Abstract
A low‐molecular‐weight trans‐1,4‐polyisoprene (LMTPI) was synthesized with hydrogen as a molecular weight regulator. The effect of hydrogen pressure on the molecular weight of TPI was investigated. Increasing the H2 pressure effectively reduced the molecular weight of TPI. When LMTPI was used as plasticizer in styrene‐butadiene rubber (SBR), the scorch time and optimum‐curing time of the SBR compounds increased compared with that of SBR compounds containing aromatic oil. The rebound resilience and anti‐fatigue of SBR vulcanizates were improved. The effect of pelletized sulfur (LMTPI as carrier) on the mechanical properties of natural rubber (NR) vulcanizates was studied and compared with that of powder sulfur and a commercial pelletized sulfur (Rhenogran S‐80). The pelletized sulfur could improve the processing properties of the NR compound. It also could effectively improve the flexing resistance and retain good mechanical properties of NR vulcanizates.
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