Linear viscoelastic properties of mixtures of 3- and 4-arm polybutadiene stars |
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Authors: | N. Hadjichristidis J. Roovers |
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Affiliation: | Division of Chemistry, National Research Council of Canada, Ottawa, Ontario, Canada |
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Abstract: | The viscoelastic properties of a three-arm and a four-arm star polybutadiene with the same arm molecular weight (Ma) were studied. The zero-shear recoverable compliance (J0e) and plateau modulus (G0N) for these stars are the same. The zero-shear viscosity (η0) of the three-arm star is 20% lower than that of the four-arm star. Mixtures of the stars had J0e and G0N unchanged. A mixture of the three- and four-arm star was diluted with a low molecular weight linear polybutadiene. G0N∝ø2; J0e∝ø?1 and Me∝ø?1, as expected for dilution with a θ-solvent. |
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Keywords: | viscoelasticity polybutadiene star polymer viscosity zero-shear compliance dilution |
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