Issue 23, 2015
From the journal:

Polymer Chemistry

Chemically crosslinked yet reprocessable epoxidized natural rubber via thermo-activated disulfide rearrangements†

L. Imbernon,a   E. K. Oikonomou,a   S. Norvez*a  and  L. Leiblera  

* Corresponding authors

a Matière Molle et Chimie, ESPCI ParisTech – CNRS, UMR-7167, PSL Research University, 10 rue Vauquelin, 75005 Paris, France
E-mail: sophie.norvez@espci.fr

Abstract

The thermo-activated reprocessing ability of a chemically crosslinked epoxidized natural rubber (ENR) is investigated. Disulfide groups are introduced into the rubber using dithiodibutyric acid (DTDB) as a crosslinker. DTDB-cured ENR presents strong elastomeric properties due to the high molecular weight of the rubber and efficient crosslinking. The material behaves like a standard natural rubber until 100 °C and becomes reprocessable above 150 °C, owing to disulfide rearrangements. After grinding to a fine powder, the crosslinked rubber can be reprocessed and recovers most of its initial mechanical properties. The heat-triggered disulfide rearrangements are characterized in terms of stress relaxation, creep/recovery, adhesion tests, and swelling experiments. Comparison is made with ENR samples crosslinked by permanent links.

Graphical abstract: Chemically crosslinked yet reprocessable epoxidized natural rubber via thermo-activated disulfide rearrangements

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Article information

DOI
https://doi.org/10.1039/C5PY00459D
Article type
Paper
Submitted
27 Mar 2015
Accepted
30 Apr 2015
First published
30 Apr 2015

Polym. Chem., 2015,6, 4271-4278

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Chemically crosslinked yet reprocessable epoxidized natural rubber via thermo-activated disulfide rearrangements

L. Imbernon, E. K. Oikonomou, S. Norvez and L. Leibler, Polym. Chem., 2015, 6, 4271 DOI: 10.1039/C5PY00459D

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