Abstract
Viscoelastic behavior of binary blends of narrow molecular-weight-distribution (MWD) polystyrenes (PS) of low and high molecular weights (coded as 1- and 2-chains, respectively) and of styrene-butadiene diblock copolymers (SB) and polybutadienes (hB) is analyzed in terms of the tube theory to elucidate the effects of entanglement by examining the relaxation modes exhibited by these blends. The results suggest that PS/PS blends exhibit the reptation, tube renewal and Rouse modes, and SB/hB blends the path breathing the tube renewal modes, depending on the molecular weights, the molecular weight ratios, and the composition of the blends. The onset of entanglement in monodisperse (flexible-linear) polymers may be interpreted as a change in the relaxation mode from Rouse to reptation occuring as a result of competition between the Rouse, reptation and tube renewal modes.
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