Construction Of Organosilicon Polymer Based On PH Indicator And Its Adsorption Application

Due to the existence of silicon atoms in the structure of organosilicon material,it possesses unique properties and has been widely used in many fields such as aerospace,electronics,electricity,machinery,construction and has become an indispensable material in national life.Organic silicon materials have rapidly developed in recent years,compared with various organic carbon materials,there are fewer types of organic silicon materials,so the development of new type silicon functional materials is necessary.The recently developed organic porous polymers have received extensive attention due to their excellent pore properties,light weight,diversified synthesis,thermal and chemical stability of the organic framework and widely application fields.Compared with organic carbon porous materials,organic silicon porous materials have the advantages of easy monomer synthesis and high specific surface area,but the construction of organic silicon porous materials with organic silicon monomers are only in preliminary stage.Therefore,the main work of this thesis is the design and synthesis of four kinds of microporous polymer materials with silicon as the core.The structure and properties of these materials are characterized by solid state NMR,nitrogen isothermal adsorption and desorption methods and the adsorption capacity of these materials for carbon dioxide and other gases have been preliminarily studied.Specific research contents are as follows:pH indicator are prepared and characterized by infrared,nuclear magnetic and other methods.Then,the porous polymer organosilicate material is prepared based on the two monomers and the performance is studied.We have combined the advantages of D₄H and pH indicator to prepare four kinds of porous organosilicone polymers POP-1?POP-4 by PR reaction,using D₄H and bromophenol blue,bromophenol red,bromophenol purple and bromophenol green as building monomers.Compared with other porous polymers,the obtained materials have great thermal stability.Materials have a moderate carbon dioxide storage capacity and show moderate gas adsorption capacity:the CO₂adsorption capacities of POP-1 at 273 K/1.0 bar and 298 K/1.0bar are(8.08 wt%)and 1.64 mmol/g(7.21 wt%);respectively,the CO₂adsorption capacity of POP-2 at 273 K/1.0 bar and 298 K/1.0 bar are 6.02 mmol/g(26.47 wt%)and 4.34mmol/g(19.09 wt%);the CO₂adsorption capacity of POP-3 at 273 K/1.0 bar and 298 K/1.0bar are 6.42 mmol/g(28.24 wt%)and 4.82 mmol/g(21.21 wt%);the CO₂adsorption capacity of POP-4 at 273 K/1.0 bar and 298 K/1.0 bar is 1.06 mmol/g 2.52 mmol/g(11.09 wt%)and1.78 mmol/g(7.83 wt%),respectively.These results indicate that the obtained materials can be used as a potential adsorption material for storing and capturing carbon dioxide.