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Abstract
Abstract The study was focused on the investigation of trans-polyoctylene (TOR) influence on cross-linking as well as mechanical and rheological properties of rubber compounds based on styrene-butadiene rubber (SBR). SBR was compounded with different proportions of TOR in the concentration range from 0 to 30 phr. Integration of TOR into rubber leads to the prolongation of the optimum curing time and scorch time and thus the decrease of the curing rate. Higher content of TOR led to less viscous rubber due to the plasticizing effect. Cross-link density of vulcanizates was reduced, which correlates with higher elongation at break. Tensile strength and hardness of vulcanizates increased with the increasing TOR content, probably due to the increasing amount of the crystalline phase.
Highlights
Styrene-butadiene rubber is the most widely used and very important synthetic rubber worldwide
Optimum curing time, t90, and scorch time, ts1, were prolonged with the increasing content of trans-polyoctene rubber (TOR), which suggests that TOR influences the cross-linking process of rubber compounds
TOR contains a double bond at every eighth carbon atom, which is why the curing rate was lower in comparison with unmodified styrene-butadiene rubber (SBR) blends
Summary
Styrene-butadiene rubber is the most widely used and very important synthetic rubber worldwide. TOR is a semicrystalline rubber known as a compatibilizer for incompatible blends as well as a processing aid It can provide good processability in the temperature range of rubber processing (100—150 °C) as well as good collapse resistance below the melting temperature (54 °C) due to recrystallization (Awang et al, 2007; Evonik website, 2019). It is a high-performance polymer with dual character. Blends play the role of plasticizers and in process of vulcanization they react as unsaturated rubber Due to this dual character, processing of natural rubber/styrene-butadiene rubber blend is improved in terms of energy savings and handling of intermediary compounds and the vulcanization profile is changed. TOR as unsaturated rubber can enable cross-linking with sulfur, sulfur donors, peroxides or cure resins (Pana at al., 2008; Nah, 2002; Noriman et al, 2012; Chang et al, 1999)
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