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Diels-Alder chemistry has been used for the thermoreversible cross-linking of furan-functionalized ethylene/propylene (EPM) and ethylene/vinyl acetate (EVM) rubbers. Both furan-functionalized elastomers were successfully cross-linked with bismaleimide to yield products with a similar cross-link density. NMR relaxometry and SAXS measurements both show that the apolar EPM- g -furan precursor contains phase-separated polar clusters and that cross-linking with polar bismaleimide occurs in these clusters. The heterogeneously cross-linked network of EPM- g -furan contrasts with the homogeneous network in the polar EVM- g -furan. The heterogeneous character of the cross-links in EPM- g -furan results in a relatively high Young's modulus, whereas the more uniform cross-linking in EVM- g -furan results in a higher tensile strength and elongation at break.

Effect of Rubber Polarity on Cluster Formation in Rubbers Cross-Linked with Diels–Alder Chemistry