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

作者：Zhou, Wei; Qu, Wenwen^*; Peng, Xiaohong^*

来源：Colloid and Polymer Science, 2021, 299(10): 1587-1593.

DOI：10.1007/s00396-021-04862-1

• Rhodium ion
• Benzoyl-terminated dendrimer
• Diene copolymers

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).