Affiliation:
1. Stevens Institute of Technology Castle Point, NJ 07030
2. Dept. of Civil Engineering Warsaw Technical University
01-793 Warsaw, Poland
Abstract
The rate and temperature dependence of the extrudate swelling func tion, approximated by the least squares logarithmic parabola equation, was evaluated for five branched low density polyethylenes (LDPE) which differed significantly in processability. Assigning rheological significance to the parameters of the approxima tion equation, an explicit measure of processability of LDPE into film was demon strated in the form of the Universal Swelling Coefficient, A ∞ The derived character istic relaxation times for shear and elongation flows (τ12 and τ 11 , respectively) were subsequently employed in estimating the Deborah (De) and Brinkman (Br) criterial numbers, which are useful in designing the extrusion film blowing process on the basis of the LDPE melt elasticity function.
Subject
Materials Chemistry,Polymers and Plastics,Surfaces, Coatings and Films
Reference36 articles.
1. Clegg, P.L. "Elastic Effects in the Extrusion of Polythenes", in The Rheology of Elastomers, London, p 174 (1958)
2. Evaluation of melt flow as a measure of low density polyethylene processability into blown films
3. The die swell phenomenon
Cited by
2 articles.
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