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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