Viscoelastic Properties of Polymer Nanocomposites with Polydispersity in Nanoparticle Sizes

Koteswara Rao Medidhi; Venkat Padmanabhan

International Journal of Polymer Science and Engineering

Viscoelastic Properties of Polymer Nanocomposites with Polydispersity in Nanoparticle Sizes

Abstract

The viscoelastic properties of polymer nanocomposites are investigated as a function of the size distribution of nanoparticles, the nature of interactions and results are compared with the pure polymer melt. We modeled our PNCs with two sizes of nanoparticles and polymer blends and four different cases with different polymer-nanoparticle and nanoparticle-nanoparticle non-bonded interactions. We have observed the enhancement in properties is not only due to the addition of nanoparticles but also due to the role of the interface between polymer chains and nanoparticles. The viscosity was unaffected by an increase in the presence of bigger nanoparticle with neutral interactions, which is due to the low concentration of nanoparticle. In presence of attractive interactions between polymer and nanoparticles, we observed viscosity of system monotonically decreased with an increase in the presence of bigger nanoparticle, which is due to a decrease in the availability of surface area of nanoparticle for polymer segments to adsorb. In the presence of long-range attractions between small and big nanoparticles, we observed non-monotonous behavior due to the interactions between the particles. It was observed that smaller size nanoparticles formed a thick layer on the polymer layer on big nanoparticles because of interactions that lead to enhancement in the visco-elastic properties by decreasing in the dynamics of polymer chains. Our results indicate that the local chain dynamics and the behavior of monomer segments at the polymer-particle interface have a strong influence on the viscoelastic behavior of polymer nanocomposites.

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How to cite

Koteswara Rao Medidhi, Venkat Padmanabhan. Viscoelastic Properties of Polymer Nanocomposites with Polydispersity in Nanoparticle Sizes. International Journal of Polymer Science and Engineering. 2020;5(2):42–52.

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Viscoelastic Properties of Polymer Nanocomposites with Polydispersity in Nanoparticle Sizes

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