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  • 1
    Electronic Resource
    Electronic Resource
    Melt viscosity of linear and branched poly(butyleneisophthalate) (1988)
    Springer
    Rheologica acta 27 (1988), S. 145-149 
    Details
    ISSN: 1435-1528
    Keywords: Meltviscosity ; pseudoplasticpolyester ; linearpoly(butyleneisophthalate) ; branchedpoly(butyleneisophthalate)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Linear and branched poly(butyleneisophthalate) samples were synthesized and characterized in terms of the intrinsic viscosity, the molecular weight and the melt viscosity over a wide range of shear rates at 200 °C. An exponent of about 4.6 in the equation relatingη 0 to $$\bar M_w$$ was found for linear samples; this high value is probably due to the high content of cyclic oligomers in low molecular weight samples. Both linear and branched samples exhibited Newtonian behaviour over a rather wide range of shear rates, but for any given melt-viscosity, the branched samples became shear thinning at lower shear rates than the linear ones. Our experimental data were found to fit a previously proposed correlation between the melt viscosity ratio (η 0, b /η 0, 1 ) and a branching indexγ quite well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01331899
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  • 2
    Electronic Resource
    Electronic Resource
    Rheological characterization of highly branched poly(ethyleneterephthalate) (1989)
    Springer
    Rheologica acta 28 (1989), S. 25-29 
    Details
    ISSN: 1435-1528
    Keywords: Meltviscosity ; pseudoplasticpolyester ; linearpoly(ethyleneterephthalate) ; branchedpoly(ethyleneterephthalate) ; activation energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Linear and highly branched poly(ethyleneterephthalate) samples were synthesized and characterized in terms of intrinsic viscosity, molecular weight and melt viscosity over a wide range of shear rates at several temperatures, in the range from 265° to 295 °C. Linear samples exhibited Newtonian behavior over a wide range of shear rates, while the branched ones became shear thinning at relatively low shear rates. Our experimental data, as well as data previously reported, were found to be described by a proposed correlation between the melt viscosity ratio and a branching index. Moreover, the activation energy for melt flow was found for the highly branched samples to be a little higher than that of the linear samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01354765
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    Paper (German National Licenses)
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