  Dynamics of a polymer chain in solution gets significantly affected by the
temperature and the frictional forces arising due to solvent viscosity. Here,
using an explicit solvent framework for polymer simulation with the liberty to
tune the solvent viscosity, we study the nonequilibrium dynamics of a flexible
homopolymer when it is suddenly quenched from an extended coil state in good
solvent to poor solvent conditions. Results from our extensive simulations
reveal that depending on the temperature $T$ and solvent viscosity, one
encounters long-lived sausage-like intermediates following the usual
pearl-necklace intermediates. Use of shape factors of polymers allows us to
disentangle these two distinct stages of the overall collapse process, and the
corresponding relaxation times. The relaxation time $\tau_s$ of the sausage
stage, which is the rate-limiting stage of the overall collapse process,
follows an anti-Arrhenius behavior in the high-$T$ limit, and the Arrhenius
behavior in the low-$T$ limit. Furthermore, the variation of $\tau_s$ with the
solvent viscosity provides evidence of internal friction of the polymer, that
modulates the overall collapse significantly, analogous to what is observed for
relaxation rates of proteins during their folding. This suggests that the
origin of internal friction in proteins is plausibly intrinsic to its polymeric
backbone rather than other specifications.
