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Fully atomistic molecular dynamics(MD)simulations are employed to study the swelling behavior of poly(methyl methacrylate-co-n-butyl methacrylate)(P(MMA-co-n-BMA))immersed in water.The chemical potential of water is calculated using the thermodynamic integration method to estimate the equilibrium swelling(ES)point.The solvation free energy,radial distribution functions(RDFs)and water structures are investigated to study the swelling process.