The Synthesis Of New Salen (Co) Catalyst And Its Application In Carbon Dioxide Copolymer

In recent years, with the rapid development of industry, the rising emissions of carbon dioxide in the atmosphere year by year lead to the "greenhouse effect" which brought serious harm to the society. How to control and the effective utilization of carbon dioxide in the atmosphere got the extensive concern to the all world researchers. In this paper, we studied a kind of Salen type catalyst, which could catalyze the reaction of carbon dioxide with propylene oxide in order to obtain high molecular weight of polycarbonate. The main work was as followings:We synthesized the Salen-Co catalyst using 4-Hydroxyphenethyl alcohol as raw material, which was gotten by the reaction of formylation, chlorine substitution, iodine substitution and reacted with o-phenylendiamine to get the target product of bis-(5-iodo ethyl salicylaldehyde) o-phenylendiamine double Schiff base. The next step was that the Schiff base reacted with triethylamine, silver tetrafluoroborate respectively to get the quaternary ammonium salt. The last step was that the quaternary ammonium salt reacted with the cobalt perchlorate hexahydrate to get the target catalyst. Nuclear magnetic resonance (NMR) spectra and infrared (IR) absorption spectra were used to characterize and further confirm the structure of target products of each step.To explore the influence of temperature and pressure on the catalytic copolymerization reaction of carbon dioxide with propylene oxide by Salen-Co catalyst, we mixtured the Moore proportion of Salen-Co catalyst and propylene oxide with 1:25000 for copolymerization reaction. And we got the optimum copolymerization conditions of carbon dioxide with propylene oxide by changing the copolymerization temperature and pressure which the reaction pressure was 2.0 MPa, the reaction temperature was 30 ℃.We synthesized the bis-(5-iodo-ethyl-salicylaldehyde)o-4’-vinyl-3,4-diphenyl diamine double Schiff base using 4-Hydroxyphenethyl alcohol as raw material, which was gotten by the reaction of formylation, chlorine substitution, iodine substitution and then reacted with 4’-vinyl-3,4-diphenyl-diamine to got the target Schiff base. Nuclear magnetic resonance (NMR) spectra and infrared (IR) absorption spectra were used to characterize and further confirm the structure of target products of each step.