Hydrogenation of acrylonitrile-butadiene rubber latex using in situ synthesized RhCl(PPh3)3 catalyst

Preparation of hydrogenated natural rubber with nanomatrix structure

“…In the spectrum, the signals at 6.5 to 7.2 ppm were assigned to aryl protons in styrene unit . The proton signals of methylene and methine group of both acrylonitrile and styrene unit appeared in the range of 2.2 to 2.7 ppm whose intensities were associated to the feed of acrylonitrile and styrene as the monomers . Thus, mole fraction of acrylonitrile and styrene unit in the resulting materials was estimated from a ratio of signal intensities in the range of 2.2 to 2.7 ppm to the intensities of signals at 1.7 ppm and 0.8 ppm, as follows: where I 2.2−2.7 is the intensity of signals in the range of 2.2 to 2.7 ppm and I 0.8 and I 1.7 are the intensities of the signals at 0.8 and 1.7 ppm, respectively.…”

“…28 The proton signals of methylene and methine group of both acrylonitrile and styrene unit appeared in the range of 2.2 to 2.7 ppm whose intensities were associated to the feed of acrylonitrile and styrene as the monomers. 29 In the present work, acrylonitrile and styrene werrre graft-copolymerized onto various HDPNR specimens with different hydrogenation conversion. After the removal of free polystyrene, polyacrylonitrile, and styrene-co-acrylonitrile copolymer through acetone extraction, the SAN grafted onto HDPNR remained.…”

Synthesis of Pd/SiO2 Catalysts in Various HCl Concentrations for Selective NBR Hydrogenation: Effects of H+ and Cl– Concentrations and Electrostatic Interactions

“…Nowadays, the main process for the production of HNBR in industry is solution hydrogenation, including homogenous and heterogeneous hydrogenation. 9 In a homogeneous system, the reaction occurs at milder operation conditions and without any diffusion problems, 10−15 however, the removal of noble catalysts from HNBR is quite difficult and the residual catalysts in HNBR can accelerate its aging and degradation. 16,17 Compared with the homogeneous method, the heterogeneous system has received high attention as an alternative in the past few decades due to its facile catalyst recovery and recyclability, and the heterogeneous hydrogenation of NBR to HNBR has a great value both in research and in reality.…”

Hydrogenation of acrylonitrile–butadiene copolymer latex using water-soluble rhodium catalysts

“…To be on the safe side, all of the runs were carried out at 1000 rpm. The diffusion of the catalyst inside the NBR particles could be negligible since the size of NBR particles is very small (B70 nm, measured by dynamic light scattering 31 ). In our experiment, the catalyst was still pre-mixed with the NBR latex at the reaction temperature before adding H 2 gas to the system.…”