Next Article in Journal
A Water Balloon as an Innovative Energy Storage Medium
Next Article in Special Issue
Nanofluids of Amphiphilic Kaolinite-Based Janus Nanosheets for Enhanced Oil Recovery: The Importance of Stable Emulsion
Previous Article in Journal
Effect of Silane Coupling Agents on the Rheology, Dynamic and Mechanical Properties of Ethylene Propylene Diene Rubber/Calcium Carbonate Composites
 
 
Font Type:
Arial Georgia Verdana
Font Size:
Aa Aa Aa
Line Spacing:
Column Width:
Background:
Article

Time/Molecular Weight Superposition to Describe the Behavior of Controlled-Rheology Polypropylenes

1
Fractionnement des Agro-Rsources et Environnement, University of Reims Champagne Ardenne, INRAE, 51100 Reims, France
2
CEMEF, UMR CNRS 7635, Mines Paris—PSL, CS 10207, 06904 Sophia-Antipolis, France
*
Author to whom correspondence should be addressed.
Polymers 2022, 14(16), 3398; https://doi.org/10.3390/polym14163398
Submission received: 1 August 2022 / Revised: 12 August 2022 / Accepted: 17 August 2022 / Published: 19 August 2022
(This article belongs to the Special Issue Polymer/Particle Composites: New Advances and Applications)

Abstract

Polypropylene resins issuing from polymerization reactors are degraded by peroxides in subsequent reactive extrusion processes to improve their processability. This operation reduces their molecular weight and, thus, their viscosity and elasticity. In a previous study, a series of homo- and copolymer polypropylenes of different molecular weight distributions were prepared by twin-screw extrusion and characterized by oscillatory rheometry. It was shown that their behavior could be described by Carreau–Yasuda equations, possibly with a yield stress, in which all parameters depended on the weight average molecular weight. By using these experimental data, it is show in the present study that a time/molecular weight superposition allowed for a drastic reduction in the number of parameters to be considered in order to precisely describe the viscous behavior of these materials. This concept was then validated by applying it to various experimental data from the bibliography.
Keywords: polypropylene; peroxide; molecular weight; viscosity; mastercurve polypropylene; peroxide; molecular weight; viscosity; mastercurve

Share and Cite

MDPI and ACS Style

Berzin, F.; Vergnes, B. Time/Molecular Weight Superposition to Describe the Behavior of Controlled-Rheology Polypropylenes. Polymers 2022, 14, 3398. https://doi.org/10.3390/polym14163398

AMA Style

Berzin F, Vergnes B. Time/Molecular Weight Superposition to Describe the Behavior of Controlled-Rheology Polypropylenes. Polymers. 2022; 14(16):3398. https://doi.org/10.3390/polym14163398

Chicago/Turabian Style

Berzin, Françoise, and Bruno Vergnes. 2022. "Time/Molecular Weight Superposition to Describe the Behavior of Controlled-Rheology Polypropylenes" Polymers 14, no. 16: 3398. https://doi.org/10.3390/polym14163398

APA Style

Berzin, F., & Vergnes, B. (2022). Time/Molecular Weight Superposition to Describe the Behavior of Controlled-Rheology Polypropylenes. Polymers, 14(16), 3398. https://doi.org/10.3390/polym14163398

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

Article Metrics

Back to TopTop