4-poly(butadiene-co-isoprene) rubber (TBIR) was modified by environment-friendly aromatic oil (TDAE) with different weight fraction (0
5
10
15 phr) and the effects of extending oil on the TBIR rubbers
TBIR compounds and TBIR vulcanizates were studied in details.The results showed that with the increase in extending oil
the Mooney viscosity of the TBIR rubbers and TBIR compounds decreased
as well as improved extrusion appearance and weakened Payne effect of the oil extended TBIR compounds. The TBIR vulcanizates with 5~10phr oil presented outstanding 1st crack resistance (23 times higher) than that of the TBIR vulcanizate
as well as the reduced loss factor
increased tear strength
lower hardness and almost unchanged tensile strength and modulus. TEM test showed that the carbon black dispersion in the oil extended TBIR vulcanizates was improved. DSC measurement indicated the existence of crystalline domains in the TBIR vulcanizates. The TBIR vulcanizate with 10phr extending oil possessed the satisfied performances.