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T. Pingot, M. Pingot, M. Zaborski

Crosslinking of styrene butadiene rubber with redox systems at low temperatures

Polimery 2010, No 11-12, 825


DOI: dx.doi.org/10.14314/polimery.2010.825

Summary

The possibilities of crosslinking styrene butadiene rubber (SBR) at low temperatures with a series of redox systems made up of different types of reducing and oxidizing agents have been explored (Table 1). Transition metal salts were used as reducing agents. A pronounced decrease in the activation energy of the crosslinking process (Fig. 1) was achieved by adopting this method, therefore the crosslinking reaction could be performed at temperatures as low as 80 °C. The influence of the composition of the redox system on rheometrical properties (Table 2), the crosslinking process (Figs. 2 and 3), crosslinking density (Figs. 4—6, Table 3) as well as on mechanical properties was determined. Moreover, the ageing process of unfilled and filled vulcanizates with silicates under UV irradiation was evaluated (Table 4, Figs. 7 and 8). The possibility of crosslinking SBR at low temperatures with the application of systems containing cumene hydroperoxide, in which the reducing agent had been replaced by an ammonium salt — tetrabutylammonium bromide (TBAB) or tetraoctylammonium bromide (TOAB) was also explored.


Keywords: redox systems, styrene-butadiene rubber, crosslinking, kinetics, process temperature, vulcanizates, application properties, ageing


e-mail: tomasz.pingot@p.lodz.pl


T. Pingot, M. Pingot, M. Zaborski

Crosslinking of styrene butadiene rubber with redox systems at low temperatures