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Rouse 2D Diffusion of Polymer Chains in Low Density Precursor Films of Polybutadiene Melts
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posted on 2020-05-25, 15:03 authored by Claire Schune, Marc Yonger, Mohamed Hanafi, Jürgen Thiel, Laurent Guy, Thomas Chaussée, François Lequeux, Hélène Montes, Emilie VerneuilWe took advantage
of pseudopartial wetting to promote the spreading of precursor films
whose surface density smoothly decays to zero away from a sessile
droplet. By following the spreading dynamics of semidilute precursor
films of polybutadiene melts on silicon wafers, we measure molecular
diffusion coefficients for different molar masses and temperatures.
For homopolymers, chains follow a thermally activated 2D Rouse diffusion
mechanism, with an activation energy revealing polymer segment interactions
with the surface. This Rouse model is generalized to chains with specific
terminal groups.