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The Langevin dynamics of a self - interacting chain embedded in a quenchedrandom medium is investigated by making use of the generating functional methodand one - loop (Hartree) approximation. We have shown how this intrinsicdisorder causes different dynamical regimes. Namely, within the Rousecharacteristic time interval the anomalous diffusion shows up. Thecorresponding subdiffusional dynamical exponents have been explicitlycalculated and thoroughly discussed. For the larger time interval the disorderdrives the center of mass of the chain to a trap or frozen state provided thatthe Harris parameter, $(\Delta/b^d) N^{2 - \nu d} \ge 1$, where $\Delta$ is adisorder strength, $b$ is a Kuhnian segment length, $N$ is a chain length and$\nu$ is the Flory exponent. We have derived the general equation for the non -ergodicity function $f(p)$ which characterizes the amplitude of frozen Rousemodes with an index $p = 2\pi j/N$. The numerical solution of this equation hasbeen implemented and shown that the different Rouse modes freeze up at the samecritical disorder strength $\Delta_c \sim N^{-\gamma}$ where the exponent$\gamma \approx 0.25$ and does not depend from the solvent quality.Comment: 17 pages, 6 figures, submitted to EPJB (condensed matter

Polymer chain in a quenched random medium: slow dynamics and ergodicity breaking