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- W2134761895 abstract "Abstract A series of eighteen‐arm regular star polybutadienes with molecular weights between 9.9 × 10 4 and 1.9 × 10 6 were prepared and characterized. Evidence is presented for the expanded configuration of the large eighteen‐arm stars in a θ solvent. The intrinsic viscosities of the eighteen‐arm stars gave g′ = [η]/[η] l = 0.28 4 in dioxane at 27°C (θ solvent) and 0.22 5 in toluene at 35°C (good solvent). The linear viscoelastic properties of the melts were also determined. The plateau modulus, G N °, is the same as for linear polybutadiene. The zero‐shear viscosities (η 0 ) and the longest relaxation times ( T max ) increase exponentially with the arm molecular weight M a and are identical to those of four‐arm polybutadienes with the same M a . The zero‐shear recoverable compliance ( J e °) increases linearly with molecular weight. v ′ in J e ° G N ° = v ′ N a , where N a is the number of entanglements per arm, is 0.95 slightly larger than 0.66 for four‐arm polybutadienes. Similarly, g 2 is higher than calculated from the Rouse–Ham theory." @default.
- W2134761895 created "2016-06-24" @default.
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- W2134761895 date "1986-11-01" @default.
- W2134761895 modified "2023-10-14" @default.
- W2134761895 title "Synthesis and properties of eighteen-arm polybutadienes" @default.
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- W2134761895 doi "https://doi.org/10.1002/pola.1986.080241127" @default.
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