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M. Zaborski, L. Ślusarski, A. Vidal


Modification of surface of silica and its activity in ethylene-propylene rubber


Polimery 1993, No 6, 263


DOI: dx.doi.org/10.14314/polimery.1993.263

Summary

The previous experiments on silica hydrophobization to improve its activity as a filler for elastomers did not give satisfactory results and the reason of failure was not fully understood. It follows from our studies that substitution of the silanol groups on silica with rests of aliphatic alkohol reduces its surface energy у, and in particular its polar component y%, thus also the interfacial tension Y22, in comparison with ethylene-propylene rubber and other nonpolar rubbers. However, blocking of silanol groups on the surface of particles reduces the ability of silica to form its own space lattice (the so-called "structure") in the polymeric dispersion medium; this fact contributes even more to filler activity than the decrease in Y12 value. On the other hand, activity of silica as a filler increases when an elastomer is grafted onto it. This can be achieved by modifying silica with allyl alcohol or with silanes containing unsaturated (vinyl or methacryloyl) groups and by initiating reaction with an elastomer using a peroxide.


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