Correlation between grafted nanoparticle-matrix polymer interface wettability and slip in polymer nanocomposites

Ibrahim, Mohd and Begam, Nafisa and Padmanabhan, Venkat and Basu, JK (2018) Correlation between grafted nanoparticle-matrix polymer interface wettability and slip in polymer nanocomposites. In: SOFT MATTER, 14 (29). pp. 6076-6082.

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Abstract

Controlling and understanding the flow properties of polymer nanocomposites (PNC) is very important in realising their potential for various applications. In this study we report molecular dynamics simulation studies of slip between a rotating polymer-grafted nanoparticle and the surrounding free linear matrix chains. By varying the interface wettability between the nanoparticle and matrix chains defined by the parameter f, the ratio of the graft to the matrix chain length, or the graft chain density, Sigma, we were able to tune the interface slip, delta, significantly. Both f and Sigma alter the interface wettability by changing the matrix chain penetration depth, lambda, into the graft chain layer. We observed a large value of delta at smaller f or Sigma which reduces with an increasing value of the respective parameters. Since interface slip is also likely to affect other properies of PNCs, like viscosity and the glass transition, we suggest that these parameters could become useful tools to control the flow and mechanical properties of PNCs made with grafted nanoparticles.

Item Type:	Journal Article
Publication:	SOFT MATTER
Publisher:	ROYAL SOC CHEMISTRY
Additional Information:	Copyright of this article belongs to ROYAL SOC CHEMISTRY
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	31 Dec 2018 17:33
Last Modified:	31 Dec 2018 17:33
URI:	http://eprints.iisc.ac.in/id/eprint/61258

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