Homogeneous rhodium ion catalyst encapsulated by benzoyl-terminated dendrimer: high hydrogenation and separation capabilities for diene copolymers

摘要

Benzoyl chloride has been employed to react with primary amino groups on the surface of the second generation of poly(propylene imine) (G2-PPI) dendrimer to synthesize benzoyl-terminated dendrimer (G2-B) by a nucleophilic substitution reaction. A novel homogeneous catalyst of G2-B(Rh3+) has been prepared by complexing RhCl3 center dot 3H(2)O with G2-B, and further applied to the catalytic hydrogenation of nitrile butadiene rubber (NBR) and styrene butadiene rubber (SBR). The hydrogenation degrees (HDs) of HNBR and HSBR catalyzed by G2-B(Rh3+) are 99.2 and 92.1% respectively. The contents of Rh residue in the HNBR and HSBR catalyzed by G2-B(Rh3+) are only 41 and 31 ppm, respectively, which are respectively decreased by 84.5 wt% and 83.2 wt%, respectively, compared to those catalyzed by RhCl(PPh3)(3).

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