Supersonic Air-flow Method Of Low Temperature Solid Phase Synthesis Skeleton Polymers And Mechanism Research

Solid phase reaction,as an important part of green chemistry,has been widely attention.Mechanical chemical reaction has been more and more attention in chemical synthesis.In general,mechanochemical synthesis is realized according to mechanical ball milling,hand grinding,twin screw extrusion and microwave.However,these methods suffer from many drawbacks,for example,low response energy,high economic cost,long reaction time,difficult to realize large-scale industrial production and so on.Therefore,development of novel mechanochemical synthesis methods is highly desirable.Supersonic air-flow method of low temperature solid phase synthesis is proposed as a new method of solid phase synthesis,which make full use of fluid mechanics and dynamic reaction principle.The technology of supersonic air-flow acceleration and collision can achieve low heat solid phase reaction systhesis system energy transfer,and open a new route for solid synthetic.This method exhibits various advantages,such as batch preparation,simple operation,short time,low energy consumption,safe and environment-friendly,large-scale industrial production and so on.In this paper,the main contents of this paper include the improvement of supersonic solid-state solid-state reaction device,the using of supersonic gas flow method at low temperature solid-phase synthesis of different skeleton-based polymers.Exploring the supersonic air-flow solid-state synthesis can adapt to the reaction system.At the same time,the influence of different experimental conditions on the synthesis was studied.The mathematical model of the solid state reaction of supersonic airflow was established.(1)In the course of the experiment,it is found that the supersonic airflow low temperature solid-state reaction device exist deficient.Meanwhile many improvement schemes are put forward to improve the device,and to improve the energy utilization rate and the reaction rate to meet the more solid-phase reaction synthesis in the supersonic airflow low temperature solid phase device.(2)Two styles of metal organic frameworks,polyimide and poly 2,5-dimethoxy aniline polymer were successfully synthesis through supersonic air-flow method of low temperature solid phase synthesis.The as-preparedproducts were characterized by Fourier transform infrared(FT-IR)spectroscopy,powder X-ray diffraction(XRD),differential thermal analysis(DTA),scanning electron microscopy(SEM),ultraviolet-visible(UV-vis)spectroscopy,thermal analysis(TG-DSC)and cyclic voltammetry(CV).All the results indicates that those products were successfully synthesized and rational application.(3)In order to investigate the reaction mechanism of the device,the effects of different pressures,reaction time and particle size on the synthesis reaction were studied.The reaction process was monitored by non-in situ powder X-ray diffraction.The results were transformed into the conversion rate(?).Screening out the best dynamic model explore the mechanism of the reaction.