Structure and linear viscoelasticity of polymer nanocomposites with agglomerated particles

Published Date

19 August 2016, Vol.98:190–200, doi:10.1016/j.polymer.2016.06.028

Title 

Structure and linear viscoelasticity of polymer nanocomposites with agglomerated particles

• Author 

• Wei Yu ^,
• Jun Wang
• Wei You

• Advanced Rheology Institute, Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai 200240, PR China

Received 15 March 2016. Revised 20 May 2016. Accepted 10 June 2016. Available online 14 June 2016.

Highlights

• •A new image analysis method and a rheological method were suggested to determine the local volume fraction inside agglomerates.
• •The nanocomposites with aggregated particles is regarded as an emulsion.
• •A two-phase model was suggested to describe the linear viscoelasticity of polymer nanocomposites.

Abstract

The connection between the structures and the linear viscoelasticity was revealed in this work for polymer nanocomposites containing agglomerated particles. A new image analysis method using the greyscale histogram of TEM images was suggested to determine the local volume fraction of nanoparticles inside an agglomerate, which represents the degree of agglomeration. It is found that the local volume fraction of nanoparticles is strongly related to the particle-polymer interaction. Such result was justified by a new rheological analysis based on the recently suggested modulus decomposition in the linear viscoelastic properties of polymer nanocomposites, from which the combined shift factor due to the hydrodynamic effect was used to quantify the local volume fraction of nanoparticles. Moreover, a two phase model was suggested to describe the linear viscoelasticity of such polymer nanocomposites. The success of this model in different polymer nanocomposites implies the rationality to regard the isolated agglomerate as a composite droplet in the polymer matrix.

Graphical abstract

Keywords

• Nanocomposites
• Rheology
• Structure

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• ∗ 
  Corresponding author.

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