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M. Zaborski, L. Ślusarski



Activity of fillers in vulcanizates with unconoventional crosslinks


Polimery 1993, No 1, 26


DOI: dx.doi.org/10.14314/polimery.1993.026

Summary

At the Polymer Institute of the Technical University in Łódź a hypothesis was formulated that the reinforcing effect of fillers depends not only on the properties and structure of fillers themselves, but also on the type of medium in which they are dispersed. To verify this hypothesis the behaviour of fillers (N-550 carbon black, precipitated silica, ZnO and CaC03) in rubbers crosslinked conventionally or by means of substances forming ionic or complex crosslinks was studied. The object of studies was ethylene-propylene rubber (EPM) cured with dicumyl peroxide (DCP) only or with DCP in the presence of monoallyl maleate (MA). It was established that in the peroxide-cured vulcanizates there were present C-C crosslinks only, whereas addition of MA resulted in the formation of two types of crosslinks: covalent C-C crosslinks and cluster-like ionic crosslinks. It was shown that a stronger reinforcing effect had fillers in vulcanizates containing ionic crosslinks. This was particularly noticeable in the case of fillers with surface of basic character (CaCO3 and ZnO). Complex-type cross links were obtained by acting on butadiene-acrylonitrile rubber (NBR) with zinc chloride. It was established that ZnO activity is higher in ZnO-containing vulcanizates, whereas behaviour of SiO2 is less dependent on the structure of cross links, in spite of an effect of ZnCl2 on interactions between NBR and SiO2. The results confirm the validity of the above mentioned hypothesis.


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