Cucurbit[6]uril Three Dimensional Network Polymer Constructed By Dynamic Covalent Bond

In recent decades,supramolecular chemistry has attracted extensive attention in chemistry,medicine,pharmacy,materials science and other fields.Cucurbituril,macrocyclic compound,contains a unique cavity and has the ability to recognize specific molecules and self-assembly.It has excellent application value in the field of material science and other fields.Meanwhile,the dynamic covalent bond formed under thermodynamic equilibrium is reversible,adjustable and controllable.However,this balance can be broken by physical or chemical stimuli,which indicates the stimulus response characteristics of dynamic covalent bonds.This special property has been widely used in various fields.In this paper,intelligent polymer materials were prepared by using cucurbit[6]uril derivative and dynamic covalent bond,and their properties were studied and characterized.It is mainly divided into the following parts:(1)A series of copolymers(PAM-CB[6]MA-MH)were prepared by free radical copolymerization of CB[6] methacrylate(CB[6]-MA),methacryloyl hydrazide(MH)and acrylamide(AM).The hydrogel with three-dimensional network structure was obtained by using hydrazide and aldehyde group to form unique dynamic covalency.The hydrogel has self-healing and p H response characteristics.In addition,CB[6] units in the copolymer have many non-covalent bonding sites.Therefore,the non-covalent complex PAM-CB[6]MA-MH·1-aminopyrene can be obtained by loading 1-aminopyrene,which can effectively detect Cu²⁺ in aqueous solution.In this paper,CB[6] was grafted onto the dynamic covalent repair material,which can further expand its application.(2)The copolymer was prepared by free radical polymerization with CB[6] methacrylate(CB[6]-MA),methacryloyl hydrazide(MH)and polyvinyl alcohol as monomers.The hydrogel has multiple shape memory effect by using reversible dynamic covalent bond formed by hydrazide group with aldehyde group,hydroxyl group with Boron oxygen group and reversible crystallization of polyvinyl alcohol chain.At the same time,the unique cavity structure of CB[6] interacts with the host and guest of carbonized polymer points(CPDs)to form supramolecular polymer hydrogels,which can effectively detect Fe³⁺ iron and Hg²⁺ ions.The new hydrogel prepared expands the application range of shape memory hydrogel and provides a new method for the detection of metal ions.(3)EDMB-BMA-MH-CB[6]MA films were prepared from CB[6] methacrylate(CB[6]-MA),ethylene glycol dimethacrylate(EDMB),butyl methacrylate(BMA)and methacryloyl hydrazide(MH)by free radical polymerization.The dynamic covalent bond between glyoxal and hydrazide group can be used to change the roughness of the film surface,which is beneficial to change its surface properties.The Glyoxal/DMB-BMA-MH-CB[6]MA films prepared have salt tolerance and Super lipophilic hydrophobicity.The film is simple to prepare and can effectively separate kerosene and water with high efficiency,multiple recycling and high stability,which provides a feasibility study idea for efficient selective oil-water separation membrane materials.