Star polymer slow mode

V.4. Effects of Configuration and Entanglement We also demonstrated the effect of configuration on the dynamic behavior of semidilute polymer solutions. Different results have been obtained by adding to the matrix a 4-arm star polystyrene SPS4 which was comparable with the linear test chain LPS2 in number and size. First, the self-diffusion (the slow mode) became invisible (disappeared). Second, the cooperative diffusion became faster. 

Star polymer solutions can exhibit a slow mode. Huber, et al. find that such a mode appears for a 467 kDa 12-arm polystyrene star in toluene at concentrations > 50 g/1 3/[r/](50). The D/ of the fast mode did not depend on q -.D of the slow... 

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