Next Article in Journal
Tuning the Mechanical Properties of Polymer Nanocomposites Filled with Grafted Nanoparticles by Varying the Grafted Chain Length and Flexibility
Next Article in Special Issue
Dilute Semiflexible Polymers with Attraction: Collapse, Folding and Aggregation
Previous Article in Journal
Hedgehog Buckyball: A High-Symmetry Complete Polyhedral Oligomeric Silsesquioxane (POSS)
Previous Article in Special Issue
Conformational Properties of Active Semiflexible Polymers
Article Menu
Issue 9 (September) cover image

Export Article

Open AccessArticle
Polymers 2016, 8(9), 317; doi:10.3390/polym8090317

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

Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 275, 760 01 Zlin, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Martin Kröger
Received: 27 June 2016 / Revised: 9 August 2016 / Accepted: 15 August 2016 / Published: 24 August 2016
(This article belongs to the Special Issue Semiflexible Polymers)
View Full-Text   |   Download PDF [6528 KB, uploaded 24 August 2016]   |  

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. View Full-Text
Keywords: branched polypropylene; thermal degradation; uniaxial extensional viscosity; polymer melts; constitutive equations branched polypropylene; thermal degradation; uniaxial extensional viscosity; polymer melts; constitutive equations
Figures

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Drabek, J.; Zatloukal, M. Evaluation of Thermally Induced Degradation of Branched Polypropylene by Using Rheology and Different Constitutive Equations. Polymers 2016, 8, 317.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Polymers EISSN 2073-4360 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top