Influence of the chemical structure of cross-linking agents on properties of thermally reversible networks

Lorenzo Massimo Polgar, Robin R. J. Cerpentier, Gijs H. Vermeij, Francesco Picchioni*, Martin van Duin

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

8 Citaten (Scopus)
18 Downloads (Pure)

Samenvatting

It is well-known that the properties of cross-linked rubbers are strongly affected by the cross-link density. In this work it is shown that for thermoreversibly cross-linked elastomers, the type and length of the cross-linker also have a significant effect. A homologous series of diamine and bismaleimide cross-linkers was used to cross-link maleic-anhydride-grafted EPM irreversibly and furan-modified EPM thermoreversibly, respectively. Bismaleimide cross-linkers with a polarity close to that of EPM and a relatively low melting point have a better solubility in the rubber matrix, which results in higher chemical conversion and, thus, higher cross-link densities at the same molar amount of cross-linker. Samples cross-linked with different spacers (aromatic and aliphatic spacers of different lengths) were compared at the same cross-link density to interpret the effects on the material properties. The rigid character of the short aliphatic and the aromatic cross-linkers accounts for the observed increase in hardness, Young's modulus and tensile strength with respect to the longer, more flexible aliphatic cross-linkers. In conclusion, the structure of the cross-linking agent can be considered as an alternative variable in tuning the rubber properties, especially for thermoreversibly crosslinked rubber.

Originele taal-2English
Pagina's (van-tot)1103-1116
Aantal pagina's14
TijdschriftPure and Applied Chemistry
Volume88
Nummer van het tijdschrift12
DOI's
StatusPublished - dec-2016

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