Abstract
EPDM rubber swollen in n-butylacetate was crosslinked with S 2Cl 2 solution in n-butylacetate. From swelling measurements in benzene and the Flory-Rehner equation, the density of elastically-active network chains was calculated as a function of time. Kinetics have been discussed; the diffusion process of S 2Cl 2 in the swollen polymer plays a very important role. Crosslinking of EPDM grafted with polyacrylic acid has been carried out on thin films using S 2Cl 2 as reagent and n-butylacetate as swelling agent, showing similar kinetic behaviour. Intermolecular bonds are due both to sulphur bridges in EPDM and to sulphur and to hydrogen bonds in EPDM grafted samples.
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