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1CO2 UTILIZATION CO2ASAPOLYMERBUILDINGBLOCK Fig. 10: Synthesis routes to polymeric materials. have been numerous articles published on the subject. The copolymerisation is based on consecutive coordination and insertion steps. The structure of the catalyst plays a major role in the copolymerisation reac- tion and is the key to determining technical and commercial viability. Ther- modynamically favoured side reactions, such as the formation of polyethers by homopolymerisation of the oxiranes or the formation of cyclic carbonates via a backbiting reaction have to be suppressed. Both homogeneous and heterogeneous metalorganic compounds are used as catalysts. Compounds that are active for polymerisation include zinc, aluminium and chromi- um complexes, but also insoluble zinc compounds, such as those that form when diethyl zinc reacts with water, alcohols, phenols or carboxylic acids. In this project the goal is to use CO2 as a synthetic building block in the for- mation of polymeric materials. Custom-designed metalorganic catalysts will be used to provide resource-friendly and energy-efficient syntheses of polymers via the reaction of carbon dioxide with the reactive C3 building block propylene oxide. The resulting polycarbonates and polyurethanes are important starting materials for engineering materials, polymer films and foams. The polymeric materials produced in the project will be analysed in detail to determine their properties and optimised to enable their use in novel applications. Another project goal is to adjust the service temperature of the polymer material within certain limits by inserting additional termo- nomers or, alternatively, by including suitable fillers or blending compo- nents. New concepts for controlling molecular weight will be exploited to enable the direct production of oligomeric polycarbonate building blocks 38PDF Image | Chemical Processes and Use of CO2
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