Ultra-fast Supercritically-solvothermal Polymerization for Large-sized Covalent Organic Framework Single Crystals
The properties and applications of crystalline polymer materials largely depend on their crystallinity.Rapid preparation of high crystalline or single crystal polymer materials is not only beneficial for studying their structure-property relationship,but can also expand their practical applications.However,efficiently and accurately assembling organic molecules into polymer single crystals through polymerization is a challenging task.To address this issue,our group has developed a supercritically-solvothermal method for achieving ultra-fast preparation of polymer single crystals.This method uses supercritical carbon dioxide as the reaction medium,which greatly improves the growth rate of polymer crystals due to its high diffusion rate and low viscosity.This feature article reviews the commonly used synthesis methods for covalent organic frameworks(COFs),as well as the challenges faced in single crystal preparation.Then,the basic properties and applications of supercritical fluids,the advantages of supercritically-solvothermal method,and the structural characterization of the prepared COF single crystals are systematically discussed.Finally,the challenges and development directions faced in the synthesis of polymer single crystals by supercritically-solvothermal method are prospected.
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