Moderately concentrated solutions of polystyrene. I. Viscosity as a function of concentration, temperature, and molecular weight
1982; Wiley; Volume: 20; Issue: 5 Linguagem: Inglês
10.1002/pol.1982.180200513
ISSN1542-9385
Autores Tópico(s)Material Dynamics and Properties
ResumoAbstract Data on the viscosity η of moderately concentrated solutions of polystyrene are reported. Several solvents were investigated, including cyclopentane solutions over a temperature span between θ U = 19.5°C and θ L = 154.5°C. The data were analyzed in terms of a relation giving η as a function of α φ M , where α φ is the expansion factor for the chain dimensions in a solution with volume fraction φ of polymer with molecular weight M . It is shown that values of α φ so determined decrease as ∂ lnα φ /∂ lnφ = (1 − 2μ)/6μ for φ greater than φ * = 0.2 M / s 3 for moderately concentrated solutions, where s is the root‐mean‐square radius of gyration and μ = ∂ ln[η]/∂ ln M with [η] the intrinsic viscosity.
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