Abstract
We consider internal friction of a Gaussian chain placed in vacuum. Dynamics of a single chain can be described by Langevin equation where the random force term comes from the random collisions of monomers among themselves. To nd the moment of these random forces, Gaussian distribution for chain conformation is used . Since collisions between monomers cause these forces, random forces on two monomers can be equal and opposite at the same time. Such correlation is exploited to nd friction constant for Fourier mode p. We show that this same mechanism of internal friction is also applicable for polymers in solution.
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