Kinetics of cross-linking and de-cross-linking of EPM rubber with thermoreversible Diels-Alder chemistry

L. M. Polgar, A. Kingma, M. Roelfs, M. van Essen, M. van Duin, F. Picchioni

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

10 Citaten (Scopus)
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Samenvatting

The kinetics of the Diels-Alder (DA) cross-linking and retro-Diels-Alder (rDA) de-cross-linking reactions have been studied for furan-containing EPM rubber thermoversibly cross-linked with a bismaleimide. Cross-linking conversions obtained from spectroscopic methods deviate from rheological methods as the former take into consideration both the intermediate DA adduct and complete cross-links, while the latter only determine the formation and decomposition of complete cross-links. The thermoreversibility of the system was shown by a combination of equilibrium swelling and rheological measurements. Dynamic time sweeps of the rubber at different temperatures were used to determine the Arrhenius activation energies of 7.04 and 57.9 kJ/mol for the DA and the rDA reactions, respectively. Ea,DAis relatively low and suggests a diffusion limitation while Ea,rDAcorrespond to values reported in literature. Both values were used to simulate cross-link density profiles as a function of time and temperature that correspond well with the experimental data.

Originele taal-2Engels
Pagina's (van-tot)150-161
Aantal pagina's12
TijdschriftEuropean Polymer Journal
Volume90
DOI's
StatusGepubliceerd - 1 mei 2017

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