Application Exploration Of Aluminum Grignard Reagents In Non-Organic Synthesis Fields

Aluminum Grignard reagents have high reactivity,and the higher Lewis acidity and lower toxicity of the central metal aluminum are excellent nucleophiles in organic reactions.It is commonly used in the field of organic synthesis and is rarely used in other fields.In this paper,the thermal decomposition characteristics of aluminum Grignard reagents were used to explore the application of graphene electroless aluminum plating.In the process,it was found that the prepared aluminum Grignard reagent has high activity and the aluminum powder remaining after the reaction also has high activity?reducibility?.According to this discovery,the reductive dechlorination effect of aluminum Grignard reagent on PVC plastics was also explored through experiments.The thermal decomposition characteristics of aluminum Grignard reagents were used to explore its application in graphene electroless aluminum plating.Aluminum Grignard reagent sesquiethyl aluminum bromide was prepared by using aluminum powder and EtBr as raw materials.The influence of the initiation temperature on the initiation time and the reaction time on the activity of the aluminum Grignard reagent were investigated.It is found that the initiation time became shorter as the initiation temperature increased,and when the temperature is higher than the boiling point of EtBr?38.4°C?,the initiation time does not change with the increase of the temperature.With the prolongation of the reaction time,the activity of the aluminum Grignard reagent gradually became higher.When the reaction time exceeded a certain value?t?80 min?,the activity was high and the difference was not significant.The effects of reaction temperature and NaH addition on the graphene electroless aluminum plating were investigated.It is found that the aluminum Grignard reagent does not decompose to produce aluminum in the lower temperature,and the aluminum Grignard reagent can be completely decomposed only when the temperature reaches a certain upper limit?T?130°C?.Under the premise of a reaction temperature of 130°C,the amount of NaH added is too small,and the aluminum element itself will agglomerate and cannot be adsorbed and deposited on graphene.The amount of NaH added is too large,and the aluminum element can be adsorbed and deposited on the graphene,and then agglomerates as a whole.According to theoretical simulation,whether aluminum can be adsorbed and deposited on graphene is related to the change rate of surface tension of solution.The reduction of surface tension can facilitate the adsorption process,and the addition of NaH can indirectly reduce the surface tension of the solution.When the amount of the substance of NaH is slightly larger than EtBr,the produced aluminum element can uniformly disperse on the graphene without agglomeration.Nitrogen adsorption results,Raman spectroscopy and SEM images show that the interaction between graphene and aluminum after aluminum plating causes the graphene to bend to form a cladding structure,and the distance between the graphene layers becomes larger.XRD analysis showed that there was no Al₄C₃ brittle phase in the sample,and the adsorption of aluminum on graphene was a weak interaction between molecules.The strong reduction of aluminum Grignard reagents was used to explore the application of PVC reduction degradation.The reduction and degradation effects of bromoethane and CCl₄and their mixtures as activated solvents on PVC were compared.It was found that the final product of PVC degradation had the lowest chlorine content when CCl₄ was used as the activation solvent for the reaction,and the by-product AlCl₃ produced was of high purity and did not contain AlBr₃.The effect of temperature on the reduction and dechlorination of PVC was investigated.It was found that the chlorine removal rate increased first and then decreased with the increase of temperature.When the reaction temperature is 60°C,the chlorine removal rate is up to 99.75%,and the initiation time is short.By observing the phenomenon of exhaust gas absorption,it can be found that the gas generated by the reaction is a small molecule olefin and HCl.Infrared spectroscopy and X-ray diffraction analysis indicated that the final product after degradation was a small molecule organic containing-OH and C=C?non-conjugated double bonds?.The method achieves the same dechlorination effect as the first stage of PVC pyrolysis,and the reaction temperature is greatly reduced.In addition,the activated solvent CCl₄ and detergent anhydrous ethanol can be recycled,indicating that the method is relatively economical and environmentally friendly.