ISSN:
1435-1528
Keywords:
Poly(butyleneterephthalate)
;
branched poly(butyleneterephthalate)
;
pseudoplastic polyester
;
melt viscosity
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Abstract Linear and branched PBTP samples were synthesized and characterized in terms of the intrinsic viscosity, the melt-flow-index and, for some, the melt viscosity over a range of shear rates at 250 °C. An exponent of 3.2 in the equation relatingη to $$\bar M_w $$ was found for linear samples. Both linear and branched samples exhibited Newtonian behaviour over a 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. Correlation between a branching index,γ, and melt-visocity ratio (η0,b/η0,l) was in agreement with a previous theoretical study.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01333871
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