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- W2092691569 abstract "For blends of styrene−butadiene (SB) diblock copolymers in entangling, high-M homopolybutadiene (hB) matrices, two-step viscoelastic relaxation behavior found in a previous study (Watanabe, H.; Kotaka. T. Macromolecules 1984, 17, 342) was reexamined to elucidate features of the fast process on the basis of recently accumulated knowledge for relaxation of homopolymer blends. The SB/hB blends contained spherical micelles with S cores and B corona. For the fast process, the micelles exhibited nearly universal dependence of reduced moduli, Gr* = [MbB/cbBRT]G*SB, on reduced frequencies, ωτ*, with cbB and MbB being the concentration of the B blocks in the hB matrix and the B block molecular weight, respectively, and τ* being the relaxation time of the fast process. Behavior of τ* changed with MbB, cbB, and the matrix molecular weight MhB. For dilute micelles with cbB < ce (entanglement threshold for the B blocks), the B blocks were entangled only with the hB matrix and τ* were found to be close to constraint release (CR) relaxation times τCR evaluated from data for star-hB blends. This result led us to attribute the fast process of the dilute micelles to CR relaxation of the B blocks due to the matrix motion. On the other hand, for concentrated micelles with cbB > ce, the B blocks were entangled with both hB matrix chains and B blocks of neighboring micelles. For MbB ≫ MhB, τ*conc of the concentrated micelles were longer than τCR and increased exponentially with cbB. For those micelles, τ*conc agreed well with those in a nonentangling matrix. However, with increasing MhB → MbB, τ*conc became insensitive to cbB and approached τCR. These results for the concentrated micelles were similar to those for homopolymer blends, suggesting that the CR mechanism affected the fast process of those micelles in the following way: For MbB ≫ MhB, the CR relaxation was rapid and entanglement between the matrix and the B blocks did not survive at time scales of τ*conc. Thus, at those time scales, the hB matrix behaved just as a diluent and the B blocks relaxed with a starlike (arm retraction) mechanism similar to that in the nonentangling matrix. On the other hand, for large MhB, the CR relaxation was retarded and the entanglement with the matrix still survived at time scales of τ*conc. For this case, the CR relaxation became a rate-determining step for the B block relaxation and led to the cbB-insensitive τ* (≅ τCR)." @default.
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- W2092691569 date "1996-01-01" @default.
- W2092691569 modified "2023-10-16" @default.
- W2092691569 title "Viscoelastic Relaxation of Styrene−Butadiene Diblock Copolymer Micellar Systems. 2. Behavior in Entangling, Long Polybutadiene Matrices" @default.
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- W2092691569 doi "https://doi.org/10.1021/ma951250g" @default.
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