Enhanced thermo-oxidative stability of polydicyclopentadiene containing covalently bound nitroxide groups

•Copolymerization of a TEMPO-derived norbornene and a dicylopentadiene industrial formulation.•Thermal ageing of thin films of this stabilized bulk PDCPD material.•Impact of thermal oxidation on mechanical behaviour of this formulation.•Comparison with an industrial BHT-stabilized PDCPD formulation....

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Bibliographic Details
Published in:Polymer degradation and stability 2022-01, Vol.195, p.109765, Article 109765
Main Authors: Nicolas, Clémence, Huang, Jing, Richaud, Emmanuel, David, Adelina, Gac, Pierre-Yves Le, Minne, Wendy, Drozdzak, Renata, Recher, Gilles, Fontaine, Laurent, Montembault, Véronique
Format: Article
Language:English
Subjects:
Antioxidants
Chemical bonds
Chemical Sciences
Copolymerization
Decay rate
Fourier transforms
Fracture testing
Infrared spectroscopy
Mechanical properties
Metathesis
Nitroxide radical-containing norbornene
Oxidation
Polydicyclopentadiene
Polymerization
Polymers
Ring opening
Ring-opening metathesis polymerization (ROMP)
Stability
Tensile tests
Thermo-oxidative ageing
Thin films
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Summary:•Copolymerization of a TEMPO-derived norbornene and a dicylopentadiene industrial formulation.•Thermal ageing of thin films of this stabilized bulk PDCPD material.•Impact of thermal oxidation on mechanical behaviour of this formulation.•Comparison with an industrial BHT-stabilized PDCPD formulation. The antioxidant 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) group was covalently introduced into polydicyclopentadiene (PDCPD) through ring-opening metathesis polymerization (ROMP) copolymerization of dicyclopentadiene (DCPD) with a TEMPO-derived norbornene comonomer. The thermal oxidation of the resulting thin films was monitored by ThermoGravimetric Analyses (TGA) and Fourier-Transform Infra-Red spectroscopy (FT-IR). This new PDCPD stabilized by immobilization of the TEMPO antioxidant shows a better thermo-oxidative stability at 60 °C under air than an industrial formulation of PDCPD stabilized with 2,6-di‑tert‑butyl‑4-methylphenol (BHT). Impact of thermal oxidation on mechanical behaviour of both formulations have been studied by tensile tests and fracture tests, based on the essential work of fracture (EWF) concept. The TEMPO-functionalized PDCPD offers a promising alternative to BHT-stabilized PDCPD with comparable ductility but slower decay and better cracking resistance, confirming the benefit of the TEMPO antioxidant in PDCPD formulation when chemically bound to the matrix.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2021.109765