Anjikar, Ajinkya Deepak and Shantha, Balaji Iyer Vaidyanathan
(2019)
Dynamic Response of Cross Linked Polymer Grafted
Nanoparticle to Imposed Oscillatory Shear Deformation.
Masters thesis, Indian Institute of Technology Hyderabad.
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Abstract
End functionalized Polymer Grafted Nanoparticles (PGNs) form bonds when their
coronas overlap. We study the local dynamic response of a system composed of three
such interacting PGNs using oscillatory shear simulations based on a multicomponent
model. In particular, we study the effect of number of grafted arms ( f = 600, 900,
1200), frequency of oscillation (ω = 10-2
, 10-4
, 10-6
) and amplitude of oscillation ( =
5%, 10% and 15%) on evolution of number of bonds between PGNs and dynamic
response of the PGN system.
We observe that both net shear force and number of bonds between the PGNs depends
on number of grafted arms, frequency and amplitude of oscillation. In particular, as
grafting density increases, the magnitude of net shear force on moving particle and
number of bonds between PGNs increases. Furthermore, breaking and formation of
bonds between PGNs was pronounced at lower frequency and decreased with increase
in frequency. We observe that oscillatory shear gives rise to nonlinearities and the
nonlinear behavior becomes pronounced with increase in strain amplitude at all
frequencies and grafting density values. We employ Chebyshev polynomials of first
kind to analyze the observed nonlinearities.
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