NDLI: Time-resolved rheometry of poly(ethylene terephthalate) during thermal and thermo-oxidative degradation

Content Provider	Springer Nature Link
Author	Kruse, Matthias Wagner, Manfred H.
Copyright Year	2016
Abstract	Time-resolved rheometry was employed to study thermal and thermo-oxidative degradation of poly(ethylene terephthalate) (PET). Degradation results in a vertical downward shift of the complex viscosity in air atmosphere. We conclude that reduction of moduli and viscosity is governed by oligomers emerging from chain scission and acting as plasticizer. Additionally, cross-linking leading to a yield stress is observed at long times. In nitrogen atmosphere, polycondensation increases the molar mass and viscosity and extends the shear thinning regime. With longer degradation times, thermal degradation prevails and leads to a vertical downward shift. The reaction kinetics of three PETs with different molar mass was analyzed by a time constant τ assuming first-order kinetics. The low molecular weight PET exhibits the largest time constant in air atmosphere, and hence the lowest degradation rate, while high molecular weight PET exhibits a small τ and rapid degradation. The enhancement rate in nitrogen is vice versa.
Starting Page	789
Ending Page	800
Page Count	12
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	55
Issue Number	10
e-ISSN	14351528
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-08-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Time-resolved rheometry Linear viscoelasticity Yield stress Rheology Degradation Cox-Merz rule Characterization and Evaluation of Materials Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Mechanical Engineering Food Science
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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