The adsorption and diffusion of polydimethylsiloxane with various chain lengths on a (111) surface were studied. The chains all took up two-dimensional adsorption conformations on the surface, but differing conformations and dynamic properties were found in two different environments. The relationship between the adsorption energy of the different chain lengths and the degree of polymerization was linear and the average adsorption energy per segment was -0.42kcal/mol. The diffusion coefficient of the chains scaled with the degree of polymerization, N, as N-3/2.

A Study of the Adsorption and Diffusion Behavior of a Single Polydimethylsiloxane Chain on a Silicon Surface by Molecular Dynamics Simulation. Li, J.Q., Mu, D.: Advanced Materials Research, 2012, 391-392, 998-1002. See also: Journal of Theoretical and Computational Chemistry, 2012, 11[4], 697-708