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Mohanty, Sanat
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article
Effect of uniformly applied force and molecular characteristics of a polymer chain on its adhesion to graphene substrates
Abstract
The force-induced desorption of a polymer chain from a graphene substrate is studied with Molecular Dynamics (MD). A critical force needs to be exceeded before detachment of the polymer from the substrate. It is found for a chain to exhibit good adhesive properties the chain configuration should consist of fibrils - elongated, aligned sections of polymers and cavities which dissipate the applied energy. We focus on the molecular properties of the polymer chain which can lead to large amounts of fibrillation and find both strong attraction between polymer and substrate and good solvency conditions are important conditions for this. We also vary the stiffness of the chain and find for less stiff chains a plateau in the stress-strain curve gives rise to good adhesion but for very stiff chains there is limited elongation of the chain.