Method for preparing ionogel fiber based on halogenometallate ionic liquid

Abstract

The present invention provides a method for preparing an ionogel fiber based on a halogenometallate ionic liquid, including the following steps: dissolving a polymer in a good solvent to obtain a polymer solution; or dissolving polymer monomers in a good solvent, and carrying out a polymerization reaction under an action of an initiator to obtain a polymer solution; spinning the polymer solution in a poor solvent to obtain a polymer fiber; and immersing the polymer fiber in the halogenometallate ionic liquid for solvent exchange to obtain the ionogel fiber. The method provided by the present invention enhances the strength, strain, toughness, and energy dissipation under impact of fiber materials through a cyclic stretch-release training assisted by toughening with a halogenometallate ionic liquid, thereby preparing an ionogel fiber with high strength, high toughness, and high energy dissipation rate.

What is claimed is: 
     
         1 . A method for preparing an ionogel fiber based on a halogenometallate ionic liquid, comprising:
 (1) dissolving a polymer in a good solvent to obtain a polymer solution; or   dissolving polymer monomers in a good solvent, and carrying out a polymerization reaction under an action of an initiator to obtain a polymer solution;   (2) spinning the polymer solution obtained in Step (1) in a poor solvent to obtain a polymer fiber; and   (3) immersing the polymer fiber obtained in Step (2) in the halogenometallate ionic liquid for solvent exchange to obtain the ionogel fiber.   
     
     
         2 . The method according to  claim 1 , wherein in Step (1), the polymer is selected from the group consisting of polyvinyl alcohol, polyacrylamide, polyacrylic acid, poly (N, N-dimethylacrylamide), poly(ethyl methacrylate), poly(acryloyloxyethyltrimethylammonium chloride), poly(2-acrylamido-2-methyl-1-allylsulfonic acid), hydroxyethyl polyacrylate, polymethacrylic acid, polyvinyl sulfonic acid, poly(dimethylaminopropyl acrylamide), poly(2-carboxyethyl acrylate), poly(vinylphosphonic acid), poly(p-styrenesulfonic acid), polyurethane, polyacrylonitrile, polylactic acid, polycaprolactone and any combination thereof; the polymer monomer is selected from the group consisting of acrylamide, acrylic acid, N,N-dimethylacrylamide, ethyl methacrylate, acryloyloxyethyltrimethylammonium chloride, 2-acrylamido-2-methyl-1-allylsulfonic acid, hydroxyethyl acrylate, methacrylic acid, vinylsulfonic acid, dimethylaminopropyl acrylamide, 2-carboxyethyl acrylate, vinylphosphonic acid, p-styrenesulfonic acid, acrylonitrile and any combination thereof. 
     
     
         3 . The method according to  claim 1 , wherein in Step (1), the polymer has a molecular weight of 5 kDa-1 MDa. 
     
     
         4 . The method according to  claim 1 , wherein in Step (1), the good solvent is selected from the group consisting of water, glycerol, ethylene glycol, ethanol, acetonitrile, acetone, methanol, acetic acid, dimethyl sulfoxide, dimethylformamide and any combination thereof. 
     
     
         5 . The method according to  claim 1 , wherein in Step (1), the polymer and the good solvent have a mass ratio of 1:(0.1-10). 
     
     
         6 . The method according to  claim 1 , wherein in Step (2), the poor solvent is selected from the group consisting of ethanol, acetonitrile, acetone, methanol, acetic acid and any combination thereof. 
     
     
         7 . The method according to  claim 1 , wherein in Step (2), the poor solvent has a mass fraction of 5%-100%. 
     
     
         8 . The method according to  claim 1 , wherein in Step (3), the halogenometallate ionic liquid is selected from the group consisting of 1-butyl-3-methylimidazolium zinc bromide, 1-butyl-3-methylimidazolium calcium bromide, 1-butyl-3-methylimidazolium ferric bromide, 1-butyl-3-methylimidazolium copper bromide, 1-butyl-3-methylimidazolium zirconium bromide, 1-butyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazolium halide, 1-propyl-3-methylimidazolium halide and any combination thereof. 
     
     
         9 . The method according to  claim 1 , wherein in Step (3), the polymer fiber and the halogenometallate ionic liquid have a mass ratio of 1:(0.1-100). 
     
     
         10 . The method according to  claim 1 , further comprising cyclic stretch-release training after the solvent exchange in Step (3).