.1021/ie1007129.
SponsorsV.G. and R.K. gratefully acknowledge the partial support of the National Science Foundation (CMMI-0708096). This publication is based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). J.P. and K.M. thank the Kosciuszko Foundation, Ministry of Science and Higher Education (Grant No. N508 3820 33) and the National Science Foundation (DMR-09-69301) for financial support.
PublisherAmerican Chemical Society (ACS)