Etude en solution diluée des propriétés du polystyrène ramifié en étoile

Meunier, Jean‐Claude; Leemput, Robert Van

doi:10.1002/macp.1971.021470117

Cited by 40 publications

(9 citation statements)

References 71 publications

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“…There have been more reports on the effect of star branching on (M w ) than there have been studies of star polymer cloud points or coexistence curves. Studies of (M w ) include sPS-CH, 18,[42][43][44][45][46] sPSdecalin, 47 sPS-toluene, 44,47 and star polyiso-EIGHT-ARM STAR POLYSTYRENE prene/dioxane. 15 In many cases, the temperature is lowered, and in some cases, it is unaffected.…”

Section: Effect Of Polymer Branching On Miscibilitymentioning

confidence: 99%

Eight‐arm star polystyrene in methylcyclohexane: Cloud‐point curves, critical lines, and coexisting densities and viscosities

Alessi

Bittner

Greer

2003

J Polym Sci B Polym Phys

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We measured the cloud‐point curves of eight‐arm star polystyrene (sPS) in methylcyclohexane (MCH) for polymer samples of three total molecular masses [weight‐average molecular weight (Mw) × 10−3 = 77, 215, or 268]. We found a downward shift of 5–15 K in the critical temperature (Tc) of the star polymer solutions with respect to linear polystyrene (PS) solutions of the same Mw. The shift in Tc became smaller as Mw increased. The critical volume fraction for eight‐arm sPS in MCH was equal within experimental uncertainty (10–40%) to that of linear PS in MCH. For sPS of Mw = 77,000 in MCH, we studied the mass density (ρ) as a function of temperature (T). As for linear polymers in solution, the difference in ρ between coexisting phases (Δρ) could be described over t = (Tc − T)/Tc for 1.1 × 10−4 < t < 4.7 × 10−3 with the Ising value of the exponent β in the expression Δρ = B tβ. Both ρ(T) above Tc and the average value of ρ below Tc were linear functions of temperature; no singular corrections were observed. The measurements of the shear viscosity (η) near Tc for sPS (Mw = 74,000) in MCH indicated a strong critical anomaly in η, but the data were not precise enough for a quantitative analysis. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 129–145, 2004

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Section: Effect Of Polymer Branching On Miscibilitymentioning

confidence: 99%

Eight‐arm star polystyrene in methylcyclohexane: Cloud‐point curves, critical lines, and coexisting densities and viscosities

Alessi

Bittner

Greer

2003

J Polym Sci B Polym Phys

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“…The maximum is found for any x r being equal to one, and all the others hence being zero, so c max = 1 (12) which is equal to the contraction factor of a linear molecule.…”

Section: Minimum and Maximum Values Of Cmentioning

confidence: 99%

On the Contraction Factor of Star-Branched Polymers with Flory-Distributed Arms

Versluis¹,

Hillegers

2002

Macromol. Theory Simul.

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“…In this figure, a chain line indicates the result for linear polymers; a portion of the line having a slope of 1 shows prediction from the extended Rouse theory, Polymer J., Vol. 16…”

Section: Steady-state Compliancementioning

confidence: 99%

Characterization and Rheological Properties of Multi-Branched Star Polystyrenes

Masuda

Ohta

Yamauchi

et al. 1984

Polym J

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The star polymer samples were prepared by coupling narrow-distribution polystyryl anions with divinylbenzene and were characterized in terms of molecular weight, molecular weight distribution and coupling ratio. Dynamic viscoelastic properties of star-shaped polystyrenes having different molecular weights (M, = 1.3 20 x 10") and numbers (P= 7 39) of branches have been measured. The zero-shear viscosity '1o depends strongly upon the molecular weight at constant P, while it depends much less at constant M,. Molecular weight dependence of the steady-state compliance Je o are quite complicated. Je o increases with increasing molecular weight at constant P. When M, is constant, Je o is independent of molecular weight at P 7 and increases at P?. 7. Values of Je o are higher than those for the corresponding linear polymers. Relaxation spectra for star-shaped polystyrenes having many (P?. 15) branches exhibit a two-step change on the long-time side. These two sets of relaxation times are attributed to the relaxation mechanism associated with ordinary intermolecular entanglements and to that peculiar to branched polymers. The difference in the entanglement compliance for branched and linear polymers is smaller than that in Je o.

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Etude en solution diluée des propriétés du polystyrène ramifié en étoile

Cited by 40 publications

References 71 publications

Eight‐arm star polystyrene in methylcyclohexane: Cloud‐point curves, critical lines, and coexisting densities and viscosities

Eight‐arm star polystyrene in methylcyclohexane: Cloud‐point curves, critical lines, and coexisting densities and viscosities

On the Contraction Factor of Star-Branched Polymers with Flory-Distributed Arms

Characterization and Rheological Properties of Multi-Branched Star Polystyrenes

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