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- W4248451544 abstract "Light scattering and viscosity measurements were made on anionically polymerized four-arm star polystyrene samples with weight-average molecular weights Mw of 8.5 × 104 to 3.1 × 106 in cyclohexane at different temperatures to determine the mean-square radius of gyration 〈S2〉, the second and third virial coefficients (A2 and A3), and the intrinsic viscosity. The values of A3 at the ϑ point (34.5 °C), where A2 for any sample was essentially zero, were about 5 × 10-4 cm6 mol g-3 and yielded a value of 4 × 10-45 cm6 for the ternary cluster integral. It was shown that although the binary cluster approximation breaks down for A3 near ϑ, it holds for 〈S2〉 and A2, as is the case with linear chains, if the binary cluster integral is replaced by a linear combination of the binary and ternary cluster integrals. The expansion factor αS2 for 〈S2〉 and that for the intrinsic viscosity plotted against the excluded-volume parameter z in the coil limit for Mw > 8 × 105 came close to the known relations for linear polystyrene of high molecular weight in cyclohexane. On the other hand, the relation between the interpenetration function Ψ and αS3 for the star polymer appeared far above that for the linear chain at temperatures above ϑ. These experimental results for αS2 and Ψ were quantitatively explained by the interpolation formulas constructed in this work." @default.
- W4248451544 created "2022-05-12" @default.
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- W4248451544 date "1997-12-01" @default.
- W4248451544 modified "2023-10-17" @default.
- W4248451544 title "Excluded-Volume Effects in Star Polymer Solutions: Four-Arm Star Polystyrene in Cyclohexane near the ϑ Temperature" @default.
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- W4248451544 doi "https://doi.org/10.1021/ma970929c" @default.
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