Rheological evaluation of melt blown polymer melt

Drábek, Jiří; Zatloukal, Martin

doi:10.1063/1.4802618

Cited by 3 publications

(1 citation statement)

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“…For the pure shear flow, the function f ( I |D| , II D , III D ) becomes equal to 1 and thus, the viscosity becomes a function of second invariant of deformation rate tensor D (IID=sans-serifγ˙2) only. In the pure uniaxial extensional flow, where I|D|= 2trueε˙, IID=3sans-serifε˙2, and IIID=sans-serifε˙3/4, the function f ( I |D| , II D , III D ) becomes nonzero and model becomes capable of representing steady-state extensional flows for different polymer melts [69,70,71,72,73,74].…”

Section: Theoreticalmentioning

confidence: 99%

Evaluation of Thermally Induced Degradation of Branched Polypropylene by Using Rheology and Different Constitutive Equations

Drábek

Zatloukal

2016

Polymers

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Abstract:In this work, virgin as well as thermally degraded branched polypropylenes were investigated by using rotational and Sentmanat extensional rheometers, gel permeation chromatography and different constitutive equations. Based on the obtained experimental data and theoretical analysis, it has been found that even if both chain scission and branching takes place during thermal degradation of the tested polypropylene, the melt strength (quantified via the level of extensional strain hardening) can increase at short degradation times. It was found that constitutive equations such as Generalized Newtonian law, modified White-Metzner model, Yao and Extended Yao models have the capability to describe and interpret the measured steady-state rheological data of the virgin as well as thermally degraded branched polypropylenes. Specific attention has been paid to understanding molecular changes during thermal degradation of branched polypropylene by using physical parameters of utilized constitutive equations.

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