Abstract
The molecular picture of dynamic tube dilation (DTD) was tested for viscoelastic and dielectric data for two series of entangled binary blends of linear cis-polyisoprenes (PI) having 10-3M2 = 308 and 10-3M1 = 94.0 or 21.4. The volume fraction υ2 of the high-M chains was varied from 0.005 to 0.5. The Struglinski−Graessley parameter rSG (= M2Me2M1-3), specifying the constraint release (CR) contribution to the relaxation of high-M chains at small υ2, was quite different for the two series of blends (rSG = 0.0093 and 0.79). For large υ2 (= 0.5), the full-DTD picture treating the relaxed portions of the chains as a simple solvent held satisfactorily in the entire range of time t irrespective of the rSG value. However, on a decrease of υ2, this picture began to fail at intermediate t and further at long t (in the terminal regime of the high-M chains), and the failure was more significant for the blend with small rSG. This failure occurred when the number βCR(t) of the entanglement segments equilibrated through ...
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