Hydrogenated styrene–isoprene–butadiene rubber: optimisation of hydrogenation conditions and performance evaluation as viscosity index improver

Abstract

Hydrogenated styrene-isoprene-butadiene rubber (HSIBR) was prepared through the hydrogenation reaction of self-prepared styrene-isoprene-butadiene rubber using a Ziegler-Natta type catalyst prepared with nickel naphthenate (Ni) and aluminum triisobutyl (Al). The precursors and corresponding hydrogenated polymers were characterised using size exclusion chromatography, proton nuclear magnetic resonance ( 1 H NMR) spectroscopy, differential scanning calorimetry and thermal gravimetric analysis. The effects of various reaction parameters on the level of hydrogenation, calculated from 1 H NMR spectroscopy, were investigated in the current paper. A maximum of 98% hydrogenation was obtained under the following conditions: Al/Ni molar ratio, 6; catalyst amount, 3 mg Ni per g of polymer; time, 3 h; temperature, 60°C; H 2 pressure, 4 MPa and polymer concentration, 10 wt.%. Moreover, a different SAE 5W-30 multigrade oil (5 CST hydroisomerisation dewax base oil) was formulated using HSIBR samples as viscosity index improvers (VII). The effect of butadiene/isoprene mass ratio in HSIBR on the performance of VII for lubricants was investigated here for the first time. HSIBR used as VII for lubricants integrated some advantages of hydrogenated styrene-butadiene rubber and hydrogenated styrene-isoprene rubber.

Studies of the Sulfonated Hydrogenated Styrene–Isoprene–Styrene Block Copolymer and Its Surface Properties, Cytotoxicity, and Platelet-Contacting Characteristics

“…SIS copolymers were hydrogenated according to previous procedures [ 21 , 22 , 23 , 24 ] with some modifications. The hydrogenation process was conducted under an argon atmosphere, and all Schlenk flasks were filled with argon after high-temperature heating.…”

Sulfonation and Characterization of Tert-Butyl Styrene/Styrene/Isoprene Copolymer and Polypropylene Blends for Blood Compatibility Applications

“…The reaction scheme is shown in Figure 2. Following the previous studies [17][18][19][20][21], cyclohexane and 0.71 mL (1.34 mmol) cobalt (II) 2-ethyl hexanoate solution were purged with argon in a 100 mL flask for 30 min. Then, 4.8 mL (4.8 mmol) of triethyl-aluminum was added and the reaction was carried out under room temperature for 60 min.…”