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Incoherent scattering function F s (Q,t) at Q = 0.3 Å−1 and T = 300 (red ), 350 (+), and 400 K (x), and at Q = 0.1 Å−1 and T = 350 K (brown ∇) digitized from Fig. 1 of Ref. 4 . At Q = 0.3 Å−1 and T = 300 K (green □), 350 K (green ◊), 400 K (green ○), and 500 K (red Δ) digitized from Ref. 2 . Slight upward shifts of the first set of data allow both sets to be seen. The solid lines are stretched exponential fits with values of β same as in B et al. The dashed blue lines are the fits by the stretched exponential with β = 0.50, i.e., Rousean dynamics. Note the discrepancies between the simulation results for Q = 0.3 Å−1 and T = 300 given in the Comment 2 from that in Ref. 4 . Lines indicate 2 ps, 60 ps, 1 ns, and 2 ns (from left to right).
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The Comment of Colmenero asserts no change in F s (Q,t) of the poly(ethylene oxide) (PEO) chains in blends with poly(methyl methacrylate) on crossing times of about 1–2 ns in data obtained by neutron scattering experiments and simulations. The assertion is opposite to that reported in the original papers where the neutron data and simulations were published. To make this point clear, we cite the data and the very statements made in the original papers concluding that indeed in the time interval from 60 ps to 1–2 ns the dynamics of PEO chain follows approximately the Rouse model, but becomes slower and departs from the Rouse model in the dependencies on time, momentum transfer, and temperature at longer times past t c = 1–2 ns. It is noteworthy that similar crossover of chain dynamics in entangled homopolymers at the ns time scale was found by neutron scattering.
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