Abstract
Viscoelastic and dielectric experiments were conducted for entangled binary blends of linear cis-polyisoprenes (PI) having widely separated molecular weights, M1 = 21.4 × 103 ≅ 4Me and M2 = 308 × 103 ≅ 62Me with Me (≅5 × 103) being the entanglement molecular weight. The PI chain had type-A dipoles and its global motion (end-to-end vector fluctuation) was dielectrically active. The volume fraction of the high-M chain, υ2, was varied from 0.005 to 1. The Struglinski-Graessley parameter for the blends, M2Me2/M13 = 0.79, was larger than a threshold value ≅0.5 necessary for the thermal constraint release (CR) mechanism to dominate the relaxation of the dilute high-M chains. Indeed, the Rouse-like CR relaxation was experimentally detected for the blends with small υ2 ≤ 0.01. For large υ2 (≥0.05), the high-M chains were entangled with each other (as well as with the low-M chains) and exhibited solution-like relaxation behavior at long times in their terminal regime. Comparison of viscoelastic and dielectric data...
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